Method for adjusting accelerator electric field homogenization, frequency modulation and obtaining target radius of resonant cavity

Abstract

The present invention provides a method for adjusting the electric field uniformity, frequency modulation, and obtaining the target radius of a resonant cavity of an accelerator. By obtaining the electric field characteristics corresponding to the resonant cavity, an electric field uniformity coefficient of the total cavity is constructed based on the electric field characteristics. When the electric field uniformity coefficient does not meet the electric field uniformity condition, the cavity radius of the resonant cavity is adjusted based on the electric field characteristics of each resonant cavity, so that the electric field uniformity coefficient of the total cavity reaches the electric field uniformity condition. The present invention can quickly and efficiently adjust the drift tube accelerator to an electric field uniform state, improve the electric field stability of the particle beam during the acceleration process, and thus enhance the acceleration effect of the particle beam.

Description

Technical Field

[0001] The present invention belongs to the technical field of BNCT, and relates to a method for adjusting the electric field uniformity, frequency modulation and obtaining the target radius of a resonant cavity of an accelerator, in particular to a method for adjusting the electric field uniformity of a drift tube accelerator, a method for frequency modulation of a drift tube accelerator, a method for obtaining the target radius of a resonant cavity, 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. The two resonant cavities are coupled through a coupling structure to form the entire accelerating cavity. Each resonant cavity includes a plurality of accelerating gaps. Based on the gap voltages 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 the coupling structure to realize the 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 cause inconsistent energy gain of the particle beam during the acceleration process, that is, the acceleration state of the particle beam is unstable, and further cause 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 state of uniform electric field 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 a method for adjusting the electric field uniformity of a drift tube accelerator, a method for frequency modulation of a drift tube accelerator, a method for obtaining the target radius of a resonant cavity, a storage medium and a terminal, which are used to solve the technical problem that when the electric field distribution of the drift tube accelerator is uneven, it affects the stability of the particle beam during the re-acceleration process, and further causes poor acceleration effect.

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

[0007] According to the cavity radius of each resonant cavity in the drift tube accelerator, obtain the electric field characteristics corresponding to the resonant cavity; based on the electric field characteristics of each resonant cavity, obtain 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, adjust the cavity radius of the resonant cavity 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 which are coupled.

[0008] According to the cavity radius of each resonator in the drift tube accelerator, obtain the electric field characteristics corresponding to the resonator; based on the electric field characteristics of each resonator, obtain 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 resonator, perform the process of adjusting the cavity radius of the resonator 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 resonator and a second resonator connected in a coupled manner.

[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 characterizing the voltage distribution difference between each resonator, including: the electric field uniformity coefficient is the ratio of the voltage distribution of the first resonator to the voltage distribution of the second resonator, or the electric field uniformity coefficient is the difference between the voltage distribution of the first resonator and the voltage distribution of the second resonator.

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

[0011] Obtain the gap voltage corresponding to each acceleration gap in the resonator; extract the mean value of each gap voltage and use this mean value as the voltage distribution corresponding to the resonator.

[0012] In some embodiments of the first aspect of the present application, the execution method of the process of adjusting the cavity radius of the resonator includes:

[0013] According to the electric field intensity distribution of each resonator, divide each resonator into a high electric field distribution cavity and a low electric field distribution cavity; based on a preset radius adjustment amount, increase the cavity radius of the low electric field distribution cavity and / or decrease the cavity radius of the high electric field distribution cavity; detect whether the electric field uniformity coefficient after the cavity radius adjustment meets the electric field uniformity condition, and re-execute the process of adjusting the cavity radius of the resonator when it does not meet.

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

[0015] Obtain the tuning ratio and the cavity radius of each resonator of the drift tube accelerator when the electric field uniformity condition is met; the tuning ratio is the ratio between the radius adjustment amounts corresponding to each resonator; based on the cavity radius of each resonator, obtain the resonance frequency of the drift tube accelerator; when the resonance frequency does not reach the target frequency, based on the tuning ratio, synchronously adjust the cavity radius of each resonator 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 as described above.

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

[0017] Obtain a first relationship curve of the resonance frequency of the drift tube accelerator varying with the cavity radius of the first resonance cavity; extract the slope corresponding to the first relationship curve as the first tuning ability factor; obtain a second relationship curve of the resonance frequency of the drift tube accelerator varying with the cavity radius of the second resonance cavity; extract the slope corresponding to the second relationship curve as the second tuning ability factor; set the ratio between the first tuning ability factor and the second tuning ability factor as the tuning ratio.

[0018] In some embodiments of the second aspect of the present application, the synchronous adjustment of the cavity radius of each resonance cavity based on the tuning ratio includes:

[0019] When the resonance frequency is less than the preset frequency, simultaneously reduce the cavity radius of each resonance cavity; when the resonance frequency is greater than the preset frequency, simultaneously increase the cavity radius of each resonance cavity; and the ratio between the change amounts of the cavity radii of each resonance cavity is equal to the tuning ratio.

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

[0021] According to the first cavity radius of each resonance cavity in the drift tube accelerator, obtain the electric field characteristics corresponding to the resonance cavity; based on the electric field characteristics of each resonance cavity, adjust the first cavity radius of the resonance cavity so that the electric field uniformity coefficient of the total cavity meets the electric field uniformity condition; obtain the tuning ratio and the second cavity radius of each resonance cavity when the drift tube accelerator meets the electric field uniformity condition; the tuning ratio is the ratio between the radius adjustment amounts corresponding to each resonance cavity; based on the tuning ratio, synchronously adjust the second cavity radius of each resonance cavity so that the resonance frequency of the drift tube accelerator reaches the target frequency; set the second cavity radius corresponding to each resonance cavity when reaching the target frequency as the target radius corresponding to the resonance cavity; wherein, the drift tube accelerator includes a first resonance cavity and a second resonance cavity which are coupled.

[0022] In a fourth aspect, the present invention further provides a storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the electric field uniformity adjustment method of the drift tube accelerator as described above arbitrarily, or when the program is executed by a processor, it implements the frequency modulation method of the drift tube accelerator as described above arbitrarily, or when the program is executed by a processor, it implements the method for obtaining the target radius of the resonance cavity as described above.

[0023] Fifth aspect, the present invention further provides a terminal, including a processor and a memory, which are communicatively connected; 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 uniformity adjustment method of the drift tube accelerator as described above arbitrarily, or the frequency modulation method of the drift tube accelerator as described above arbitrarily, or the method for obtaining the target radius of the resonant cavity as described above when the program is executed by the processor.

[0024] As described above, the electric field uniformity adjustment method of the drift tube accelerator, the frequency modulation method of the drift tube accelerator, the method for obtaining the target radius of the resonant cavity, and the storage medium and the terminal of the present application adjust the cavity radius of the drift tube accelerator to adjust the electric field uniformity of the drift tube accelerator, so that the electric field distribution of the drift tube accelerator can be quickly and efficiently adjusted to the electric field uniform state, avoiding the instability of the particle beam caused by inconsistent energy gain during the acceleration process of the particle beam, and obtaining a better particle beam acceleration effect. At the same time, the present application also synchronously adjusts the cavity radii of each resonant cavity through a preset tuning ratio, while making the resonant frequency of the drift tube accelerator meet the preset frequency requirements, without affecting the electric field uniformity of the drift tube accelerator, avoiding the influence of the change of the electric field uniformity of the drift tube accelerator during the frequency modulation process on the particle acceleration effect, and effectively improving the debugging efficiency of the drift tube accelerator before operation. Description of the Drawings

[0025] Figure 1 It shows a schematic structural diagram of the drift tube accelerator in the embodiment of the present invention;

[0026] Figure 2 It shows a schematic flowchart of the electric field uniformity adjustment method of the drift tube accelerator in the embodiment of the present invention;

[0027] Figure 3 It shows a schematic flowchart of the method for obtaining the voltage distribution of the resonant cavity in the embodiment of the present invention;

[0028] Figure 4 It shows a schematic flowchart of the process of adjusting the cavity radius of the resonant cavity in the embodiment of the present invention;

[0029] Figure 5 It shows a schematic flowchart of the frequency modulation method of the drift tube accelerator in the embodiment of the present invention;

[0030] Figure 6 It shows a schematic flowchart of the method for obtaining the tuning ratio in the embodiment of the present invention;

[0031] Figure 7It shows a schematic diagram of the curve distribution of the first relationship curve and the second relationship curve described in the embodiments of the present invention;

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

[0033] Figure 9 It shows a schematic structural diagram of an electronic terminal described in the embodiments 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 - Resonant frequency acquisition module; 43 - Resonant frequency determination module; 50 - Electronic terminal; 51 - Processor; 52 - Memory; 53 - Network interface; 54 - User interface; 55 - Bus system; 521 - Operating system; 522 - Application program. Detailed implementation manners

[0036] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0037] The following will elaborate in detail on the principle and implementation manners of the electric field uniformity adjustment method of the drift tube accelerator, the frequency modulation method of the drift tube accelerator, the method for obtaining the target radius of the resonant cavity, and the storage medium and the terminal in this embodiment, so that those skilled in the art can understand the electric field uniformity adjustment method of the drift tube accelerator, the frequency modulation method of the drift tube accelerator, the method for obtaining the target radius of the resonant cavity, and the storage medium and the terminal in this embodiment without creative labor.

[0038] In order to solve the technical problems existing in the prior art, the embodiments of the present invention first provide 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] Among them, the drift tube accelerator is an accelerator using a coupling structure, that is, the drift tube accelerator includes a first resonant cavity and a second resonant cavity that are coupled.

[0040] Please refer to Figure 1, shown as the structural schematic diagram of the drift tube accelerator in an embodiment. As Figure 1 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 to each resonant cavity to form an integral acceleration 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 acceleration cavity, so that the particle beam passes through the drift tube accelerator from the beam channel, avoiding the deflection of the movement direction of the particle beam.

[0041] Inside the cavity of each of the resonant cavities, a plurality of drift tubes arranged at intervals are provided; between two adjacent drift tubes, acceleration gaps for accelerating the beam are formed at intervals; the drift tubes are used to shield the transverse electric field, so that a longitudinal electric field is formed in the acceleration gaps, enabling the particle beam to be accelerated at each of the acceleration gaps; and, each of the drift tubes is coaxially arranged, and a drift tube through hole is provided at the axial part; each of the drift tube through holes is communicated with the coupling through holes 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 uses.

[0043] When the electric field distribution in each resonant cavity is uneven, it will cause the energy gain of the particle beam to be inconsistent during the acceleration process, thereby increasing the instability of the particle beam and resulting in poor acceleration effect of the particle beam.

[0044] To ensure the acceleration effect of the particle beam, the method for adjusting the electric field uniformity of the drift tube accelerator provided in the embodiment of the present invention, as Figure 2 shown, includes the following steps:

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

[0046] Wherein, 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 similarity / difference degree of the 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; exemplarily, the electric field characteristics of each resonant cavity include, but are not limited to, electric field physical characteristics such as the voltage distribution and electric field intensity distribution of each resonant cavity.

[0049] For ease of understanding, in the following specific embodiments, the voltage distribution is used as the electric field characteristic of the resonant cavity to illustrate the implementation manner of step S100; it can be known to those skilled in the art that in other specific embodiments, the electric field intensity distribution can 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, obtain the voltage distribution corresponding to the first resonant cavity; and based on the cavity radius size of the second resonant cavity, obtain the voltage distribution corresponding to the second resonant cavity;

[0052] Based on the voltage distributions of the respective resonant cavities, construct a coefficient for characterizing the voltage distribution difference between the respective resonant cavities as the electric field uniformity coefficient.

[0053] In an alternative embodiment, the electric field uniformity system is the ratio of the voltage distributions between the respective resonant cavities to characterize the voltage difference degree between the respective resonant cavities based on the magnitude of this ratio; exemplarily, the expression of the electric field uniformity coefficient is:

[0054]

[0055] Wherein, 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 voltage distribution difference between the respective resonant cavities, that is, the more uniform the electric field distribution; on the contrary, The greater the gap between the value and 1, the greater the voltage distribution difference between the respective resonant cavities, that is, the worse the uniformity of the electric field distribution.

[0056] In another alternative embodiment, the electric field uniformity system is the difference between the voltage distributions between the respective resonant cavities to characterize the voltage difference degree between the respective resonant cavities based on the magnitude of this difference; exemplarily, the expression of the electric field uniformity coefficient is:

[0057]

[0058] The closer the value is to 0, the smaller the voltage distribution difference between the respective resonant cavities, that is, the more uniform the electric field distribution; on the contrary, The greater the difference from 0 of the value is, the greater the difference in the voltage distribution of each of the resonant cavities is, that is, the worse the uniformity of the electric field distribution is.

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

[0060] Since multiple acceleration gaps are arranged in a single one of the resonant cavities, in order to more accurately and objectively characterize the voltage distribution corresponding to each of the resonant cavities, the method for obtaining the voltage distribution of the resonant cavity is as Figure 3 shown and includes:

[0061] S101, obtaining the gap voltages corresponding to the respective acceleration gaps in the resonant cavity;

[0062] Specifically, extracting the structural parameters corresponding to the respective acceleration gaps in the resonant cavity; inputting the respective structural parameters into an accelerator simulation platform, and using the simulation platform to perform simulation calculations on the structural parameters to obtain the gap voltages corresponding to the acceleration gaps.

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

[0064] It should be noted that in this application, the parameter values corresponding to the structural parameters are all pre-determined values.

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

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

[0067] Specifically, for each of the resonant cavities, after obtaining the gap voltages corresponding to the respective acceleration gaps in the resonant cavity, taking the mean value of the respective gap voltages, and using the voltage mean value as the voltage distribution corresponding to the resonant cavity, that is:

[0068]

[0069] Among them, represents the average gap voltage of the I-th resonant cavity, represents the number of acceleration 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 this application exemplarily gives a specific method for obtaining the voltage distribution corresponding to each resonator, but it is not limited thereto, as long as the voltage distribution conditions for characterizing each resonator can be obtained, for example, it can be obtained by direct calculation.

[0071] S200, determine whether the electric field uniformity meets the preset electric field uniformity condition. If it does not meet, adjust the cavity radius of the resonator based on the electric field characteristics of each resonator so that the electric field uniformity coefficient of the total cavity meets the electric field uniformity condition;

[0072] Among them, the electric field uniformity condition is the state condition when the electric field uniformity of the drift tube accelerator meets the working requirements of the drift tube accelerator.

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

[0074] Exemplarily, when the electric field uniformity coefficient is the ratio between the voltage distributions of each resonator, the electric field uniformity condition is: the electric field uniformity coefficient is within the preset ratio interval; exemplarily, the ratio range is 0.95±0.005. That is, if the electric field uniformity coefficient is within this ratio interval, it indicates that the similarity degree of the electric field characteristics between each resonator is relatively high, and it is determined that the electric field uniformity meets the preset electric field uniformity condition; if the electric field uniformity coefficient exceeds this ratio interval, it indicates that the similarity degree of the electric field characteristics between each resonator is relatively low, 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 each resonator, correspondingly, the electric field uniformity condition is: the electric field uniformity coefficient is within the preset difference interval, which will not be elaborated here.

[0076] Specifically, after obtaining the electric field uniformity coefficient of the drift tube accelerator, determine whether this electric field uniformity coefficient meets the preset electric field uniformity condition; if it meets, exit the electric field uniformity adjustment of the drift tube accelerator; if it does not meet, adjust the size of the cavity radius of the first resonator and / or the second resonator according to the current electric field characteristics of each resonator, so as to re-execute the above steps S100 to S200 based on the drift tube accelerator with the adjusted cavity radius until the updated electric field uniformity coefficient meets the preset electric field uniformity condition.

[0077] The method provided by the embodiments of the present application determines the electric field uniformity of the drift tube accelerator. When the electric field uniformity does not meet the requirements of the preset conditions, the cavity radius of the drift tube accelerator is adjusted to enable the drift tube accelerator to meet the electric field requirements during operation. Moreover, the steps of the method for adjusting the electric field uniformity of the drift tube accelerator provided in this embodiment are simple and easy to operate, achieving fast and convenient adjustment of the electric field uniformity of the drift tube accelerator, effectively improving the adjustment efficiency of the drift tube accelerator, and being conducive to the practical application of the drift tube accelerator.

[0078] To improve the efficiency of adjusting the electric field uniformity, the process of adjusting the cavity radius of the resonant cavity is as Figure 4 shown and includes:

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

[0080] wherein, the electric field intensity distribution is a characteristic value representing the electric field intensity distribution characteristics in the resonant cavity, including but not limited to the mean value, 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 decreasing the cavity radius of the high-electric-field-distribution cavity, so that the electric field intensity of the low-electric-field-distribution cavity increases after adjustment, and / or the electric field intensity of the high-electric-field-distribution cavity decreases after adjustment, thereby making the electric field intensity distributions of each of the resonant cavities tend to be the same.

[0082] wherein, the radius adjustment amount is a preset size adjustment of the radius, which is used as the radius adjustment step of the resonant cavity; for example, when the cavity radius of each resonant cavity is 320 mm, the preset length is 1 mm.

[0083] Those skilled in the art can know that in other specific embodiments, the voltage distribution can also be used as the electric field characteristic of the resonant cavity to perform the adjustment of the cavity radius of the resonant cavity. This adjustment process is the same as the above adjustment process and will not be elaborated 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, obtain the current resonance frequency of the drift tube accelerator, and determine the magnitude relationship between the resonance frequency and the target frequency. If the resonance frequency is less than the target frequency, simultaneously reduce the cavity radius of each resonance cavity based on a preset tuning ratio, and the ratio between the reduction amounts of the cavity radii of each resonance cavity is equal to the tuning ratio. If the resonance frequency is greater than the target frequency, simultaneously increase the cavity radius of each resonance cavity based on a preset ratio, and the ratio of the increase amounts of the cavity radii of each resonance cavity is equal to the tuning ratio.

[0093] Those skilled in the art can understand that the target resonance frequency can be a preset frequency range or a preset frequency value.

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

[0095] In some alternative embodiments, in order to improve the stability of the electric field uniformity of the drift tube accelerator during the frequency modulation process, a more accurate tuning ratio needs to be obtained. Based on this, as Figure 6 shown, the method for obtaining the tuning ratio includes:

[0096] S21, obtain the tuning ability factor corresponding to the first resonance cavity and obtain the tuning ability factor corresponding to the second resonance cavity;

[0097] Among them, the tuning ability factor corresponds to the resonance cavity and is used to characterize the factor that the change of the cavity radius of the current resonance cavity affects the resonance frequency of the total cavity in the drift tube accelerator.

[0098] Specifically, for the first resonance cavity, only change the cavity radius of this resonance cavity (keep the cavity radius of the second resonance cavity unchanged), obtain the first relationship curve of the resonance frequency of the drift tube accelerator changing with the cavity radius of the first resonance cavity; extract the slope corresponding to the first relationship curve, and use the absolute value of the slope as the tuning ability factor corresponding to the first resonance cavity.

[0099] Similarly, for the second resonant cavity, only change the cavity radius of this resonant cavity (while keeping the cavity radius of the first resonant cavity unchanged), and obtain a second relationship curve of the resonant frequency of the drift tube accelerator varying with the cavity radius of the second resonant cavity; extract the slope corresponding to the second relationship curve, and take the absolute value of the slope as the tuning ability factor corresponding to the second resonant cavity.

[0100] Wherein, 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 the average value or median value of the tangent slopes corresponding to each curve point in the corresponding relationship curve.

[0101] Exemplarily, the curve distributions of the first relationship curve and the second relationship curve are specifically as Figure 7 shown; from Figure 7 it can be known that the tuning ability factor corresponding to the first resonant cavity C1 is approximately 0.12; the tuning ability factor corresponding to the second resonant cavity C2 is approximately 0.4.

[0102] S22, set the ratio between the first tuning ability factor and the second tuning ability factor as the tuning ratio.

[0103] Exemplarily, when 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 Figure 7 shown, the tuning ratio is the ratio of the tuning ability factor corresponding to the first resonant cavity C1 to the tuning ability factor corresponding to the second resonant cavity C2, which is 1:3.33.

[0104] When performing frequency modulation on the drift tube accelerator, in order to avoid destroying its electric field uniformity, a tuning ratio of 1:3.33 is adopted to synchronously adjust the cavity radii of the first resonant cavity C1 and 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 alternative embodiments, the resonant frequencies corresponding to multiple cavity radii of each resonant cavity can be obtained through simulation calculation or experiment to obtain the relationship curve; among them, the simulation calculation can be implemented by an 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 variation 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 while ensuring the electric field uniformity during the frequency modulation process of the accelerator, improving the stability of the electric field.

[0107] To solve the above technical problems existing in the prior art, an embodiment of the present invention further provides a method for obtaining the 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 tuned to the target frequency.

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

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

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

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

[0112] In this embodiment, the implementation manner of step S301 is the same as the implementation manner 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 in the above embodiment, and will not be elaborated here.

[0113] S302, based on the electric field characteristics of each resonant cavity, adjust 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;

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

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

[0116] Wherein, the second cavity radius is the cavity radius corresponding to each resonant cavity 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 manner of step S303 is the same as that of obtaining the cavity radii 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 in the above embodiment, and will not be described herein again.

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

[0120] In this embodiment, the implementation manner of step S303 is the same as that of synchronously adjusting the cavity radii of each of the resonant cavities 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 described herein again.

[0121] S305, when the target frequency is reached, set the second cavity radii corresponding to each of the resonant cavities as the target radii corresponding to the resonant cavities.

[0122] The method for obtaining the target radius of the resonant cavity provided in this embodiment first adjusts the electric field uniformity coefficient of the drift tube accelerator to meet the electric field uniformity condition by using the electric field uniformity adjustment method of the drift tube accelerator, 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 radii corresponding to each resonant cavity of the drift tube accelerator when the target frequency is reached can be obtained quickly and accurately, 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 radii corresponding to each resonant cavity of the drift tube accelerator when the target frequency is reached can be obtained quickly and accurately.

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

[0125] Please refer to Figure 9, which is an optional hardware structure diagram of the electronic terminal 50 provided by the embodiment of the present invention. The electronic terminal 50 can 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 the functions of taking pictures / recording videos. The electronic terminal 50 includes: at least one processor 51, a memory 52, at least one network interface 53, and a user interface 54. Each component in the device is 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] Among them, the user interface 54 may include a display, a keyboard, a mouse, a trackball, a click gun, a key, a button, a touchpad, or a touch screen, etc.

[0127] It can be understood that the memory 52 can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), 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, StaticRandom Access Memory), synchronous static random access memory (SSRAM, Synchronous StaticRandomAccess Memory). The memory described in the embodiment of the present invention is intended to include but not limited to these and any other suitable categories of memories.

[0128] The memory 52 in the embodiment of the present invention is used to store various types 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 program 522; the operating system 521 contains 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 program 522 can contain various application programs, such as a media player (MediaPlayer), a browser (Browser), etc., for implementing various application services. The method for adjusting the electric field uniformity of the drift tube accelerator, or the frequency modulation method of the drift tube accelerator, or the method for obtaining the target radius of the resonant cavity in the embodiment of the present invention can be included in the application program 522.

[0129] The method disclosed in the embodiments of the present invention can be applied to or implemented by the processor 51. The processor 51 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method can be completed by the integrated logic circuit in hardware or instructions in software form in the processor 51. The above-mentioned processor 51 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 51 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor 51 may be a microprocessor or any conventional processor, etc. Combining the steps of the accessory optimization method provided by the embodiments of the present invention can be directly embodied as being executed and completed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and this storage medium is located in the memory. The processor reads the information in the memory and combines its hardware to complete the steps of the foregoing method.

[0130] In an exemplary embodiment, the electronic terminal 50 may be one or more application-specific integrated circuits (ASICs, Application Specific Integrated Circuit), DSPs, programmable logic devices (PLDs, Programmable Logic Device), complex programmable logic devices (CPLDs, Complex Programmable Logic Device) for executing the foregoing method.

[0131] The embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored. When the program is called by a processor, it implements the method for adjusting the electric field uniformity of the drift tube accelerator provided by the present invention, or the frequency modulation method of the drift tube accelerator, or the method for obtaining the target radius of the resonant cavity.

[0132] Among them, the computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. The computer-readable storage medium may 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 (non-exhaustive list) of the computer-readable storage medium include: portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memories), static random access memories (SRAM), portable compact disk read-only memories (CD-ROMs), digital versatile disks (DVDs), memory sticks, floppy disks, mechanical encoding devices.

[0133] The computer-readable programs described herein can be downloaded from a computer-readable storage medium to various computing / processing devices, or downloaded to an external computer or external storage device through a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. A network adapter or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0134] It should be noted that in various embodiments of the present application, the sequence numbers of the above steps do not represent the order of execution. The order of execution of each step should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0135] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should 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; and the electric field uniformity coefficient is a coefficient which characterizes the difference in voltage distribution between the resonant cavities.

2. The method according to claim 1, characterized in that The electric field characteristics include voltage distribution; 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 a 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 a slope corresponding to the second relationship curve as a 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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