阅读说明：本技术 一种射频四极加速器调谐方法及装置、存储介质 (Tuning method and device for radio frequency quadrupole accelerator and storage medium ) 是由 于旭东 邢庆子 杜磊 郑曙昕 马鹏飞 关遐令 王学武 于 2019-02-02 设计创作，主要内容包括：本申请公开了一种射频四极加速器调谐方法及装置,存储介质,该射频四极加速器调谐方法包括如下调谐过程：获取在调谐器当前插入深度下所述加速器的场分布、频率分布,获取所述加速器的腔体频率与调谐器深度变化关系平均系数；确定所述加速器的场分布与目标场分布的第一差异信息、所述加速器的工作频率与目标频率的第二差异信息；当差异信息不满足预设要求时,确定新的插入深度以调整所述调谐器。本实施例提供的方案,减少了调谐次数。(The application discloses a tuning method and a device of a radio frequency quadrupole accelerator, and a storage medium, wherein the tuning method of the radio frequency quadrupole accelerator comprises the following tuning processes: acquiring field distribution and frequency distribution of the accelerator under the current insertion depth of the tuner, and acquiring an average coefficient of a cavity frequency of the accelerator and a depth change relation of the tuner; determining first difference information of field distribution and target field distribution of the accelerator and second difference information of working frequency and target frequency of the accelerator; when the difference information does not meet preset requirements, determining a new insertion depth to adjust the tuner. The scheme provided by the embodiment reduces the tuning times.)

1. A tuning method of a radio frequency quadrupole accelerator comprises the following tuning processes:

acquiring field distribution and frequency distribution of the accelerator under the current insertion depth of a tuner, wherein the frequency distribution comprises the working frequency of the accelerator;

acquiring an average coefficient of a relation between the cavity frequency of the accelerator and the depth change of the tuner;

determining first difference information of field distribution and target field distribution of the accelerator and second difference information of working frequency and target frequency of the accelerator;

when the first difference information or the second difference information does not meet the preset requirement, determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the structural parameters, the target field distribution and the target frequency of the accelerator, and determining a new insertion depth according to the field distribution, the structural parameters, the first difference information, the second difference information, the cavity frequency of the accelerator and the tuner depth change relation average coefficient and the influence matrix so as to adjust the tuner.

2. The method of tuning a radio frequency quadrupole accelerator according to claim 1, further comprising repeating the tuning process until a first difference information between the accelerator field distribution and a target field distribution and a second difference information between the accelerator operating frequency and a target frequency satisfy a predetermined requirement.

3. The method of tuning a radio frequency quadrupole accelerator according to claim 1, wherein determining first difference information between the field distribution of the accelerator and the target field distribution comprises:

determining a standard orthogonal basis of the field distribution in the accelerator according to the structural parameters, the target field distribution and the target frequency;

and decomposing the field distribution of the accelerator and the target field distribution according to the standard orthogonal basis to obtain two groups of decomposition coefficients, and taking the difference information between the two groups of decomposition coefficients as first difference information of the field distribution and the target field distribution of the accelerator.

4. The method of tuning a radio frequency quadrupole accelerator according to claim 1, wherein the determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the structural parameters of the accelerator, the target field distribution and the target frequency comprises:

and determining a standard orthogonal basis of the field distribution in the accelerator according to the structural parameters, the target field distribution and the target frequency, and determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the standard orthogonal basis.

5. A method for tuning a radio frequency quadrupole accelerator according to claim 4, wherein the element M of the influence matrix_ijThe following were used:

when i is 1 … 3N +3, N is the number of modes, j is 1 … K, and K is the number of tuners;

M_ij1, when i is 3N +4, j is 1 … K;

wherein, F₀Is the cut-off frequency of the mode corresponding to the standard orthogonal base, z (j) and q (j) are the position and quadrant of the jth tuner, X (z (j), q (j), i) is the value of the ith standard orthogonal base at the jth tuner position, F_iAnd i is 1 … 3N +3, N is the number of modes, j is 1 … K, and K is the number of tuners.

6. The method of tuning a radio frequency quadrupole accelerator according to claim 1, wherein the structural parameters comprise: the length of the accelerator, the number and position of the tuners, the location of the deletion point, the length of the tuners, and the number of modes.

7. The method of tuning a radio frequency quadrupole accelerator according to any of claims 1 to 6, wherein the determining a new insertion depth based on the field distribution, the structural parameter, the first difference information, the second difference information, the mean coefficient of cavity frequency versus tuner depth variation for the accelerator, and the influence matrix comprises:

determining a weight matrix M composed of weights of each tuner according to the field distribution of the accelerator and the cavity length of the accelerator₂；

Tuner insertion depth variationWherein M is₁For the purpose of the influence matrix, it is,and k is a vector formed by the first difference information and the second difference information, and is an average coefficient of the relation between the cavity frequency of the accelerator and the depth change of the tuner.

8. The method of tuning a radio frequency quadrupole accelerator according to claim 7, wherein the weight matrix M is₂The following were used:

and the weight of tuner i

Wherein H (z, q) is the field distribution of the accelerator, H (z (i), q (i)) is z (i), q (i) is the field distribution of the location, L is the cavity length of the accelerator, z (i) and q (i) are the location and quadrant of the ith tuner, i is 1 … K, K is the number of tuners.

9. A tuning apparatus for a radio frequency quadrupole accelerator, comprising a memory and a processor, the memory storing a program which, when read and executed by the processor, implements a tuning method for a radio frequency quadrupole accelerator according to any one of claims 1 to 8.

10. A computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors for implementing a radio frequency quadrupole accelerator tuning method as claimed in any one of claims 1 to 8.

Technical Field

The embodiment of the invention relates to a method and a device for tuning a radio frequency quadrupole accelerator and a computer-readable storage medium.

Background

The radio frequency quadrupole accelerator can perform beam bunching, focusing and accelerating on a proton beam or a heavy ion beam with low energy, and is one of the most commonly used low-energy linear accelerators in the field of accelerators. Currently, radio frequency quadrupole accelerators can be divided into four-wing radio frequency quadrupole accelerators and four-bar radio frequency quadrupole accelerators. The four wing type radio frequency quadrupole accelerator is generally higher in working frequency and more suitable for accelerating protons and heavy ions with low mass number. Before the four-wing type radio frequency quadrupole accelerator operates, tuning is indispensable, the tuning can offset field distribution and frequency change caused by machining errors, and if the field distribution and the frequency are greatly different from the design value, beam current is subjected to extra electric field force, so that beam current tracks, elliptical parameters and transmission efficiency are influenced.

The tuning method of the four-wing type radio frequency quadrupole accelerator at present generally implements tuning by changing the insertion depth of a tuner on the accelerator, so as to disturb the field distribution and the frequency in the cavity of the accelerator, and the structure of the tuner is generally shown in fig. 2. Due to the fact that the number of tuners on the cavity is large, tuning is a complex process due to the fact that the tuners jointly act on frequency and field distribution, and the insertion depth of each tuner needs to be adjusted for multiple times in order to guarantee high accuracy, and time and labor are consumed.

Disclosure of Invention

At least one embodiment of the invention provides a tuning method and device for a radio frequency quadrupole accelerator and a computer readable storage medium, and tuning efficiency is improved.

At least one embodiment of the present invention provides a tuning method for a radio frequency quadrupole accelerator, including the following tuning processes:

acquiring field distribution and frequency distribution of the accelerator under the current insertion depth of a tuner, wherein the frequency distribution comprises the working frequency of the accelerator;

acquiring an average coefficient of a relation between the cavity frequency of the accelerator and the depth change of the tuner;

determining first difference information of field distribution and target field distribution of the accelerator and second difference information of working frequency and target frequency of the accelerator;

when the first difference information or the second difference information does not meet the preset requirement, determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the structural parameters, the target field distribution and the target frequency of the accelerator, and determining a new insertion depth according to the field distribution, the structural parameters, the first difference information, the second difference information, the cavity frequency of the accelerator and the tuner depth change relation average coefficient and the influence matrix so as to adjust the tuner.

At least one embodiment of the present invention provides a tuning apparatus for a radio frequency quadrupole accelerator, including a memory and a processor, where the memory stores a program, and the program, when read and executed by the processor, implements the tuning method for a radio frequency quadrupole accelerator according to any one of the embodiments.

At least one embodiment of the invention provides a computer-readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the method for tuning a radio frequency quadrupole accelerator of any of the embodiments.

Compared with the related art, in at least one embodiment of the invention, the field distribution and the frequency distribution of the accelerator at the current insertion depth of the tuner are obtained, wherein the frequency distribution comprises the working frequency of the accelerator; acquiring an average coefficient of a relation between the cavity frequency of the accelerator and the depth change of the tuner; determining first difference information of field distribution and target field distribution of the accelerator and second difference information of working frequency and target frequency of the accelerator; and when the first difference information or the second difference information does not meet the preset requirement, determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the structural parameters, the target field distribution and the target frequency of the accelerator, and determining a new insertion depth according to the first difference information, the second difference information, the cavity frequency of the accelerator and the tuner depth change relation average coefficient and the influence matrix so as to adjust the tuner. The scheme provided by the embodiment can integrate the influences of the tuner on the field distribution and the frequency into the same matrix; the scheme provided by the embodiment can tune the field distribution and the frequency simultaneously, avoids the influence on the field distribution when the frequency is adjusted, reduces the workload and the tuning times.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a general structure of a four-wing type RF quadrupole accelerator;

fig. 2 is a general structure of a tuner;

FIG. 3 is a flow chart of a tuning method for a radio frequency quadrupole accelerator according to an embodiment of the present invention;

FIG. 4 is a flow chart of a method for tuning a radio frequency quadrupole accelerator according to another embodiment of the present invention;

FIG. 5 is an exemplary operating interface for a tuning program;

FIG. 6 is a flowchart illustrating the operation of the tuning procedure according to an embodiment of the present invention;

fig. 7 is a flow chart of a tuning apparatus for a rf quadrupole accelerator according to an embodiment of the present invention;

fig. 8 is a block diagram of a computer-readable storage medium provided by an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

An embodiment of the present invention provides a tuning method for a radio frequency quadrupole accelerator, as shown in fig. 3, including the following tuning processes:

step 301, acquiring field distribution and frequency distribution of the accelerator under the current insertion depth of a tuner, wherein the frequency distribution comprises the working frequency of the accelerator;

wherein, the frequency distribution and the field distribution of the accelerator can be obtained by a measuring mode; the frequency distribution and the field distribution are related to the insertion depth of the tuner. When the insertion depth of the tuner is changed, the frequency distribution and the field distribution are correspondingly changed, and the tuning of the accelerator is realized by changing the insertion depth of the tuner.

Step 302, acquiring an average coefficient of a cavity frequency and tuner depth change relation of the accelerator;

the average coefficient of the relation between the cavity frequency of the accelerator and the depth change of the tuner can be obtained through measurement.

Step 303, determining first difference information between field distribution and target field distribution of the accelerator and second difference information between working frequency and target frequency of the accelerator;

the target field distribution and the target frequency are targets to be achieved by tuning the accelerator.

And 304, when the first difference information or the second difference information does not meet the preset requirement, determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the structural parameter, the target field distribution and the target frequency of the accelerator, and determining a new insertion depth to adjust the tuner according to the field distribution, the structural parameter, the first difference information, the second difference information, the average coefficient of the cavity frequency of the accelerator and the depth change relation of the tuner and the influence matrix.

Wherein the structural parameters of the accelerator include at least one of: length of accelerator, number and location of tuners, location of deletion point, length of tuner, number of modes.

In the RFQ cavity, different discrete frequencies can excite different field distributions, each frequency corresponds to a mode, and the modes include a quadrupole mode and a dipole mode (the dipole mode is divided into a three-quadrant dipole mode and a two-four-quadrant dipole mode), which are respectively represented by TE21n and TE11n, where n is 0,1,2 …. The working frequency refers to the frequency of the TE210 mode, and in the process of calculating the orthonormal basis, each mode corresponds to one orthonormal basis, and the length of the cavity and the frequency measurement value of the mode corresponding to the orthonormal basis are required to be used for calculating the orthonormal basis. In the calculation process of the orthonormal base, an upper limit value needs to be set for n, and the upper limit value is the number of the modes.

And when the first difference information or the second difference information meets a preset requirement, ending tuning. Namely, the tuning process is repeatedly executed until the difference information between the field distribution and the target field distribution of the accelerator and the working frequency and the target frequency of the accelerator meet the preset requirement. And after the tuner is adjusted according to the new insertion depth, acquiring field distribution and working frequency of the accelerator at the new insertion depth, judging whether difference information between the field distribution and the working frequency distribution of the accelerator and the target field distribution and the working frequency distribution of the accelerator meet preset requirements, if so, finishing tuning, and if not, recalculating the new insertion depth to adjust the tuner.

In one embodiment, in step 303, determining first difference information between the field distribution of the accelerator and the target field distribution includes:

determining a standard orthogonal basis of the field distribution in the accelerator according to the structural parameters, the target field distribution and the target frequency;

specifically, the calculation method of the orthonormal basis is as follows:

the calculation expression of the orthonormal basis of the quadrupole mode TE21n is

The calculation expression of a three-quadrant dipolar mode is D₁(z，q，n)＝0(q＝2，4)

The calculation expression of the two-four quadrant dipolar mode is D₂(z，q，n)＝0(q＝1，3)

Wherein z represents the longitudinal position, Q represents the number of quadrants, n represents the mode order, Q_n(0)＝1，D_1n(n)＝D_2n(n)＝2。ω₄Angular frequency for quadrupole mode; omega. of₀₄Cut-off angular frequency, omega, for quadrupole mode₂Angular frequency, omega, of dipolar mode₀₂The cut-off angular frequency of the dipolar mode, and c the speed of light.

And decomposing the field distribution and the target field distribution of the accelerator according to the standard orthogonal basis to obtain two groups of decomposition coefficients, and taking the difference information between the two groups of decomposition coefficients as first difference information of the field distribution and the target field distribution of the accelerator.

In another embodiment, the field distribution at fixed location points of each quadrant of the RFQ is measured as "sample points," the tuner's matrix of influence on these points is calculated by measuring the amount of change in field strength at each "sample point" at different depths of the tuner, and the insertion depth of each tuner is inferred using this matrix and the difference between the measured field strength at the "sample point" and the target field strength.

According to the transmission line theory of the four-wing type radio frequency quadrupole accelerator, a series of standard orthogonal bases exist in the field distribution of the quadrupole mode and the dipole mode in the cavity. After the four quadrants of the cavity are connected, the actual field distribution can be decomposed according to the standard orthogonal bases, and a group of decomposition coefficients v can be obtained after decomposition, and can be used for describing any field distribution in the cavity.

In an embodiment, the determining 304 an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the structural parameters, the frequency distribution, and the target field distribution and the target frequency of the accelerator includes:

and determining a standard orthogonal basis of the field distribution in the accelerator according to the structural parameters, the target field distribution and the target frequency, and determining an influence matrix of the tuner on the field distribution and the frequency distribution of the accelerator according to the standard orthogonal basis.

In an embodiment, the element M of the influence matrix_ijThe following were used:

when i is 1 … 3N +3, N is the number of modes, j is 1 … K, and K is the number of tuners;

M_ij1, when i is 3N +4, j is 1 … K;

wherein, F₀Is the cut-off frequency of the mode corresponding to the standard orthogonal base, z (j) and q (j) are the position and quadrant of the jth tuner, X (z (j), q (j), i) is the value of the ith standard orthogonal base at the jth tuner position, F_iAnd i is 1 … 3N +3, N is the number of modes, j is 1 … K, and K is the number of tuners.

In one embodiment, the determining a new insertion depth according to the field distribution, the structural parameter, the first difference information, the second difference information, the mean coefficient of cavity frequency versus tuner depth variation of the accelerator, and the influence matrix in step 304 includes:

determining a weight matrix M formed by the weight of each tuner according to the field distribution of the accelerator and the cavity length of the accelerator by using the cavity frequency of the accelerator and the depth variation relation average coefficient of the tuners₂；

Tuner insertion depth variationWherein M is₁For the purpose of the influence matrix, it is,and k is a vector formed by the first difference information and the second difference information, and is an average coefficient of the relation between the cavity frequency of the accelerator and the depth change of the tuner.

Specifically, the first difference information (the difference between the measured coefficient vector of the field distribution decomposed according to the orthonormal basis and the measured coefficient vector of the field distribution decomposed according to the orthonormal basis) is recorded asThe second difference information (difference between the measured operating frequency and the target frequency) is denoted as f, and the change in insertion depth of each tuner to be calculated is denoted as fFirst, vector difference is calculatedCombined with the frequency difference f into a new vector

Then there is a relational expression

Matrix M₁Generalized inverse sum ofMatrix M₂Are respectively noted asAndat this time, the insertion depth variation of each tuner can be calculated by the following expression

And isWhere H (z, q) is the measured value of the field strength (i.e. the field distribution), L is the cavity length of the accelerator, z (q) and q (q) are the position and quadrant of the qth tuner, i is 1 … K, and K is the number of tuners. H (z), (q), q (i)) is the field distribution at the positions z (i), q (i).

The application is further illustrated by the following specific example.

As shown in fig. 4, the present embodiment provides a tuning method for a radio frequency quadrupole accelerator, including:

step 401, obtaining structural parameters and high-frequency parameters of a cavity of the accelerator, and measured frequency distribution and field distribution and average coefficients of a relation between cavity frequency and tuner depth change. Wherein the frequency distribution includes the operating frequency of the accelerator. Wherein the high frequency parameters include: target field distribution and target frequency;

step 402, calculating the orthonormal basis of the field distribution in the accelerator according to the structural parameters, the target field distribution and the target frequency distribution.

And 403, calculating an influence matrix of the depth of the tuner on the field distribution and the working frequency according to the orthonormal basis of the field distribution.

Step 404, decomposing the measured field distribution and the target field distribution according to the orthonormal basis to obtain two groups of decomposition coefficients, calculating the coefficient difference between the two groups of decomposition coefficients, namely first difference information, and subtracting the measured working frequency from the target frequency to obtain second difference information of the working frequency and the target frequency.

Step 405, when the first difference information and the second difference information meet preset requirements, ending tuning; when the first difference information and the second difference information do not meet the preset requirement, calculating a new insertion depth of the tuner according to the field distribution, the structural parameter, the first difference information, the second difference information, the influence matrix and an average coefficient of a cavity frequency of the accelerator and a tuner depth change relation, so as to adjust the insertion depth of the tuner to be the new insertion depth, and returning to step 401.

In the embodiment, a set of simple and rapid tuning method is designed by utilizing an equivalent circuit model and a perturbation theory of the four-wing type radio frequency quadrupole accelerator. In the embodiment, the influences of the tuner on the field distribution and the frequency are integrated into the same matrix; the change in the influence weight of each tuner can be calculated in real time from the measured field distribution when calculating the influence matrix of the tuners. The scheme provided by the embodiment can tune the field distribution and the frequency simultaneously, thereby avoiding the influence on the field distribution when the frequency is adjusted and reducing the workload; the influence weight change of each tuner can be calculated according to the measured field distribution, the accuracy of the calculation result is enhanced under the condition of processing the variable-voltage four-wing radio frequency quadrupole accelerator, and the tuning times are reduced.

According to the perturbation theory of the tuner, the frequency perturbation generated by the tuner results in a change of the coefficients of the field distribution, and this relationship can be described by the influence matrix of the tuner on the field distribution and the frequency, the element M of which influences the matrix_ijComprises the following steps:

where z (j) and q (j) are the position and quadrant of the jth tuner, X (z (j),q (j), i) is the value of the ith orthonormal base at the jth tuner position, F_iFrequency corresponding to the ith orthonormal base, F₀The cutoff frequency of the mode corresponding to the orthonormal basis is 1 … 3N +3, N is the number of modes, j is 1 … K, and K is the number of tuners. The influence of the tuner on the field distribution and the frequency can be described simultaneously after the matrix is expanded into an amplification matrix, and the amplification matrix is formed as follows:

wherein f is₀Is a target frequency, f_iThe frequency measured in the quadrupole mode, N is the number of modes, and K is the number of tuners.

Tuner weight variation is calculated from the measured field distribution:

according to the Slater perturbation theory, the influence of perturbation on frequency in the magnetic field area is proportional to the magnetic field energy at the perturbation position and the volume of the perturbation body:

f_j∝H²V

the weight of each tuner can be calculated by utilizing the measured field intensity, and the change of the insertion dimension of the tuner can be determined by the average coefficient of the relation between the weight and the change of the frequency of the measurement cavity and the depth of the tuner:

wherein p is_iThe weight of a tuner i is 1 … K, K is the number of the tuners, K is the average coefficient of the relation between the cavity frequency and the depth change of the tuners, and h is_iA variable amount of size is inserted for each tuner.

The present invention will be described in detail below with reference to tuning a quad-foil rf quadrupole accelerator as an example. As shown in fig. 5, the "Parameters" is a main parameter input interface, the "quadrat 1" - "quadrat 4" key is used to introduce the signal data of the measured Field distribution, the "Import Design Field" key is used to introduce the target Field distribution, the "flip not" option is used to calibrate the high energy end and the low energy end of the measured Field distribution, the "Basepoints" key is used to calibrate the baseline of the measured Field distribution, the "Cutpoints" key is used to calibrate the origin of the measured Field distribution, the "ProcessData" key is used to convert the signal data of the measured Field distribution into Field distribution amplitude values (the Field distribution is measured by a pull method, the beads cause frequency shift of the cavity working mode due to different Field strengths at different positions, the S12 phase change is proportional to the frequency shift near the working mode, the phase signal of the S12 signal is measured by vector network analysis, the phase change is squared, translated, normalized and smoothed to obtain the field distribution), the 'Save' key is used for smoothing and normalizing the measured field distribution, the 'models' key is used for performing mode decomposition and relative error calculation on the measured field distribution, and the 'Tune' key is used for calculating the new insertion depth of the tuner. The input Parameters to the "Parameters" interface include cavity length, number of single quadrant tuners, number of quadrupole modes used, target frequency, first four quadrupole and dipole mode frequency measurements, tuner position, and delete point position, where the delete point position is typically determined by the tuner position for smoothing the measured field distribution.

As shown in fig. 6, the tuning process based on the above procedure includes:

step 601, receiving input structural parameters of a four-wing radio frequency quadrupole accelerator to be tuned;

the structural parameters comprise the length of the accelerator, the number and the position of tuners, the position of a deletion point, the length of the tuners, the distribution of the target field and the number of modes used for calculation.

Step 602, receiving an input average coefficient of a relation between a measured cavity frequency and a tuner depth variation;

wherein the measurement method of the average coefficient refers to the correlation technique;

step 603, receiving input measurement signal data and frequency distribution of field distribution of four quadrants of the cavity, and the insertion depth of the tuner;

wherein, the field distribution measuring signal data and the frequency distribution can be obtained by measurement.

And step 604, setting 'Basepoints' and 'Cutpoints', and processing the measurement signal data of the field distribution to obtain the field distribution of the accelerator when the 'ProcessData' key is clicked.

Step 605, normalize and smooth the field distribution of the accelerator.

Wherein, the field distribution normalization and the smoothing processing of the accelerator can be realized by clicking the 'Save' key.

Step 606, calculating first difference information of field distribution of the accelerator and target field distribution; calculating second difference information of the operating frequency and the target frequency of the accelerator;

wherein, the first difference information of the field distribution of the accelerator and the target field distribution can be calculated by clicking the 'models' key, and the second difference information of the working frequency and the target frequency of the accelerator can be calculated.

Step 607, if the first difference information and the second difference information reach the preset requirement, the tuning is finished, otherwise, the step 608 is switched to;

step 608, calculate the new insertion depth of the tuner, and adjust the insertion depth of the tuner to the new insertion depth, go to step 603.

Wherein the new insertion depth of the tuner can be calculated by clicking the "Tune" key.

As shown in fig. 7, an embodiment of the present invention provides an rf quadrupole accelerator tuning apparatus 70, which includes a memory 710 and a processor 720, where the memory 710 stores a program, and when the program is read and executed by the processor 720, the program implements the rf quadrupole accelerator tuning method according to any embodiment.

As shown in fig. 8, an embodiment of the present invention provides a computer-readable storage medium 80, which stores one or more programs 81, and the one or more programs 81 can be executed by one or more processors to implement the rf quadrupole accelerator tuning method according to any of the embodiments.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.