Radio frequency accelerator tuning method, terminal and medium

Abstract

The invention provides a tuning method of a radio frequency accelerator, a terminal and a medium, and the method comprises the steps: constructing a tuning coefficient based on a ratio between a first electric field impact factor and a second electric field impact factor; based on the frequency adjustment amount of the radio frequency accelerator, the insertion depth of the first tuner and the insertion depth of the second tuner are synchronously adjusted according to the tuning coefficient, so that the frequency of the radio frequency accelerator reaches the target frequency; according to the invention, the tuning process of the tuner can be accurately and conveniently realized, the tuning efficiency of the radio frequency accelerator is greatly improved, and the overall tunability of the accelerator is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of tuning, and in particular relates to a tuning method, a terminal and a computer storage medium of a radio frequency accelerator. Background Art

[0002] A radio frequency accelerator is a device that uses a radio frequency electric field to accelerate charged particles. It forms a radio frequency electric field in a specific accelerating structure, allowing charged particles to gain energy under the action of the electric field, thereby increasing their speed and kinetic energy. For existing radio frequency accelerators, there are often errors in the production and assembly process, resulting in a deviation between the actual value of the resonant frequency formed when the accelerator is running and the theoretical value.

[0003] In order to reduce the above-mentioned deviations existing in the radio frequency accelerator, a tuner is often provided in the existing radio frequency accelerator; the insertion depth of the tuner is adjusted to tune the resonant frequency in the accelerator cavity; however, for the radio frequency accelerator with a coupled acceleration structure, the tuners of each resonant cavity in the radio frequency accelerator will affect the frequency distribution and electric field distribution of the total cavity; specifically, when the insertion depth of the tuner of a single resonant cavity is adjusted, it will not only affect the resonant frequency of the total cavity, but also affect the uniformity of the electric field, causing the electric field flatness of the total cavity to deviate, so that the entire tuning process often requires multiple adjustments to the insertion depth of the tuner in each cavity, resulting in the entire tuning process not only being complicated but also having a low tuning efficiency, and requiring a lot of time and manpower.

[0004] Therefore, how to improve the tuning convenience and tuning efficiency of a radio frequency accelerator with a coupled acceleration structure has become a technical problem that needs to be solved in this field. Summary of the invention

[0005] In view of the above shortcomings in the prior art, the object of the present invention is to provide a tuning method, terminal and computer storage medium for a radio frequency accelerator, which are used to solve the problems of inconvenient tuning efficiency and tuning efficiency of the existing accelerator.

[0006] To achieve the above-mentioned object and other related objects, the present invention provides a tuning method of a radio frequency accelerator in a first aspect, wherein the radio frequency accelerator comprises a first resonant cavity and a second resonant cavity coupled to each other, and a corresponding tuner is provided in each of the resonant cavities; the tuning method of the radio frequency accelerator comprises:

[0007] When the unit tuning capabilities are the same, a first tuning radius corresponding to the first tuner and a second tuning radius corresponding to the second tuner are obtained; a first electric field influence factor of the first tuner under the first tuning radius is extracted, and a second electric field influence factor of the second tuner under the second tuning radius is extracted; a tuning coefficient is constructed based on the ratio between the first electric field influence factor and the second electric field influence factor; and the insertion depths of the first tuner and the second tuner are synchronously adjusted according to the tuning coefficient so that the frequency of the RF accelerator reaches the target frequency.

[0008] In one embodiment, the implementation of synchronously adjusting the insertion depths of the first tuner and the second tuner according to the tuning coefficient includes:

[0009] Acquire the unit tuning capability; acquire a total depth adjustment amount based on the frequency adjustment amount of the RF accelerator and the unit tuning capability; acquire a depth adjustment amount corresponding to the first tuner and a depth adjustment amount corresponding to the second tuner based on the tuning coefficient and in combination with the total depth adjustment amount, respectively, which are:

[0010] L1= Q* a / (a-1)*W

[0011] L2= Q * 1 / (a-1) * W

[0012] Among them, L1 is the depth adjustment amount corresponding to the first tuner; L2 is the depth adjustment amount corresponding to the second tuner; a is the tuning coefficient; W is the unit tuning capability; and Q is the frequency adjustment amount.

[0013] In one embodiment, the method for extracting the first electric field influence factor of the first tuner at the first tuning radius is the same as the method for extracting the first electric field influence factor of the first tuner at the first tuning radius, including:

[0014] One of the first tuner and the second tuner is used as the current tuner, and the insertion depth of the other tuner is fixed; for the current tuner, the electric field uniformity coefficient corresponding to the total cavity under several different insertion depths is obtained respectively; based on different insertion depths and corresponding electric field uniformity coefficients, a relationship curve between the electric field uniformity coefficient and the insertion depth under the current tuner is constructed by linear fitting; and the slope corresponding to the relationship curve is extracted as the electric field influencing factor corresponding to the current tuner.

[0015] In one embodiment, the method for obtaining the electric field uniformity coefficient includes:

[0016] The voltage distribution corresponding to each of the resonant cavities is obtained; based on the voltage distribution of each of the resonant cavities, a coefficient characterizing the difference in voltage distribution between the resonant cavities is constructed as an electric field uniformity coefficient.

[0017] In one embodiment, a method for acquiring the first tuning radius and the second tuning radius includes:

[0018] The unit tuning capabilities corresponding to the first tuner and the second tuner at the same reference radius are respectively obtained; when it is detected that the unit tuning capabilities of the two are different, the tuning radius of the tuner is adjusted so that the unit tuning capabilities corresponding to the first tuner and the second tuner are the same; wherein the reference radius is a pre-set tuner radius.

[0019] In one embodiment, the tuning radius of the tuner is adjusted by:

[0020] Take one of the first tuner and the second tuner as the current tuner; obtain the unit tuning capacity of the other tuner under the current radius; based on the unit tuning capacity and in combination with the mapping relationship between the unit tuning capacity corresponding to the current tuner and the tuning radius, extract the radius corresponding to the current tuner when the unit tuning capacity is reached as the tuning radius of the current tuner; wherein the mapping relationship is used to characterize the changing characteristics of the unit tuning capacity of the tuner as the tuning radius changes.

[0021] In one embodiment, the method for obtaining the mapping relationship includes:

[0022] The unit tuning capabilities corresponding to the current tuner under several different tuning radii are obtained; based on different tuning radii and the unit tuning capabilities corresponding to the tuning radii, a fitting curve between the tuning radius and the unit tuning capabilities is constructed by linear fitting as the mapping relationship.

[0023] In one embodiment, the method for obtaining the reference radius includes:

[0024] A number of different tuning radii are set; under different tuning radii, a sixth relationship curve between the total cavity frequency and the tuner insertion depth is obtained, and a seventh relationship curve between the total cavity Q value and the tuner insertion depth is obtained; from the sixth relationship curve and the seventh relationship curve, the reference frequency and reference Q value corresponding to different tuning radii under the same reference depth are extracted; wherein the reference depth is any depth value not greater than the maximum insertion depth; for the same tuning radius, the reference frequency and reference Q value corresponding to the tuning radius are integrated to obtain a comprehensive value corresponding to the tuning radius; the maximum value among the comprehensive values ​​corresponding to each tuning radius is extracted, and the tuning radius corresponding to the maximum value is used as the reference radius.

[0025] In one embodiment, the method for obtaining the maximum insertion depth includes:

[0026] Obtain the sixth relationship curve between the insertion depth and frequency of the tuner; in each of the sixth relationship curves, extract the turning point of the curve slope change, and use the insertion depth corresponding to the turning point of the change as the maximum insertion depth corresponding to the sixth relationship curve; wherein the turning point of the change is the curve point corresponding to the first time the curve slope is less than the slope threshold during the process of the curve slope changing from large to small.

[0027] In one embodiment, the method for acquiring the unit tuning capability includes:

[0028] A tuner is used as the current tuner, and the insertion depth of another tuner is fixed; for the current tuner, the frequencies corresponding to the total cavity at several different insertion depths are obtained respectively; based on different insertion depths and corresponding frequencies, a relationship curve between the frequency and the insertion depth is constructed by linear fitting; and the slope corresponding to the relationship curve is extracted as the unit tuning capability corresponding to the current tuner.

[0029] The present invention provides a terminal in a second aspect, including a processor and a memory, wherein the memory is communicatively connected to the processor; the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the terminal performs any of the above-described methods for tuning a radio frequency accelerator.

[0030] The present invention provides a computer storage medium in a third aspect, on which a computer program is stored, characterized in that when the program is executed by a processor, the tuning method of the radio frequency accelerator as described above is implemented.

[0031] As described above, the tuning method, terminal and computer storage medium of the radio frequency accelerator provided by the present invention, when the unit tuning capabilities corresponding to the first tuner and the second tuner are the same, extract the first electric field influence factor corresponding to the first tuner, and extract the second electric field influence factor corresponding to the second tuner, so as to construct a tuning coefficient based on the first electric field influence factor and the second electric field influence factor; and, based on the tuning coefficient, perform synchronous depth adjustment on the two tuners to achieve the target frequency of the radio frequency accelerator, so that the tuning process of the tuner can be accurately and conveniently realized, which greatly improves the tuning efficiency of the radio frequency accelerator and effectively improves the overall tuning performance of the accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shown is a schematic structural diagram of a transverse cross section of an accelerator in an embodiment of the present invention;

[0033] Figure 2 Shown is a schematic structural diagram of a longitudinal cross section of an accelerator in an embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram showing a flow chart of a tuning method of a radio frequency accelerator in one embodiment of the present invention;

[0035] Figure 4 Shown is a flow chart of a method for obtaining the first tuning radius and the second tuning radius in one embodiment of the present invention;

[0036] Figure 5 It is a schematic flow chart of another embodiment of a method for obtaining the first tuning radius and the second tuning radius in the present invention;

[0037] Figure 6 An example diagram showing the unit tuning capabilities of the first tuner and the second tuner at the same tuning radius (45 mm) in the present invention;

[0038] Figure 7 An example diagram showing a first relationship curve between a first tuning radius and a unit tuning capability of the first tuner in the present invention;

[0039] Figure 8 It is a flowchart showing the execution method of step S200 in one embodiment of the present invention;

[0040] Fig. 9 It is a schematic diagram showing the fourth relationship curve and the fifth relationship curve in one embodiment of the present invention;

[0041] Fig.10 It is a flowchart showing the execution method of step S300 in one embodiment of the present invention;

[0042] Fig.11 Shown is a schematic flow chart of a method for obtaining the reference radius in one embodiment of the present invention;

[0043] Fig.12 It is a schematic diagram showing the sixth relationship curve of the present invention in one embodiment;

[0044] Fig.13 It is a schematic diagram showing the seventh relationship curve in one embodiment of the present invention;

[0045] Fig.14 It is a schematic flow chart showing a method for obtaining the maximum insertion depth in one embodiment of the present invention;

[0046] Fig.15 It is a schematic diagram showing a flow chart of a method for extracting a change turning point in one embodiment of the present invention;

[0047] Fig.16 Shown is a schematic diagram of the structure of the terminal in one embodiment of the present invention.

[0048] Description of Reference Numerals

[0049] 10 - first resonant cavity; 20 - second resonant cavity; 30 - coupling unit; 40 - tuning channel; 50 - electronic terminal; 51 - processor; 52 - memory; 53 - network interface; 54 - user interface; 55 - bus system; 521 - operating system; 522 - application program. DETAILED DESCRIPTION

[0050] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0051] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0052] The Q value, or the quality factor of the accelerator, is a dimensionless parameter used to measure the loss of the resonant circuit.

[0053] For a radio frequency accelerator with an uncoupled acceleration structure, a change in the insertion depth of the tuner will not cause a significant change in the electric field distribution in the total cavity; however, for a radio frequency accelerator with a coupled acceleration structure, when the insertion depth of the tuner changes, the local frequency change in the front and rear cavities in the coupled structure will cause the electric field distribution in the front and rear cavities to change, thereby distorting the field flatness; therefore, when using the existing radio frequency accelerator tuning method to perform frequency tuning processing, it is necessary to adjust the insertion depth of the tuner in the radio frequency accelerator multiple times, resulting in problems such as the entire tuning process being complicated and inefficient. The tuning method, terminal and computer storage medium of the radio frequency accelerator provided in the present application construct a tuning coefficient for characterizing the difference between the intensity of the influence of the first tuner and the second tuner on the electric field distribution in the total cavity, and based on the tuning coefficient, perform synchronous depth adjustment on the two tuners to achieve the target frequency of the radio frequency accelerator, thereby accurately and conveniently realizing the tuning process of the tuner, greatly improving the tuning efficiency of the accelerator.

[0054] The radio frequency accelerator (hereinafter referred to as “accelerator”) is an accelerator using a coupled acceleration structure. The radio frequency accelerator includes a first resonant cavity and a second resonant cavity coupled to each other, and a corresponding tuner is provided in each of the resonant cavities.

[0055] To facilitate understanding of the present technical solution, the structure of the accelerator will be described below. Figure 1 and 2 , which is a schematic diagram of the structure of the accelerator described in the embodiment of the present application; wherein, Figure 1 is a schematic structural diagram of a transverse cross section (parallel to the beam direction) of the accelerator; Figure 2 It is a schematic structural diagram of the longitudinal cross section (perpendicular to the beam direction) of the accelerator.

[0056] like Figure 1 and Figure 2 As shown, the accelerator includes: a first resonant cavity (hereinafter referred to as the "first cavity") 10, a second resonant cavity (hereinafter referred to as the "second cavity") 20 and a coupling unit 30; the coupling unit 30 is arranged between the first cavity 10 and the second cavity 20, and the two ends are respectively coupled to the first cavity 10 and the second cavity 20 to form a total acceleration cavity (hereinafter referred to as the "total cavity").

[0057] The coupling unit 30 is coaxially arranged with the first cavity 10 and the second cavity 20 to form a total cavity for accelerating the particle beam.

[0058] In the shells of the first cavity 10 and the second cavity 20, an even number of tuning channels 40 are provided in the circumferential direction; each tuning channel 40 is radially distributed and two tuning channels 40 arranged opposite to each other form a tuning channel group to achieve balanced adjustment of the frequency distribution in the cavity; a tuner (not marked) is provided in each tuning channel 40, that is, a first tuner is inserted in the tuning channel of the first cavity 10, and a second tuner is inserted in the tuning channel of the second cavity 20; and in the first cavity 10, the insertion depth of each of the first tuners is the same, and in the second cavity 20, the insertion depth of each of the second tuners is also the same, thereby effectively improving the tuning efficiency of the tuner corresponding to each cavity.

[0059] It should be noted that the circumferential arrangement of the tuning channels in the first cavity and the circumferential arrangement of the tuning channels in the second cavity may be the same or different, and is not specifically limited here.

[0060] See also Figure 3 , which is a schematic flow chart of a tuning method of the radio frequency accelerator provided by the present invention in one embodiment; Figure 3 As shown, the method comprises the following steps:

[0061] S100, acquiring a first tuning radius corresponding to the first tuner and a second tuning radius corresponding to the second tuner when the unit tuning capabilities are the same;

[0062] In the present application, the first tuner has a first unit tuning capacity when the tuner radius reaches a first tuning radius; similarly, the second tuner has a second unit tuning capacity when the tuner radius reaches a second tuning radius, and the first unit tuning capacity is the same as the second unit tuning capacity.

[0063] Among them, the unit tuning capacity is the influence of the insertion depth change of the single-side tuner on the frequency change in the total cavity of the accelerator (the insertion depth of the tuner on the other side is fixed); that is, the unit tuning capacity of the first tuner is, when the insertion depth of the second tuner is fixed at an insertion depth, the influence of the insertion depth change of the first tuner on the frequency change in the total cavity; similarly, the unit tuning capacity of the second tuner is, when the insertion depth of the first tuner is fixed at an insertion depth, the influence of the insertion depth change of the second tuner on the frequency change in the total cavity.

[0064] In an optional embodiment, the first tuning radius and the second tuning radius are obtained as follows: Figure 4 As shown, including:

[0065] S101, determining unit tuning capability;

[0066] Exemplarily, the unit tuning capability is a preset value;

[0067] S102, based on the unit tuning capability and in combination with a first mapping relationship between the unit tuning capability corresponding to the first tuner and a tuning radius, extracting a radius corresponding to the first tuner when the unit tuning capability is reached as a first tuning radius of the first tuner;

[0068] S103, based on the unit tuning capability and in combination with a second mapping relationship between the unit tuning capability corresponding to the second tuner and a tuning radius, extract the radius corresponding to the second tuner when the unit tuning capability is reached as a second tuning radius of the second tuner.

[0069] The mapping relationship is used to characterize the variation characteristics of the unit tuning capability of the tuner with the variation of the tuning radius, including but not limited to a mapping table or a relationship curve.

[0070] In another optional embodiment, the first tuning radius and the second tuning radius are obtained as follows: Figure 5 As shown, including:

[0071] S101', respectively obtaining corresponding unit tuning capabilities of the first tuner and the second tuner at the same reference radius;

[0072] Wherein, the reference radius is a preset tuner radius;

[0073] S102', detecting whether the unit tuning capabilities of the two are the same, and if it is detected that they are different, adjusting the tuning radius of the tuner so that the unit tuning capabilities corresponding to the first tuner and the second tuner are the same;

[0074] Specifically, when it is detected that the unit tuning capabilities of the first tuner and the second tuner are different, the unit tuning capability of the second tuner at the current radius is obtained; based on the unit tuning capability, combined with a first mapping relationship between the unit tuning capability corresponding to the first tuner and the tuning radius, the radius corresponding to the first tuner when the unit tuning capability is reached is extracted as the first tuning radius of the first tuner;

[0075] Alternatively, obtain the unit tuning capability of the first tuner at the current radius; based on the unit tuning capability, combined with a second mapping relationship between the unit tuning capability corresponding to the second tuner and the tuning radius, extract the radius corresponding to the second tuner when the unit tuning capability is reached as the second tuning radius of the second tuner.

[0076] In an optional embodiment, the mapping relationship is a relationship curve, that is, the first mapping relationship is a first relationship curve, and the second mapping relationship is a second relationship curve; taking the first relationship curve corresponding to the first tuner as an example, the method for obtaining the relationship curve includes:

[0077] fixing the radius of the second tuner;

[0078] Obtaining the unit tuning capabilities corresponding to the first tuner under a plurality of different tuning radii;

[0079] Based on different tuning radii and the unit tuning capabilities corresponding to the tuning radii, a linear fitting method is adopted to construct a fitting curve between the two as the first relationship curve.

[0080] In an optional embodiment, for a single tuner, the corresponding method for obtaining the unit tuning capability includes:

[0081] The insertion depth in the other tuner is fixed;

[0082] Using a simulation method, the cavity frequency of the accelerator total cavity corresponding to the current tuner at several different insertion depths is obtained; based on the different insertion depths and the corresponding cavity frequencies, a third relationship curve between the cavity frequency and the insertion depth is constructed by a linear fitting method;

[0083] The slope corresponding to the third relationship curve is extracted, and the slope is used as the unit tuning capability corresponding to the current tuner.

[0084] Among them, the simulation method includes a method of using a simulation platform to simulate and calculate the accelerator; for a single insertion depth, a simulation method is used to obtain the cavity frequency of the current tuner at the insertion depth, that is, the insertion depth of the tuner is input into the simulation platform, and the simulation platform is used to simulate and calculate the frequency of the total cavity of the accelerator at the insertion depth.

[0085] Exemplarily, the simulation platform is CST software.

[0086] For example, the unit tuning capabilities of the first tuner and the second tuner at the same tuning radius (45 mm) are as follows: Figure 6 As shown; wherein the unit tuning capability of the first tuner is the slope of the third relationship curve corresponding to the first tuner, which is 11.6kHz / mm; the unit tuning capability of the second tuner is the slope of the third relationship curve corresponding to the second tuner, which is 17.3kHz / mm.

[0087] When it is detected that the unit tuning capabilities of the first tuner and the second tuner are different, the tuning radius of the second tuner is fixed to 45 mm, and a first relationship curve between the first tuning radius of the first tuner and the unit tuning capability is constructed as shown in FIG. Figure 7 shown by Figure 7 As shown, as the first tuning radius increases, the corresponding unit tuning capability also gradually increases; when the radius is 51.3 mm, the corresponding unit tuning capability is 17.3kHz / mm, that is, when the radius of the second tuner is 45mm and the first tuning radius of the first tuner is 51.3mm, the corresponding unit tuning capabilities of the two are the same.

[0088] S103', when the unit tuning capabilities of the two are the same, extracting the current tuning radius of the first tuner as the first tuning radius; and extracting the current tuning radius of the second tuner as the second tuning radius.

[0089] It should be noted that, in the present application, the first tuning radius of the first tuner and the second tuning radius of the second tuner are the radius values ​​corresponding to each tuner when the unit tuning capabilities of the two tuners are the same; based on this, the first tuning radius of the first tuner and the second tuning radius of the second tuner can have multiple sets of numerical correspondences, rather than being limited to only one set of numerical correspondences, that is, when the first tuning radius is R11, the second tuning radius is R21, when the first tuning radius is R12, the second tuning radius is R22, and so on.

[0090] S200, extracting a first electric field influence factor of the first tuner at a first tuning radius, and extracting a second electric field influence factor of the second tuner at a second tuning radius; setting a ratio between the first electric field influence factor and the second electric field influence factor as a tuning coefficient;

[0091] Among them, the electric field influence factor is the influence intensity of the insertion depth change of the single-side tuner on the electric field uniformity in the total cavity of the accelerator (the insertion depth of the tuner on the other side is fixed); that is, the first electric field influence factor is the influence intensity of the insertion depth change of the first tuner on the electric field uniformity in the total cavity (the insertion depth of the second tuner is fixed); similarly, the second electric field influence factor is the influence intensity of the insertion depth change of the second tuner on the electric field uniformity in the total cavity (the insertion depth of the first tuner is fixed).

[0092] Accordingly, the tuning coefficient is used to characterize the difference between the influence strength of the first tuner and the second tuner on the electric field distribution in the overall cavity.

[0093] In this embodiment, the electric field uniformity is used to characterize the uniformity / difference of the electric field characteristics between the resonant cavities; the electric field characteristics include but are not limited to electric field physical distribution characteristics such as voltage distribution and electric field intensity distribution.

[0094] Specifically, the electric field uniformity is characterized by a pre-constructed electric field uniformity coefficient, and the execution method of step S200 is as follows: Figure 8 As shown, including:

[0095] S201, taking one of the first tuner and the second tuner as a current tuner, and fixing an insertion depth of the other tuner;

[0096] S202, for the current tuner, respectively obtaining electric field uniformity coefficients corresponding to the total cavity at a plurality of different insertion depths;

[0097] S203, constructing a relationship curve between the electric field uniformity coefficient and the insertion depth under the current tuner by using a linear fitting method based on different insertion depths and corresponding electric field uniformity coefficients;

[0098] S204: extracting the slope corresponding to the relationship curve as the electric field influence factor corresponding to the current tuner.

[0099] More specifically, the first tuner is used as the current tuner, and the insertion depth of the second tuner is fixed; for the first tuner, the electric field uniformity coefficient corresponding to the total cavity under several different insertion depths is obtained respectively; based on the different insertion depths and the corresponding electric field uniformity coefficients, a fourth relationship curve between the electric field uniformity coefficient and the insertion depth under the first tuner is constructed by linear fitting; and the slope corresponding to the fourth relationship curve is extracted as the first electric field influencing factor;

[0100] Similarly, the second tuner is used as the current tuner, and the insertion depth of the first tuner is fixed; for the second tuner, the electric field uniformity coefficient corresponding to the total cavity at several different insertion depths is obtained respectively; based on the different insertion depths and the corresponding electric field uniformity coefficients, a fifth relationship curve between the electric field uniformity coefficient and the insertion depth of the second tuner is constructed by linear fitting; and the slope corresponding to the fifth relationship curve is extracted as the second electric field influencing factor.

[0101] After obtaining the first electric field influence factor and the second electric field influence factor, a ratio between the two is set as a tuning coefficient.

[0102] Exemplarily, the insertion depth of the second tuner is fixed to 75 mm, and the electric field uniformity coefficient corresponding to different insertion depths is extracted by adjusting the insertion depth of the first tuner to construct a fourth relationship curve of the insertion depth of the first tuner to the electric field uniformity coefficient; and similarly, the insertion depth of the first tuner is fixed to 75 mm, and the electric field uniformity coefficient corresponding to different insertion depths is extracted by adjusting the insertion depth of the second tuner to construct a fifth relationship curve of the insertion depth of the second tuner to the electric field uniformity coefficient; the constructed fourth relationship curve and fifth relationship curve are specifically as follows Fig. 9 shown by Fig. 9 It can be seen that the first electric field influence factor corresponding to the fourth relationship curve is 0.004, and the second electric field influence factor corresponding to the fifth relationship curve is 0.0048; based on the first electric field influence factor and the second electric field influence factor, the tuning coefficient is determined to be 1:1.2.

[0103] S300: Perform synchronous adjustment on the insertion depths of the first tuner and the second tuner according to the tuning coefficient, so that the frequency of the accelerator reaches a target frequency.

[0104] Specifically, obtaining a first insertion depth of the first tuner at the current time, and obtaining a second insertion depth of the second tuner at the current time;

[0105] The insertion depth values ​​of the first insertion depth and the second insertion depth are adjusted; during the adjustment process, the ratio between the adjustment amount of the first insertion depth and the adjustment amount of the second insertion depth is made the same as the value of the tuning coefficient, so that the depth adjustment process of the first tuner and the second tuner is in line with the synchronous adjustment of the tuning coefficient.

[0106] Exemplarily, when the tuning coefficient is 1:1.2, when the insertion depth of the second tuner is reduced by 1 mm, the insertion depth of the first tuner is correspondingly increased by 1.2 mm to ensure that the electric field uniformity of the cavity does not change due to the change of the tuner insertion depth during the frequency adjustment process.

[0107] The tuning method of the radio frequency accelerator provided in this embodiment constructs a tuning coefficient that can reflect the difference in the intensity of the influence of the first tuner and the second tuner on the electric field distribution in the total cavity, and performs synchronous adjustment on the insertion depths of the first tuner and the second tuner based on the tuning coefficient, thereby achieving the adjustment of the total cavity frequency of the accelerator while ensuring that the electric field uniformity in the total cavity of the accelerator remains unchanged, thereby greatly reducing the complexity of the tuning process of the radio frequency accelerator of the coupling structure and effectively improving the tuning efficiency.

[0108] In order to improve the efficiency of accelerator frequency adjustment and enable the accelerator frequency to be adjusted to the target frequency more quickly and accurately, in some optional implementations, the step S300 is executed as follows: Fig.10 As shown, including:

[0109] S301, obtaining a unit tuning capability of a tuner and a frequency adjustment amount of an accelerator;

[0110] The unit tuning capability may be the unit tuning capability corresponding to the first tuner, or may be the unit tuning capability corresponding to the second tuner, and both are the same;

[0111] S302: Based on the frequency adjustment amount of the accelerator, in combination with the unit tuning capability and the tuning coefficient, obtain a depth adjustment amount corresponding to the first tuner and a depth adjustment amount corresponding to the second tuner.

[0112] Specifically, after determining the unit tuning capability, the total depth adjustment is obtained based on the frequency adjustment amount of the accelerator and the unit tuning capability; based on the tuning coefficient and in combination with the total depth adjustment, the depth adjustment amount L1 corresponding to the first tuner and the depth adjustment amount L2 corresponding to the second tuner are respectively obtained, which are:

[0113] L1= M* a / (a-1)*W

[0114] L2= M * 1 / (a-1) * W

[0115] Wherein, L1 is the depth adjustment amount corresponding to the first tuner; L2 is the depth adjustment amount corresponding to the second tuner; a is the tuning coefficient; W is the unit tuning capability; and M is the frequency adjustment amount of the accelerator.

[0116] This embodiment obtains the unit tuning capability of the tuner, and based on the unit tuning capability, the tuning coefficient, and the frequency adjustment amount of the accelerator to be adjusted, the depth adjustment amount corresponding to each tuner can be quickly obtained according to the mathematical relationship between the three, thereby effectively improving the adjustment efficiency of the target frequency.

[0117] It should be noted that, in another embodiment, the step S300 may also adopt a gradual approach adjustment method, that is, when the step S300 is executed, it may also:

[0118] Setting a first depth adjustment step corresponding to the first tuner, and setting a second depth adjustment step corresponding to the second tuner; wherein a ratio between the first depth adjustment step and the second depth adjustment step is the same as the value of the tuning coefficient;

[0119] Based on the first depth adjustment step, adjusting a first insertion depth of the first tuner to obtain a new first insertion depth; and based on the second depth adjustment step, adjusting a second insertion depth of the second tuner to obtain a new second insertion depth;

[0120] The current frequency of the accelerator main cavity is obtained, and it is detected whether the frequency reaches the target frequency. If so, the frequency adjustment process is exited; if not, step S300 is continued; and the process is repeated to make the frequency of the accelerator main cavity reach the target frequency.

[0121] It should be noted that, in this embodiment, before adjusting the insertion depth of the tuner, it is necessary to determine the tuner whose insertion depth is to be increased and the tuner whose insertion depth is to be reduced according to the positive or negative nature of the frequency adjustment amount; that is, since the depth adjustment amount of the first tuner is positively correlated with the total cavity frequency, and the depth adjustment amount of the second tuner is negatively correlated with the total cavity frequency, when the target frequency is greater than the current frequency (the frequency adjustment amount is a positive value), the first tuner is set as the tuner whose insertion depth is to be increased, and the second tuner is set as the tuner whose insertion depth is to be reduced; conversely, when the target frequency is less than the current frequency (the frequency adjustment amount is a negative value), the second tuner is set as the tuner whose insertion depth is to be increased, and the first tuner is set as the tuner whose insertion depth is to be reduced.

[0122] Since the electric field influence factor is closely related to the electric field uniformity in the accelerator cavity, the accuracy of obtaining the electric field uniformity will directly affect the accuracy of the electric field influence factor. In order to more efficiently and accurately evaluate the electric field uniformity of the resonant cavity, in some optional embodiments, the electric field uniformity coefficient is obtained in the following manner:

[0123] Obtaining voltage distribution corresponding to each of the resonant cavities;

[0124] Based on the voltage distribution of each of the resonant cavities, a coefficient characterizing the difference in voltage distribution between the resonant cavities is constructed as an electric field uniformity coefficient.

[0125] In an optional implementation, the electric field uniformity coefficient is a ratio of the voltage distributions between the resonant cavities, so as to characterize the degree of voltage difference between the resonant cavities; illustratively, the expression of the electric field uniformity coefficient is:

[0126]

[0127] in, represents the electric field uniformity coefficient, represents the voltage distribution of the first resonant cavity C1, represents the voltage distribution of the second resonant cavity C2. The closer the value is to 1, the smaller the difference in voltage distribution of the resonant cavities is, that is, the more uniform the electric field distribution is; on the contrary, The greater the difference between the value and 1, the greater the difference in voltage distribution of the resonant cavities, that is, the worse the uniformity of the electric field distribution.

[0128] In another optional embodiment, the electric field uniformity is the difference in voltage distribution between the resonant cavities, so as to characterize the degree of voltage difference between the resonant cavities; illustratively, the expression of the electric field uniformity coefficient is:

[0129]

[0130] The closer the value is to 0, the smaller the difference in voltage distribution of the resonant cavities is, that is, the more uniform the distribution of electric field characteristics is; on the contrary, The greater the difference between the value and 0, the greater the difference in voltage distribution of the resonant cavities, that is, the worse the uniformity of the electric field characteristic distribution.

[0131] It should be noted that the voltage distribution mentioned above is a characteristic parameter used to characterize the concentration trend of voltage values ​​in the cavity; illustratively, the voltage distribution includes the voltage mean, median or other existing characteristic values ​​that characterize the concentration trend of values.

[0132] A plurality of accelerating gaps are arranged in a single resonant cavity. In order to more accurately and objectively characterize the voltage distribution corresponding to each resonant cavity, the voltage distribution of the resonant cavity is obtained by:

[0133] Based on the structural parameters corresponding to each accelerating gap, obtaining the accelerating voltage corresponding to each accelerating gap;

[0134] Specifically, the structural parameters corresponding to each acceleration gap in the resonant cavity are obtained; the structural parameters corresponding to each acceleration gap are input into an accelerator simulation platform, and the structural parameters are simulated and calculated on the simulation platform to obtain an acceleration voltage corresponding to the acceleration gap; illustratively, the simulation platform is CST software.

[0135] The structural parameters corresponding to the acceleration gap include drift tube length, acceleration gap length, acceleration cycle length, cavity radius, etc.

[0136] The accelerating voltages corresponding to the accelerating gaps in the resonant cavity are integrated to obtain the voltage distribution of the resonant cavity.

[0137] Specifically, for a single resonant cavity, after obtaining the acceleration voltages corresponding to the acceleration gaps in the resonant cavity, the acceleration voltages are averaged, and the voltage average is used as the voltage distribution corresponding to the current resonant cavity, that is:

[0138]

[0139] in, represents the average gap voltage of the I-th resonant cavity, represents the number of accelerating gaps in the I-th resonant cavity, Represents the voltage value of the i-th acceleration gap.

[0140] It should be noted that the above content of the present application exemplifies the specific method of obtaining the voltage distribution corresponding to each resonant cavity, but is not limited to this. As long as the voltage distribution status for characterizing each resonant cavity can be obtained, it can be obtained by direct calculation, for example.

[0141] In an accelerator, the tuning radius of the tuner will affect the accelerator's physical field parameters such as the frequency field distribution, electric field distribution and cavity Q value of the accelerator's total cavity; specifically, as the radius of the tuner increases, the cavity frequency will increase, while the cavity Q value will decrease, and vice versa.

[0142] Based on this, in the process of accelerator tuning, in order to comprehensively consider the influence of each tuner radius on physical field parameters such as cavity frequency and cavity Q, so that the accelerator has a better working state during the tuning process, in a specific embodiment, the method for obtaining the reference radius is as follows: Fig.11 As shown, including:

[0143] S801, setting a number of different tuning radii;

[0144] S802, obtaining a sixth relationship curve between the total cavity frequency and the tuner insertion depth under different tuning radii, and obtaining a seventh relationship curve between the total cavity Q value and the tuner insertion depth;

[0145] The sixth relationship curve is used to characterize the distribution characteristics of the frequency of the accelerator total cavity as the tuner insertion depth changes; the seventh relationship curve is used to characterize the distribution characteristics of the Q value of the accelerator total cavity as the tuner insertion depth changes;

[0146] In this embodiment, the tuner includes a first tuner and a second tuner, that is, the first tuner and the second tuner perform the following same operations, including:

[0147] For the tuner corresponding to a single tuning radius, the frequency corresponding to the accelerator total cavity at different insertion depths is obtained; based on the different insertion depths and the corresponding total cavity frequencies, a linear fitting method is used to construct a sixth relationship curve between the total cavity frequency and the tuner insertion depth as the sixth relationship curve corresponding to the tuning radius.

[0148] Similarly, for the tuner corresponding to a single tuning radius, the Q value corresponding to the accelerator total cavity under different insertion depths is obtained; based on the different insertion depths and the corresponding total cavity Q value, a linear fitting method is used to construct a seventh relationship curve between the total cavity Q value and the tuner insertion depth, as the seventh relationship curve corresponding to the tuning radius.

[0149] S803, extracting reference frequencies and reference Q values ​​corresponding to different tuning radii at the same reference depth based on the sixth relationship curve and the seventh relationship curve;

[0150] The reference depth is any depth value within the maximum insertion depth range of the tuner; and the maximum insertion depth is the depth corresponding to the maximum effect of the tuner insertion depth on the total cavity frequency.

[0151] In some optional implementations, the reference depth is half of the maximum tuning depth corresponding to the tuner, that is, when the maximum tuning depth is 150 mm, the reference depth is 75 mm.

[0152] S804, for the same tuning radius, a weighted method is used to integrate the reference frequency and reference Q value corresponding to the tuning radius to obtain a comprehensive value corresponding to the tuning radius; the maximum value among the comprehensive values ​​corresponding to each tuning radius is extracted, and the tuning radius corresponding to the maximum value is used as the reference radius.

[0153] Exemplarily, the tuning radius r is set to 35 mm, 40 mm, 45 mm and 50 mm respectively; for each tuning radius, a sixth relationship curve corresponding to the tuning radius is constructed as follows: Fig.12 As shown, the seventh relationship curve corresponding to the tuning radius is constructed as shown Fig.13 As shown; when the insertion depth is 75mm, the reference frequencies corresponding to different tuning radii are obtained respectively, as follows: when the tuning radius r is 35mm, the corresponding reference frequency is 166.197MHz, and the Q value is 9994.069; when the tuning radius r is 40mm, the corresponding reference frequency is 166.59MHz, and the Q value is 9892.96; when the tuning radius r is 45mm, the corresponding reference frequency is 167.027MHz, and the Q value is 9817.7; when the tuning radius r is 50mm, the corresponding reference frequency is 167.489MHz, and the Q value is 9742.39.

[0154] For different tuning radii, the corresponding reference frequency and reference Q value are weighted and integrated to obtain the integrated value corresponding to the different tuning radii. Based on this, the reference radius is determined to be 45 mm.

[0155] This embodiment comprehensively evaluates the reference frequencies and reference Q values ​​corresponding to different tuning radii, and determines the tuning radius with the best comprehensive evaluation result among the preset tuning radii based on the comprehensive evaluation result, thereby effectively improving the acquisition effect and efficiency of the reference radius.

[0156] In order to obtain the maximum insertion depth more quickly and accurately, in an optional embodiment, the maximum insertion depth is obtained in a manner such as: Fig.14 As shown, including:

[0157] S901, obtaining a sixth relationship curve between the insertion depth and frequency of the tuner;

[0158] In this embodiment, the tuner includes a first tuner and a second tuner, that is, the same operation is performed on the first tuner and the second tuner.

[0159] Exemplarily, the tuning radius is set to 35 mm, 40 mm, 45 mm and 50 mm respectively; for a single tuning radius, the frequencies corresponding to different insertion depths are obtained; based on the different insertion depths and the corresponding frequencies, a linear distribution curve between the two is constructed as the sixth relationship curve corresponding to the current tuning radius; this step is performed for each of the tuning radii to obtain the sixth relationship curve corresponding to the different tuning radii.

[0160] S902, extracting a change turning point of the slope of each of the sixth relationship curves, and using the insertion depth corresponding to the change turning point as the maximum insertion depth corresponding to the sixth relationship curve;

[0161] The turning point is a curve point corresponding to when the slope of the curve is less than the slope threshold for the first time during the process of the slope of the curve changing from large to small.

[0162] Specifically, the method for extracting the change turning point is as follows: Fig.15 As shown, including:

[0163] S902A, extracting the slope corresponding to each insertion depth in the sixth relationship curve;

[0164] Specifically, based on a preset sampling interval, the insertion depth range of the tuner is sampled to obtain sampling points of the insertion depth; in the sixth relationship curve, the total cavity frequency corresponding to each sampling point is extracted; based on the insertion depth value corresponding to each sampling point and the corresponding total cavity frequency, the slope of the curve corresponding to the sampling point is calculated as the slope corresponding to the corresponding insertion depth.

[0165] S902B, performing slope change detection based on the slopes corresponding to the respective insertion depths to extract the turning points of the slope changes;

[0166] Specifically, for each sampling point in the curve segment where the curve slope changes from large to small, it is detected in turn whether the curve slope corresponding to each sampling point is less than the slope threshold; when it is detected for the first time that the curve slope is less than the slope threshold, the sampling point is used as the turning point of the change.

[0167] In a specific implementation, the slope threshold is set to 0, and corresponding sixth relationship curves are constructed for tuners with tuning radius r of 35 mm, 40 mm, 45 mm and 50 mm, respectively; the constructed sixth relationship curves refer to Fig.12 ;like Fig.10 It can be seen that when the tuner is inserted to a depth of 150 mm, the curve frequency is less than or equal to 0. Based on this, the maximum insertion depth is obtained to be 150 mm.

[0168] It should be noted that, in each embodiment of the present application, the slope corresponding to each relationship curve is the slope corresponding to the fitted oblique line of the corresponding relationship curve after linear fitting; illustratively, the slope corresponding to the first relationship curve is the slope corresponding to the first fitted oblique line obtained after performing the first linear fitting on the first relationship curve; and so on. Those skilled in the art can know that, as described above, the slope can also be the slope of the oblique line constructed by the two end points in the corresponding relationship curve, or it can be the mean or median of the tangent slopes corresponding to each curve point in the corresponding relationship curve.

[0169] Based on the same technical concept, the tuning method of the radio frequency accelerator provided in the above embodiment of the present invention can be implemented on the terminal side or the server side.

[0170] See also Fig.10 , is an optional hardware structure diagram of an electronic terminal 50 provided in an embodiment of the present invention. The electronic terminal 50 may be a live broadcast machine, a camera, a mobile phone, a computer device, a tablet device, a personal digital processing device, a factory background processing device, etc. that integrates photo / video functions. The electronic terminal 50 includes: at least one processor 51, a memory 52, at least one network interface 53 and a user interface 54. The various components in the device are coupled together through a bus system 55. It can be understood that the bus system 55 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 55 also includes a power bus, a control bus and a status signal bus.

[0171] The user interface 54 may include a display, a keyboard, a mouse, a trackball, a click gun, keys, buttons, a touch pad or a touch screen.

[0172] It is understood that the memory 52 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM). The memory described in the embodiments of the present invention is intended to include but is not limited to these and any other suitable categories of memory.

[0173] The memory 52 in the embodiment of the present invention is used to store various categories of data to support the operation of the electronic terminal 50. Examples of these data include: any executable program for operation on the electronic terminal 50, such as an operating system 521 and an application 522; the operating system 521 includes various system programs, such as a framework layer, a core library layer, a driver layer, etc., for implementing various basic services and processing hardware-based tasks. The application 522 may include various applications, such as a media player (MediaPlayer), a browser (Browser), etc., for implementing various application services. The tuning method of the RF accelerator provided in the embodiment of the present invention may be included in the application 522.

[0174] The method disclosed in the above embodiment of the present invention can be applied to the processor 51, or implemented by the processor 51. The processor 51 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the processor 51 or the instruction in the form of software. The above processor 51 may be a general processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The processor 51 can implement or execute the methods, steps and logic block diagrams disclosed in the embodiment of the present invention. The general processor 51 may be a microprocessor or any conventional processor, etc. In combination with the steps of the accessory optimization method provided in the embodiment of the present invention, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0175] In an exemplary embodiment, the electronic terminal 50 may be implemented by one or more application specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD) to execute the aforementioned method.

[0176] It should be noted that the memory includes but is not limited to random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage. Similarly, the processor may also be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic devices, and discrete hardware components.

[0177] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is called by a processor, the tuning method of the radio frequency accelerator is implemented.

[0178] Among them, the computer-readable storage medium can be a tangible device that can hold and store instructions used by the instruction execution device. The computer-readable storage medium can be, for example, (but not limited to) an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, and a mechanical encoding device.

[0179] The computer-readable program described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. A network adapter card or a network interface in each computing / processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing / processing device.

[0180] In summary, the tuning method, terminal and computer storage medium of the radio frequency accelerator provided by the present invention, according to the capacity difference between the unit tuning capacities of the two tuners, adjust the tuning radius of the tuners to the same unit tuning capacity of the two to determine the final tuning radius corresponding to the first tuner and the second tuner; and, based on the final tuning radius of the first tuner and the second tuner, obtain the depth adjustment ratio between the first tuner and the second tuner, so as to perform synchronous depth adjustment on the two tuners based on the depth adjustment ratio, so as to accurately and conveniently realize the tuning process of the tuner, greatly improving the tuning efficiency of the accelerator; in addition, the method of the present invention can also be applied to accelerators with other coupling structures, and thus has high scalability and flexibility.

[0181] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for tuning a radio frequency accelerator, characterized in that: The radio frequency accelerator comprises a first resonant cavity and a second resonant cavity which are coupled to each other, and a corresponding tuner is provided in each resonant cavity; The tuning method of the radio frequency accelerator comprises: Acquire a first tuning radius corresponding to the first tuner and a second tuning radius corresponding to the second tuner when the unit tuning capabilities are the same; Extracting a first electric field influence factor of the first tuner at a first tuning radius, and extracting a second electric field influence factor of the second tuner at a second tuning radius; constructing a tuning coefficient based on a ratio between the first electric field influence factor and the second electric field influence factor; The insertion depths of the first tuner and the second tuner are synchronously adjusted according to the tuning coefficient so that the frequency of the radio frequency accelerator reaches a target frequency.

2. The tuning method of the radio frequency accelerator according to claim 1, characterized in that: The implementation method of synchronously adjusting the insertion depths of the first tuner and the second tuner according to the tuning coefficient includes: Obtaining the unit tuning capability; Based on the frequency adjustment amount of the RF accelerator and the unit tuning capability, a total depth adjustment amount is obtained; based on the tuning coefficient and in combination with the total depth adjustment amount, a depth adjustment amount corresponding to the first tuner and a depth adjustment amount corresponding to the second tuner are respectively obtained.

3. The tuning method of the radio frequency accelerator according to claim 1, characterized in that: The implementation manner of extracting the first electric field influence factor of the first tuner at the first tuning radius is the same as the implementation manner of extracting the first electric field influence factor of the first tuner at the first tuning radius, including: Using one of the first tuner and the second tuner as a current tuner and fixing an insertion depth of the other tuner; For the current tuner, obtaining electric field uniformity coefficients corresponding to the total cavity at several different insertion depths; Based on different insertion depths and corresponding electric field uniformity coefficients, a relationship curve between the electric field uniformity coefficient and the insertion depth under the current tuner is constructed by linear fitting; The slope corresponding to the relationship curve is extracted as the electric field influence factor corresponding to the current tuner.

4. The tuning method of the radio frequency accelerator according to claim 1, characterized in that: The method for obtaining the electric field uniformity coefficient includes: Obtaining voltage distribution corresponding to each of the resonant cavities; Based on the voltage distribution of each of the resonant cavities, a coefficient characterizing the difference in voltage distribution between the resonant cavities is constructed as an electric field uniformity coefficient.

5. The tuning method of the radio frequency accelerator according to claim 1, characterized in that: The method for obtaining the first tuning radius and the second tuning radius includes: Respectively obtaining the unit tuning capabilities corresponding to the first tuner and the second tuner at the same reference radius; When detecting that the unit tuning capabilities of the two are different, adjusting the tuning radius of the tuner so that the unit tuning capabilities corresponding to the first tuner and the second tuner are the same; The reference radius is a preset tuner radius.

6. The tuning method of the radio frequency accelerator according to claim 5, characterized in that: The tuning radius adjustment method of the tuner includes: Using one of the first tuner and the second tuner as a current tuner; Get the unit tuning capability of another tuner at the current radius; Based on the unit tuning capability and the mapping relationship between the unit tuning capability corresponding to the current tuner and the tuning radius, the radius corresponding to the current tuner when the unit tuning capability is reached is extracted as the tuning radius of the current tuner; wherein the mapping relationship is used to characterize the changing characteristics of the unit tuning capability of the tuner as the tuning radius changes.

7. The tuning method of the radio frequency accelerator according to claim 6, characterized in that: The method for obtaining the mapping relationship includes: Obtaining the unit tuning capabilities corresponding to the current tuner under a plurality of different tuning radii; Based on different tuning radii and the unit tuning capabilities corresponding to the tuning radii, a linear fitting method is adopted to construct a fitting curve between the tuning radius and the unit tuning capability as the mapping relationship.

8. The tuning method of the radio frequency accelerator according to claim 5, characterized in that: The method for obtaining the reference radius includes: Set several different tuning radii; Under different tuning radii, obtaining a sixth relationship curve between the total cavity frequency and the tuner insertion depth, and obtaining a seventh relationship curve between the total cavity Q value and the tuner insertion depth; Extracting reference frequencies and reference Q values ​​corresponding to different tuning radii at the same reference depth from the sixth relationship curve and the seventh relationship curve; wherein the reference depth is any depth value not greater than the maximum insertion depth; For the same tuning radius, synthesizing the reference frequency and the reference Q value corresponding to the tuning radius to obtain a comprehensive value corresponding to the tuning radius; The maximum value among the comprehensive values ​​corresponding to the tuning radii is extracted, and the tuning radius corresponding to the maximum value is used as the reference radius.

9. The tuning method of the radio frequency accelerator according to claim 8, characterized in that: The method for obtaining the maximum insertion depth includes: Acquire the sixth relationship curve between the insertion depth and frequency of the tuner; In each of the sixth relationship curves, extract the turning point of the curve slope, and use the insertion depth corresponding to the turning point as the maximum insertion depth corresponding to the sixth relationship curve; The turning point is a curve point corresponding to when the slope of the curve is less than the slope threshold for the first time during the process of the slope of the curve changing from large to small.

10. The method for tuning a radio frequency accelerator according to any one of claims 1 to 9, characterized in that: The method for obtaining the unit tuning capability includes: Set one tuner as the current tuner and fix the insertion depth of the other tuner; For the current tuner, the frequencies corresponding to the total cavity at several different insertion depths are obtained respectively; based on the different insertion depths and the corresponding frequencies, a relationship curve between the frequency and the insertion depth is constructed by linear fitting; and the slope corresponding to the relationship curve is extracted as the unit tuning capability corresponding to the current tuner.

11. A terminal, characterized in that: It includes a processor and a memory, wherein the memory is communicatively connected to the processor; the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the terminal performs the tuning method of the radio frequency accelerator according to any one of claims 1 to 10.

12. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the tuning method of the radio frequency accelerator according to any one of claims 1 to 10 is implemented.

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