Accelerator electric field homogenization adjustment, frequency modulation and resonant cavity target radius acquisition method

Abstract

The invention provides an accelerator electric field homogenization adjustment, frequency modulation and resonant cavity target radius acquisition method, and the method comprises the steps: obtaining electric field features corresponding to a resonant cavity, and constructing an electric field uniformity coefficient of a total cavity based on the electric field features; when the electric field uniformity coefficient does not meet the electric field uniformity condition, the cavity radius of each resonant cavity is adjusted based on the electric field characteristic of each resonant cavity, so that the electric field uniformity coefficient of the total cavity reaches the electric field uniformity condition; according to the invention, the drift tube accelerator can be rapidly and efficiently adjusted to be in an electric field uniform state, so that the electric field stability of the particle beam in the acceleration process is improved, and the acceleration effect of the particle beam is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of BNCT, and relates to a method for adjusting and modulating the electric field uniformity of an accelerator, and obtaining a target radius of a resonant cavity, and in particular to a method for adjusting the electric field uniformity of a drift tube accelerator, a method for modulating the frequency of a drift tube accelerator, a method for obtaining a target radius of a resonant cavity, and a storage medium and a terminal. Background Art

[0002] A drift tube accelerator is a device for accelerating particle beams such as neutron beams, ion beams or electron beams. Two resonant cavities are coupled through a coupling structure to form an entire accelerating cavity, wherein each resonant cavity includes multiple accelerating gaps. Based on the gap voltage generated by each accelerating gap, an electric field of the corresponding resonant cavity is formed, and the electric field of the drift tube accelerator is formed through coupling through the coupling structure to achieve acceleration of the particle beam.

[0003] Based on this, the acceleration effect of the drift tube accelerator on the particle beam is closely related to the electric field distribution in the accelerator; when the electric field distribution of the drift tube accelerator is uneven, it will lead to inconsistent energy gain of the particle beam during the acceleration process, that is, the acceleration state of the particle beam is unstable, which will lead to poor acceleration effect of the particle beam.

[0004] Therefore, when designing a drift tube accelerator, how to quickly and efficiently adjust the drift tube accelerator to a uniform electric field state has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide an electric field uniformity adjustment method for a drift tube accelerator, a frequency modulation method for a drift tube accelerator, a resonant cavity target radius acquisition method, and a storage medium and a terminal, so as to solve the technical problem that when the electric field distribution of the drift tube accelerator is uneven, the stability of the particle beam during re-acceleration is affected, thereby resulting in a poor acceleration effect.

[0006] In a first aspect, the present invention provides a method for adjusting electric field uniformity of a drift tube accelerator, comprising:

[0007] According to the cavity radius of each resonant cavity in the drift tube accelerator, the electric field characteristics corresponding to the resonant cavity are obtained; based on the electric field characteristics of each resonant cavity, the electric field uniformity coefficient of the total cavity is obtained; when the electric field uniformity coefficient does not meet the electric field uniformity condition, based on the electric field characteristics of each resonant cavity, the cavity radius of the resonant cavity is adjusted so that the electric field uniformity coefficient of the total cavity meets the electric field uniformity condition; wherein the drift tube accelerator includes a first resonant cavity and a second resonant cavity that are coupled to each other.

[0008] According to the cavity radius of each resonant cavity in the drift tube accelerator, the electric field characteristics corresponding to the resonant cavity are obtained; based on the electric field characteristics of each resonant cavity, the electric field uniformity coefficient of the total cavity is obtained; when the electric field uniformity coefficient does not meet the electric field uniformity condition, based on the electric field characteristics of each resonant cavity, the cavity radius adjustment process of the resonant cavity is performed to make the electric field uniformity coefficient of the total cavity meet the electric field uniformity condition; wherein the drift tube accelerator includes a first resonant cavity and a second resonant cavity that are coupled to each other.

[0009] In some embodiments of the first aspect of the present application, the electric field characteristics include voltage distribution; the electric field uniformity coefficient is a coefficient that characterizes the difference in voltage distribution between the resonant cavities, including: the electric field uniformity coefficient is the ratio of the voltage distribution of the first resonant cavity to the voltage distribution of the second resonant cavity, or the electric field uniformity coefficient is the difference between the voltage distribution of the first resonant cavity and the voltage distribution of the second resonant cavity.

[0010] In some implementations of the first aspect of the present application, the method for acquiring the voltage distribution includes:

[0011] The gap voltage corresponding to each accelerating gap in the resonant cavity is obtained; and the mean value of each gap voltage is extracted, and the mean value is used as the voltage distribution corresponding to the resonant cavity.

[0012] In some implementations of the first aspect of the present application, the execution method of the cavity radius adjustment process of the resonant cavity includes:

[0013] According to the electric field strength distribution of each of the resonant cavities, each of the resonant cavities is divided into a high electric field distribution cavity and a low electric field distribution cavity; based on a preset radius adjustment amount, the cavity radius of the low electric field distribution cavity is increased and / or the cavity radius of the high electric field distribution cavity is reduced; and it is detected whether the electric field uniformity coefficient after the cavity radius adjustment meets the electric field uniformity condition, so as to re-execute the cavity radius adjustment process of the resonant cavity if it is not met.

[0014] In a second aspect, the present invention further provides a frequency modulation method for a drift tube accelerator, comprising:

[0015] The method comprises obtaining a tuning ratio of a drift tube accelerator and a cavity radius of each resonant cavity when the electric field uniformity condition is satisfied; the tuning ratio is a ratio between the radius adjustment amounts corresponding to each resonant cavity; obtaining a resonant frequency of the drift tube accelerator based on the cavity radius of each resonant cavity; when the resonant frequency does not reach a target frequency, synchronously adjusting the cavity radius of each resonant cavity based on the tuning ratio so that the resonant frequency of the drift tube accelerator reaches the target frequency; wherein the electric field uniformity condition is achieved by using any of the electric field uniformization adjustment methods for the drift tube accelerator described above.

[0016] In some implementations of the second aspect of the present application, the method for acquiring the tuning ratio includes:

[0017] A first relationship curve of how the resonant frequency of the drift tube accelerator changes with the cavity radius of a first resonant cavity is obtained; a slope corresponding to the first relationship curve is extracted as the first tuning capability factor; a second relationship curve of how the resonant frequency of the drift tube accelerator changes with the cavity radius of a second resonant cavity is obtained; a slope corresponding to the second relationship curve is extracted as the second tuning capability factor; and a ratio between the first tuning capability factor and the second tuning capability factor is set as the tuning ratio.

[0018] In some implementations of the second aspect of the present application, the synchronously adjusting the cavity radius of each of the resonant cavities based on the tuning ratio includes:

[0019] When the resonant frequency is less than the preset frequency, the cavity radius of each resonant cavity is reduced at the same time; when the resonant frequency is greater than the preset frequency, the cavity radius of each resonant cavity is increased at the same time; and the ratio between the changes in the cavity radius of each resonant cavity is equal to the tuning ratio.

[0020] In a third aspect, the present invention further provides a method for obtaining a resonant cavity target radius, comprising:

[0021] According to the first cavity radius of each resonant cavity in the drift tube accelerator, the electric field characteristics corresponding to the resonant cavity are obtained; based on the electric field characteristics of each resonant cavity, the first cavity radius of the resonant cavity is adjusted so that the electric field uniformity coefficient of the total cavity satisfies the electric field uniformity condition; the tuning ratio of the drift tube accelerator when the electric field uniformity condition is satisfied and the second cavity radius of each resonant cavity are obtained; the tuning ratio is the ratio between the radius adjustment amounts corresponding to each resonant cavity; based on the tuning ratio, the second cavity radius of each resonant cavity is synchronously adjusted so that the resonant frequency of the drift tube accelerator reaches the target frequency; when the target frequency is reached, the second cavity radius corresponding to each resonant cavity is set to the target radius corresponding to the resonant cavity; wherein the drift tube accelerator comprises a first resonant cavity and a second resonant cavity coupled to each other.

[0022] In a fourth aspect, the present invention further provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for adjusting the electric field uniformity of a drift tube accelerator, or implements any of the above-described methods for modulating the frequency of a drift tube accelerator, or implements any of the above-described methods for acquiring the target radius of a resonant cavity.

[0023] In a fifth aspect, the present invention further provides a terminal, comprising 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 executes any of the above-described methods for adjusting the electric field uniformity of a drift tube accelerator, or any of the above-described methods for modulating the frequency of a drift tube accelerator, or when the program is executed by the processor, implements the above-described method for obtaining the target radius of the resonant cavity.

[0024] As described above, the electric field uniformity adjustment method, frequency modulation method, resonant cavity target radius acquisition method, storage medium and terminal of the drift tube accelerator described in the present application adjust the electric field uniformity of the drift tube accelerator by adjusting the cavity radius of the drift tube accelerator, so that the electric field distribution of the drift tube accelerator can be quickly and efficiently adjusted to a uniform electric field state, avoiding the instability of the particle beam caused by the inconsistent energy gain of the particle beam during the acceleration process, and obtaining a better particle beam acceleration effect. At the same time, the present application also synchronously adjusts the cavity radius of each resonant cavity through a preset tuning ratio, so that the resonant frequency of the drift tube accelerator meets the preset frequency requirement, while not affecting the electric field uniformity of the drift tube accelerator, avoiding the influence of the particle acceleration effect due to the change of the electric field uniformity of the drift tube accelerator during the frequency modulation process, and effectively improving the debugging efficiency of the drift tube accelerator before work. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a schematic structural diagram of the drift tube accelerator described in an embodiment of the present invention;

[0026] Figure 2 Shown is a schematic flow chart of the electric field uniformity adjustment method for the drift tube accelerator according to an embodiment of the present invention;

[0027] Figure 3 Shown is a schematic flow chart of a method for obtaining the voltage distribution of a resonant cavity according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram showing the flow of the cavity radius adjustment process of the resonant cavity according to the embodiment of the present invention;

[0029] Figure 5 Shown is a flow chart of a frequency modulation method for a drift tube accelerator according to an embodiment of the present invention;

[0030] Figure 6 Shown is a flow chart of a method for obtaining a tuning ratio according to an embodiment of the present invention;

[0031] Figure 7Shown is a schematic diagram of curve distribution of the first relationship curve and the second relationship curve in an embodiment of the present invention;

[0032] Figure 8 Shown is a schematic flow chart of a method for obtaining a target radius of a resonant cavity according to an embodiment of the present invention;

[0033] Fig. 9 Shown is a schematic diagram of the structure of an electronic terminal described in an embodiment of the present invention;

[0034] Description of Reference Numerals

[0035] C1-first resonant cavity; C2-second resonant cavity; C3-coupling unit; 31-electric field uniformity acquisition module; 32-electric field uniformity determination module; 41-cavity radius acquisition module; 42-resonance frequency acquisition module; 43-resonance frequency determination module; 50-electronic terminal; 51-processor; 52-memory; 53-network interface; 54-user interface; 55-bus system; 521-operating system; 522-application. DETAILED DESCRIPTION

[0036] 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.

[0037] The following will describe in detail the principles and implementation methods of the electric field uniformization adjustment method, the frequency modulation method, the resonant cavity target radius acquisition method, and the storage medium and terminal of the drift tube accelerator of the present embodiment, so that those skilled in the art can understand the electric field uniformization adjustment method, the frequency modulation method, the resonant cavity target radius acquisition method, and the storage medium and terminal of the drift tube accelerator of the present embodiment without creative work.

[0038] In order to solve the technical problems existing in the prior art, an embodiment of the present invention first provides an electric field uniformity adjustment method for a drift tube accelerator, which is used to adjust the electric field uniformity of the drift tube accelerator so that the electric field uniformity meets the working requirements of the drift tube accelerator.

[0039] The drift tube accelerator is an accelerator adopting a coupling structure, that is, the drift tube accelerator includes a first resonant cavity and a second resonant cavity which are coupled to each other.

[0040] See also Figure 1, which is a schematic diagram of the structure of the drift tube accelerator in one embodiment. Figure 1 As shown, the drift tube accelerator includes: a first resonant cavity C1, a second resonant cavity C2 and a coupling unit C3; the coupling unit C3 is located between the first resonant cavity C1 and the second resonant cavity C2, and is connected with each resonant cavity to form an integral accelerating cavity, so as to realize the physical field coupling of the first resonant cavity C1 and the second resonant cavity C2; the coupling unit C3, the first resonant cavity C1 and the second resonant cavity C2 are coaxially arranged to form a beam channel of the entire accelerating cavity, so that the particle beams all pass through the drift tube accelerator from the beam channel to avoid the deflection of the movement direction of the particle beam.

[0041] A plurality of drift tubes are arranged at intervals in the cavity of each resonant cavity; an acceleration gap for accelerating the beam is formed at intervals between two adjacent drift tubes; the drift tube is used to shield the transverse electric field so that a longitudinal electric field is formed in the acceleration gap, so that the particle beam is accelerated at each acceleration gap; and each drift tube is coaxially arranged and a drift tube through hole is provided on the axis; each drift tube through hole is connected to a coupling through hole in the coupling unit to jointly form the beam channel.

[0042] The drift tube accelerator accelerates particle beams such as neutron beams, ion beams or electron beams, and outputs high-speed particle beams for medical or other purposes.

[0043] When the electric field distribution of each resonant cavity is uneven, the energy gain of the particle beam during the acceleration process will be inconsistent, which will increase the instability of the particle beam and lead to poor acceleration effect of the particle beam.

[0044] In order to ensure the acceleration effect of the particle beam, the electric field uniformity adjustment method of the drift tube accelerator provided in the embodiment of the present invention is as follows: Figure 2 As shown, the following steps are included:

[0045] S100, obtaining electric field characteristics corresponding to each resonant cavity in the drift tube accelerator according to the cavity radius of the resonant cavity; and obtaining an electric field uniformity coefficient of the total cavity based on the electric field characteristics of each resonant cavity;

[0046] The cavity radius is the radial distance from the cavity center to the cavity edge in a plane perpendicular to the beam channel.

[0047] The electric field uniformity coefficient is a coefficient used to characterize the degree of similarity / difference of electric field characteristics between the resonant cavities.

[0048] The electric field characteristics of each resonant cavity are used to characterize the electric field state of each resonant cavity; illustratively, the electric field characteristics of each resonant cavity include but are not limited to electric field physical characteristics such as voltage distribution and electric field intensity distribution of each resonant cavity.

[0049] For ease of understanding, the following specific embodiments use voltage distribution as the electric field characteristic of the resonant cavity to illustrate the implementation method of step S100; those skilled in the art may know that, in other specific embodiments, the electric field intensity distribution may also be used as the electric field characteristic of the resonant cavity to execute step S100.

[0050] Specifically, when step S100 is executed, it includes:

[0051] Based on the cavity radius size of the first resonant cavity, obtaining a voltage distribution corresponding to the first resonant cavity; and based on the cavity radius size of the second resonant cavity, obtaining a voltage distribution corresponding to the second resonant cavity;

[0052] Based on the voltage distribution of each resonant cavity, a coefficient for characterizing the difference in voltage distribution between the resonant cavities is constructed as an electric field uniformity coefficient.

[0053] In an optional embodiment, the electric field uniformity is the ratio of the voltage distribution between the resonant cavities, so as to characterize the degree of voltage difference between the resonant cavities based on the size of the ratio; illustratively, the expression of the electric field uniformity coefficient is:

[0054]

[0055] 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.

[0056] 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 based on the size of the difference; illustratively, the expression of the electric field uniformity coefficient is:

[0057]

[0058] 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 electric field distribution 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 distribution.

[0059] It should be noted that the voltage distribution mentioned above is a characteristic parameter used to characterize the central tendency of the voltage data in the cavity; illustratively, the voltage distribution includes the voltage mean, median or other existing characteristic values ​​that characterize the central tendency of the data set.

[0060] Since a single resonant cavity is provided with a plurality of accelerating gaps, 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 in a manner such as: Figure 3 As shown, including:

[0061] S101, obtaining the gap voltage corresponding to each accelerating gap in the resonant cavity;

[0062] Specifically, the structural parameters corresponding to each accelerating gap in the resonant cavity are extracted; each structural parameter is input into an accelerator simulation platform, and the simulation platform is used to perform simulation calculations on the structural parameters to obtain a gap voltage corresponding to the accelerating gap.

[0063] Among them, the structural parameters include drift tube length, acceleration gap length and acceleration cycle length.

[0064] It should be noted that, in the present application, the parameter values ​​corresponding to the structural parameters are all predetermined values.

[0065] Exemplarily, the simulation platform is CST software.

[0066] S102, integrating the gap voltages corresponding to the acceleration gaps in the resonant cavity to obtain a voltage distribution of the resonant cavity.

[0067] Specifically, for each resonant cavity, after obtaining the gap voltage corresponding to each accelerating gap in the resonant cavity, the gap voltages are averaged, and the voltage average is used as the voltage distribution corresponding to the resonant cavity, that is:

[0068]

[0069] in, represents the average gap voltage of the I-th resonant cavity, represents the number of accelerating gaps in the resonant cavity, Represents the voltage value of the i-th acceleration gap.

[0070] It should be noted that the above content of the present application exemplifies a specific method for 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.

[0071] S200, determining whether the electric field uniformity satisfies a preset electric field uniformity condition; if not, adjusting the cavity radius of the resonant cavity based on the electric field characteristics of each resonant cavity so that the electric field uniformity coefficient of the total cavity satisfies the electric field uniformity condition;

[0072] The electric field uniformity condition is a state condition when the electric field uniformity of the drift tube accelerator meets the working requirements of the drift tube accelerator.

[0073] In the present application, the electric field uniformity condition is that the electric field uniformity coefficient is within the threshold range of the electric field difference.

[0074] Exemplarily, when the electric field uniformity coefficient is the ratio between the voltage distributions of the resonant cavities, the electric field uniformity condition is: the electric field uniformity coefficient is within a preset ratio range; exemplary, the ratio range is 0.95±0.005. That is, if the electric field uniformity coefficient is within the ratio range, it indicates that the electric field characteristics between the resonant cavities are highly similar, and it is determined that the electric field uniformity meets the preset electric field uniformity condition; if the electric field uniformity coefficient exceeds the ratio range, it indicates that the electric field characteristics between the resonant cavities are less similar, and it is determined that the electric field uniformity does not meet the preset electric field uniformity condition.

[0075] It should be noted that when the electric field uniformity coefficient is the difference between the voltage distributions of the resonant cavities, then correspondingly, the electric field uniformity condition is: the electric field uniformity coefficient is within a preset difference interval, which will not be elaborated here.

[0076] Specifically, after obtaining the electric field uniformity coefficient of the drift tube accelerator, it is determined whether the electric field uniformity coefficient satisfies the preset electric field uniformity condition; if so, the electric field uniformity adjustment of the drift tube accelerator is exited; if not, the size of the cavity radius of the first resonant cavity and / or the second resonant cavity is adjusted according to the current electric field characteristics of each resonant cavity, so as to re-execute the above steps S100 to S200 based on the drift tube accelerator after the cavity radius is adjusted, until the updated electric field uniformity coefficient satisfies the preset electric field uniformity condition

[0077] The method provided in the embodiment of the present application determines the electric field uniformity of the drift tube accelerator. When the electric field uniformity does not meet the preset condition requirement, the cavity radius of the drift tube accelerator is adjusted to achieve that the drift tube accelerator meets the electric field requirement when the drift tube accelerator is working. The electric field uniformity adjustment method of the drift tube accelerator provided in the embodiment has simple steps and is easy to operate, and achieves rapid and convenient adjustment of the electric field uniformity of the drift tube accelerator, effectively improves the adjustment efficiency of the drift tube accelerator, and is conducive to the practical application of the drift tube accelerator.

[0078] In order to improve the efficiency of the electric field uniformity adjustment, the cavity radius adjustment process of the resonant cavity is as follows: Figure 4 As shown, including:

[0079] S201, obtaining the electric field intensity distribution of each of the resonant cavities, and dividing each of the resonant cavities into a high electric field distribution cavity and a low electric field distribution cavity based on the electric field intensity distribution of the resonant cavity;

[0080] The electric field intensity distribution is a characteristic value that characterizes the electric field intensity distribution characteristics in the resonant cavity, including but not limited to a mean value, a median value, etc.

[0081] S202, based on a preset radius adjustment amount, increasing the cavity radius of the low electric field distribution cavity and / or reducing the cavity radius of the high electric field distribution cavity, so that the electric field strength of the low electric field distribution cavity increases after adjustment, and / or the electric field strength of the high electric field distribution cavity decreases after adjustment, thereby making the electric field strength distribution of each of the resonant cavities tend to be the same.

[0082] The radius adjustment amount is a preset radius adjustment size, which is used as the radius adjustment step of the resonant cavity; illustratively, if the cavity radius of each resonant cavity is 320 mm, the preset length is 1 mm.

[0083] Those skilled in the art may appreciate that, in other specific embodiments, the voltage distribution may also be used as the electric field characteristic of the resonant cavity to perform cavity radius adjustment of the resonant cavity, and the adjustment process is the same as the above-mentioned adjustment process and will not be described in detail here.

[0084] In order to meet the working requirements of the drift tube accelerator, during the design stage, it is often necessary to modulate the overall resonant frequency of the drift tube accelerator to the target frequency required for the working state; specifically, in the prior art, the frequency modulation design of the drift tube accelerator is usually based on adjusting the cavity radius of the resonant cavity; however, for the drift tube accelerator with a coupled structure, the electric field uniformity of the drift tube accelerator is easily destroyed in the process of adjusting the cavity radius of each resonant cavity respectively, thereby making it difficult for the electric field uniformity of the accelerator to reach the optimal working state, affecting the acceleration effect of the beam.

[0085] To solve the above problem, the present application further provides a frequency modulation method for a drift tube accelerator in a second aspect, which is used to reduce the influence of the frequency modulation process on the uniformity of the electric field in the drift tube accelerator during the frequency modulation process of the drift tube accelerator. Figure 5 , showing the frequency modulation method of the drift tube accelerator provided in an embodiment of the present invention, comprising the following steps:

[0086] S10, obtaining the cavity radius of each resonant cavity of the drift tube accelerator when the electric field uniformity condition is satisfied, and obtaining the tuning ratio of the drift tube accelerator when the electric field uniformity condition is satisfied;

[0087] The electric field uniformity condition is a state condition when the electric field uniformity of the drift tube accelerator meets the working requirements of the drift tube accelerator.

[0088] Specifically, the electric field uniformity coefficient of the drift tube accelerator is adjusted by using the electric field uniformity adjustment method as described above, so that the electric field uniformity coefficient of the drift tube accelerator satisfies a preset electric field uniformity condition; when the electric field uniformity condition is satisfied, the cavity radius of each resonant cavity in the drift tube accelerator is extracted as the cavity radius of each resonant cavity of the drift tube accelerator when the electric field uniformity condition is satisfied.

[0089] S20, when the resonance frequency does not reach the target frequency, based on the tuning ratio, synchronously adjusting the cavity radius of each of the resonance cavities so that the resonance frequency of the drift tube accelerator reaches the target frequency.

[0090] The target frequency is the resonant frequency that the drift tube accelerator needs to reach in order to achieve a target particle beam intensity.

[0091] The tuning ratio is the ratio between the radius adjustment amounts corresponding to each resonant cavity, and is used to achieve synchronous changes in the electric field characteristics of each resonant cavity during the tuning process.

[0092] Specifically, the current resonant frequency of the drift tube accelerator is obtained, and the relationship between the resonant frequency and the target frequency is determined; if the resonant frequency is less than the target frequency, the cavity radii of the resonant cavities are simultaneously reduced based on a preset tuning ratio, and the ratio of the reduction in cavity radius of each resonant cavity is equal to the tuning ratio; if the resonant frequency is greater than the target frequency, the cavity radii of the resonant cavities are simultaneously increased based on a preset ratio, and the ratio of the increase in cavity radius of each resonant cavity is equal to the tuning ratio.

[0093] Those skilled in the art will appreciate that the target resonant frequency may be a preset frequency range or a preset frequency value.

[0094] In this embodiment, the cavity radius of each resonant cavity is synchronously adjusted based on a preset tuning ratio, thereby ensuring that the drift tube accelerator can maintain the electric field uniformity unchanged during the frequency modulation process, thereby avoiding the poor particle acceleration effect of the drift tube accelerator caused by the change of the cavity radius, and effectively improving the debugging efficiency of the drift tube accelerator before work. The frequency modulation method of the drift tube accelerator provided by the present application is simple in steps and easy to operate, which further improves the debugging efficiency of the drift tube accelerator and is conducive to the practical application of the drift tube accelerator.

[0095] In some optional implementations, in order to improve the stability of the electric field uniformity of the drift tube accelerator during the frequency modulation process, it is necessary to obtain a more accurate tuning ratio. Figure 6 As shown, the method for obtaining the tuning ratio includes:

[0096] S21, obtaining a tuning capability factor corresponding to the first resonant cavity, and obtaining a tuning capability factor corresponding to the second resonant cavity;

[0097] The tuning capability factor corresponds to the resonant cavity and is used to characterize the factor affecting the change in cavity radius of the current resonant cavity on the change in the resonant frequency of the total cavity in the drift tube accelerator.

[0098] Specifically, for the first resonant cavity, only the cavity radius of the resonant cavity is changed (the cavity radius of the second resonant cavity is kept unchanged), and a first relationship curve of the resonant frequency of the drift tube accelerator changing with the cavity radius of the first resonant cavity is obtained; the slope corresponding to the first relationship curve is extracted, and the absolute value of the slope is used as the tuning capability factor corresponding to the first resonant cavity.

[0099] Similarly, for the second resonant cavity, only the cavity radius of the resonant cavity is changed (the cavity radius of the first resonant cavity is kept unchanged), and a second relationship curve of the resonant frequency of the drift tube accelerator changing with the cavity radius of the second resonant cavity is obtained; the slope corresponding to the second relationship curve is extracted, and the absolute value of the slope is used as the tuning capability factor corresponding to the second resonant cavity.

[0100] Among them, the slope is the slope of the fitted oblique line obtained after performing linear fitting on the relationship curve; it should be noted that, in some other embodiments, the slope as described above 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.

[0101] Exemplarily, the curve distribution of the first relationship curve and the second relationship curve is as follows: Figure 7 shown by Figure 7 It can be seen that the tuning capability factor corresponding to the first resonant cavity C1 is approximately 0.12; and the tuning capability factor corresponding to the second resonant cavity C2 is approximately 0.4.

[0102] S22: Set the ratio between the first tuning capability factor and the second tuning capability factor as the tuning ratio.

[0103] Exemplarily, the first relationship curve corresponding to the first resonant cavity C1 and the second relationship curve corresponding to the second resonant cavity C2 are as follows: Figure 7 As shown, the tuning ratio is the ratio of the tuning capability factor corresponding to the first resonant cavity C1 to the tuning capability factor corresponding to the second resonant cavity C2, which is 1:3.33.

[0104] When the drift tube accelerator is frequency modulated, in order to avoid destroying its electric field uniformity, a tuning ratio of 1:3.33 is adopted to perform synchronous adjustment on the cavity radius of the first resonant cavity C1 and the cavity radius of the second resonant cavity C2; that is, when the cavity radius of the first resonant cavity C1 decreases by 1 mm, the cavity radius of the second resonant cavity C2 decreases by 3.33 mm; when the cavity radius of the first resonant cavity C1 increases by 1 mm, the cavity radius of the second resonant cavity C2 increases by 3.33 mm.

[0105] In some optional embodiments, the resonant frequencies corresponding to multiple cavity radii of each resonant cavity can be obtained through simulation calculation or experiment to obtain a relationship curve; wherein, the simulation calculation can be implemented by electromagnetic field simulation software, such as CST software.

[0106] The method provided in this embodiment obtains the tuning ability factor corresponding to each resonant cavity by constructing a curve of the change relationship between the resonant frequency of the accelerator and the cavity radius, and constructs a tuning ratio based on the tuning ability factor corresponding to each resonant cavity, so that the constructed tuning ratio can accurately and objectively characterize the influence of the cavity radius of each resonant cavity on the resonant frequency of the accelerator, thereby effectively improving the accuracy of the tuning ratio, and improving the stability of the electric field while ensuring the uniformity of the electric field during the frequency modulation process of the accelerator.

[0107] In order to solve the above technical problems existing in the prior art, an embodiment of the present invention further provides a method for obtaining a target radius of a resonant cavity, which is used to obtain the target radius corresponding to each resonant cavity when the drift tube accelerator is adjusted to the target frequency.

[0108] In this embodiment, the method for obtaining the target radius of the resonant cavity is as follows: Figure 8 As shown, including:

[0109] S301, acquiring electric field characteristics corresponding to each resonant cavity in a drift tube accelerator according to a first cavity radius of the resonant cavity;

[0110] The first cavity radius is the cavity radius corresponding to each of the resonant cavities when the drift tube accelerator does not meet the electric field uniformity condition.

[0111] Exemplarily, the first cavity radius is an initial value of the radius preset for each resonant cavity.

[0112] In this embodiment, the implementation of step S301 is the same as the implementation of obtaining the electric field characteristics corresponding to the resonant cavity according to the cavity radius of each resonant cavity in the drift tube accelerator described in the above embodiment, and will not be repeated here.

[0113] S302, based on the electric field characteristics of each of the resonant cavities, adjusting the first cavity radius of the resonant cavity so that the electric field uniformity coefficient of the total cavity satisfies the electric field uniformity condition;

[0114] In this embodiment, the implementation of step S302 is the same as the implementation of the cavity radius adjustment process of the resonant cavity based on the electric field characteristics of each resonant cavity described in the above embodiment, and will not be repeated here.

[0115] S303, obtaining a tuning ratio of the drift tube accelerator and a second cavity radius of each resonant cavity when the electric field uniformity condition is satisfied;

[0116] Wherein, the second cavity radius is the cavity radius corresponding to each of the resonant cavities when the electric field uniformity condition is met;

[0117] The tuning ratio is the ratio between the radius adjustment amounts corresponding to each resonant cavity, and is used to achieve synchronous changes in the electric field characteristics of each resonant cavity during the tuning process.

[0118] In this embodiment, the implementation method of step S303 is the same as the implementation method of obtaining the cavity radius of each resonant cavity of the drift tube accelerator when the electric field uniformity condition is met, and obtaining the tuning ratio of the drift tube accelerator when the electric field uniformity condition is met in the above embodiment, and will not be repeated here.

[0119] S304, based on the tuning ratio, synchronously adjusting the second cavity radius of each of the resonant cavities so that the resonant frequency of the drift tube accelerator reaches a target frequency;

[0120] In this embodiment, the implementation of step S303 is the same as the implementation of synchronously adjusting the cavity radius of each resonant cavity based on the tuning ratio so that the resonant frequency of the drift tube accelerator reaches the target frequency in the above embodiment, and will not be repeated here.

[0121] S305 , when the target frequency is reached, the second cavity radius corresponding to each resonant cavity is set to the target radius corresponding to the resonant cavity.

[0122] The method for acquiring the target radius of the resonant cavity provided in this embodiment first uses the electric field uniformity adjustment method of the drift tube accelerator to adjust the electric field uniformity coefficient of the drift tube accelerator to meet the electric field uniformity condition, and then combines the frequency modulation method of the drift tube accelerator to adjust the frequency of the drift tube accelerator to the target frequency, so that the target radius corresponding to each resonant cavity of the drift tube accelerator when the target frequency is reached can be quickly and accurately acquired, effectively improving the acquisition efficiency of the cavity radius corresponding to the target frequency.

[0123] The method for obtaining the target radius of the resonant cavity provided in this embodiment adjusts the frequency of the drift tube accelerator to the target frequency by using the frequency modulation method of the drift tube accelerator, so that the target radius corresponding to each resonant cavity when the drift tube accelerator reaches the target frequency can be quickly and accurately obtained.

[0124] Based on the same technical concept, the electric field homogenization adjustment method of the drift tube accelerator, the frequency modulation method of the drift tube accelerator, or the method for obtaining the target radius of the resonance cavity provided in the above embodiments of the present invention can be implemented on the terminal side or the server side.

[0125] See also Fig. 9, 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.

[0126] 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.

[0127] 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.

[0128] 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 used to operate 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 can include various applications, such as a media player (MediaPlayer), a browser (Browser), etc., for implementing various application services. The electric field uniformization adjustment method of the drift tube accelerator, the frequency modulation method of the drift tube accelerator, or the method for obtaining the target radius of the resonant cavity that implements the embodiment of the present invention can be included in the application 522.

[0129] 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.

[0130] 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.

[0131] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the program is called by a processor, the method for adjusting the electric field uniformity of the drift tube accelerator, the method for adjusting the frequency of the drift tube accelerator, or the method for obtaining the target radius of the resonant cavity provided by the present invention is implemented.

[0132] 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.

[0133] 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.

[0134] It should be noted that, in the various embodiments of the present application, the serial numbers of the above steps do not indicate the order of execution. The execution order of the steps should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0135] 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 adjusting the electric field uniformity of a drift tube accelerator, comprising: According to the cavity radius of each resonant cavity in the drift tube accelerator, an electric field characteristic corresponding to the resonant cavity is obtained; Based on the electric field characteristics of each of the resonant cavities, obtaining the electric field uniformity coefficient of the total cavity; When the electric field uniformity coefficient does not meet the electric field uniformity condition, based on the electric field characteristics of each resonant cavity, adjusting the cavity radius of the resonant cavity so that the electric field uniformity coefficient of the total cavity meets the electric field uniformity condition; The drift tube accelerator comprises a first resonant cavity and a second resonant cavity which are coupled to each other.

2. The method according to claim 1, characterized in that The electric field characteristics include voltage distribution; the electric field uniformity coefficient is a coefficient that characterizes the difference in voltage distribution between the resonant cavities, including: the electric field uniformity coefficient is the ratio of the voltage distribution of the first resonant cavity to the voltage distribution of the second resonant cavity, or the electric field uniformity coefficient is the difference between the voltage distribution of the first resonant cavity and the voltage distribution of the second resonant cavity.

3. The method according to claim 2, characterized in that The method for obtaining the voltage distribution includes: Obtaining the gap voltage corresponding to each accelerating gap in the resonant cavity; The mean value of each gap voltage is extracted and used as the voltage distribution corresponding to the resonant cavity.

4. The method according to claim 1, characterized in that The adjusting the cavity radius of the resonant cavity based on the electric field characteristics of each resonant cavity includes: According to the electric field intensity distribution of each resonant cavity, each resonant cavity is divided into a high electric field distribution cavity and a low electric field distribution cavity; Based on a preset radius adjustment amount, increasing the cavity radius of the low electric field distribution cavity and / or reducing the cavity radius of the high electric field distribution cavity; It is detected whether the electric field uniformity coefficient after the cavity radius adjustment satisfies the electric field uniformity condition, so as to re-execute the adjustment process of the cavity radius of the resonant cavity if it does not satisfy the condition.

5. A frequency modulation method for a drift tube accelerator, comprising: Obtaining a tuning ratio of the drift tube accelerator and a cavity radius of each resonant cavity when the electric field uniformity condition is satisfied; the tuning ratio is a ratio between radius adjustment amounts corresponding to each resonant cavity; Based on the cavity radius of each of the resonant cavities, obtaining the resonant frequency of the drift tube accelerator; When the resonance frequency does not reach the target frequency, based on the tuning ratio, synchronously adjusting the cavity radius of each of the resonance cavities so that the resonance frequency of the drift tube accelerator reaches the target frequency; Wherein, the electric field uniformity condition is achieved by using the electric field uniformity adjustment method of the drift tube accelerator according to any one of claims 1 to 4.

6. The method according to claim 5, characterized in that The method for obtaining the tuning ratio includes: Obtaining a first relationship curve of the resonant frequency of the drift tube accelerator changing with the cavity radius of the first resonant cavity; extracting a slope corresponding to the first relationship curve as the first tuning capability factor; Obtaining a second relationship curve of the resonant frequency of the drift tube accelerator changing with the cavity radius of the second resonant cavity; extracting the slope corresponding to the second relationship curve as the second tuning capability factor; The ratio between the first tuning capability factor and the second tuning capability factor is set as the tuning ratio.

7. The method according to claim 5, characterized in that The synchronously adjusting the cavity radius of each resonant cavity based on the tuning ratio includes: When the resonant frequency is less than the preset frequency, the cavity radius of each resonant cavity is reduced at the same time; when the resonant frequency is greater than the preset frequency, the cavity radius of each resonant cavity is increased at the same time; and the ratio between the changes in the cavity radius of each resonant cavity is equal to the tuning ratio.

8. A method for obtaining a target radius of a resonant cavity, comprising: According to the first cavity radius of each resonant cavity in the drift tube accelerator, an electric field characteristic corresponding to the resonant cavity is obtained; Based on the electric field characteristics of each resonant cavity, adjusting the first cavity radius of the resonant cavity so that the electric field uniformity coefficient of the total cavity meets the electric field uniformity condition; Obtaining a tuning ratio of the drift tube accelerator and a second cavity radius of each resonant cavity when the electric field uniformity condition is satisfied; the tuning ratio is a ratio between radius adjustment amounts corresponding to each resonant cavity; Based on the tuning ratio, synchronously adjusting the second cavity radius of each of the resonant cavities so that the resonant frequency of the drift tube accelerator reaches a target frequency; When the target frequency is reached, the second cavity radius corresponding to each resonant cavity is set to the target radius corresponding to the resonant cavity; The drift tube accelerator comprises a first resonant cavity and a second resonant cavity which are coupled to each other.

9. A storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the electric field uniformization adjustment method of the drift tube accelerator described in any one of claims 1 to 4 is implemented, or when the program is executed by a processor, the frequency modulation method of the drift tube accelerator described in any one of claims 5 to 7 is implemented; or when the program is executed by a processor, the method for obtaining the target radius of the resonant cavity described in claim 8 is implemented.

10. A terminal, characterized in that: The invention comprises 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 executes the electric field uniformization adjustment method of the drift tube accelerator according to any one of claims 1 to 4 or the frequency modulation method of the drift tube accelerator according to any one of claims 5 to 7; or, when the program is executed by the processor, the method for obtaining the target radius of the resonant cavity according to claim 8 is implemented.

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