CN-121985463-A - Beam feedback system and method for accelerator

CN121985463ACN 121985463 ACN121985463 ACN 121985463ACN-121985463-A

Abstract

The invention discloses a beam feedback system and method for an accelerator, wherein the beam feedback system comprises an acceleration module beam fast feedback module connected with an acceleration cavity and a harmonic cavity, the acceleration module beam fast feedback module monitors beam energy, energy distribution and beam cluster length in the beam acceleration module to obtain a measured value of the beam acceleration module, and the microwave amplitude and phase in the acceleration cavity and/or the harmonic cavity are controlled according to the measured value of the beam acceleration module so as to adjust the beam energy, the energy distribution and the beam cluster length in the beam acceleration module to target values. According to the method and the system provided by the invention, the beam fast feedback is synchronously operated in the small loop where each beam accelerating module is positioned, so that the beam state in each loop is ensured to be stable, and the problem of unstable beam parameters in the accelerator caused by environmental factors such as temperature and humidity fluctuation, external mechanical vibration and the like is solved.

Inventors

LI YUMING
ZHU JINFU
DING HONGLI
YANG JIAYUE
ZHANG WEIQING

Assignees

深圳先进光源研究院

Dates

Publication Date: 20260505
Application Date: 20260112

Claims (10)

1. The beam feedback system for the accelerator is characterized by comprising a plurality of beam acceleration modules, a beam feedback system and a beam feedback system, wherein the plurality of beam acceleration modules comprise an acceleration cavity and a harmonic cavity which are connected in sequence; The accelerating module beam fast feedback module comprises an accelerating module detection element and an accelerating module adjusting element; The acceleration module detection element is used for monitoring beam energy, energy distribution and beam cluster length in the beam acceleration module to obtain a measured value of the beam acceleration module; And the accelerating module adjusting element is used for controlling the microwave amplitude and the phase in the accelerating cavity and/or the harmonic cavity according to the measured value of the beam accelerating module so as to adjust the beam energy, the energy distribution and the beam cluster length in the beam accelerating module to the target value.
2. The beam feedback system for an accelerator of claim 1, wherein the acceleration module adjusting element comprises an amplitude adjusting subunit and a phase adjusting subunit; the amplitude adjusting subunit is used for adjusting the energy of the beam current according to the amplitude of the microwaves; the phase adjusting subunit is used for adjusting the energy distribution and the cluster length of the beam current according to the phase of the microwaves.
3. The beam feedback system for an accelerator of claim 1, wherein the accelerator further comprises an electron gun, the beam feedback system further comprises an electron gun beam fast feedback module connected with the electron gun, the electron gun beam fast feedback module comprises a beam group parameter detection element and a beam group parameter adjustment element; The beam cluster parameter detection element is connected to the rear end of the electron gun and is used for detecting the beam cluster charge quantity and the beam cluster arrival time of the electron beam emitted by the electron gun; The beam group parameter adjusting element is connected with the electron gun and the beam group parameter detecting element and is used for adjusting the laser power input into the electron gun according to the beam group charge quantity detected by the beam group parameter detecting element and adjusting the delay time of the laser according to the detected beam group reaching time so as to adjust the beam group charge quantity and the reaching time of the electron beam to the target value.
4. The beam feedback system for the accelerator according to claim 1, wherein the accelerator further comprises at least one acceleration heating module, the acceleration heating module comprises at least one acceleration cavity and a laser heater connected with the acceleration cavity, the beam feedback system further comprises a laser heater beam fast feedback module connected with the acceleration cavity and the laser heater, the laser heater beam fast feedback module comprises a beam energy detection element and a microwave control element; the beam energy detection element is used for monitoring the beam energy in the laser heater to obtain a beam energy measurement value; The microwave control element is connected with the acceleration cavity and the beam energy detection element and is used for controlling the microwave amplitude of the acceleration cavity according to the measured value of the beam energy so as to enable the measured value of the beam energy to reach a target value.
5. The beam feedback system for an accelerator of claim 4, wherein the relationship between the microwave amplitude and beam energy is: ΔE=q×E 0 ×L×cos(φ s )×T; Wherein delta E is energy gain obtained by particles, q is charge quantity of the particles, E 0 is microwave amplitude of an accelerating cavity, L is effective accelerating length of the accelerating cavity, phi s is synchronous phase of the particles relative to microwaves when the particles enter the accelerating cavity, and T is a transit time factor.
6. The beam feedback system for an accelerator of claim 4, wherein the electron gun beam fast feedback module, the laser heater beam fast feedback module, and the acceleration module beam fast feedback module each comprise multiple SFP interfaces, an FPGA connected to each SFP interface, a phase-locked loop connected to the FPGA, a memory, a module management controller, and a power manager.
7. The beam feedback system for an accelerator according to any one of claims 1-6, wherein the beam feedback system and the accelerator employ optical fibers for data transmission.
8. A beam feedback method for an accelerator, using the beam feedback system of claim 1, the beam feedback method comprising: Monitoring beam energy, energy distribution and beam cluster length in the beam accelerating module to obtain a measured value of the beam accelerating module; And controlling the microwave amplitude and the phase in the accelerating cavity and/or the harmonic cavity according to the measured value of the beam accelerating module so as to adjust the beam energy, the energy distribution and the beam cluster length in the beam accelerating module to the target value.
9. The beam feedback method for an accelerator according to claim 8, further comprising: detecting the beam cluster charge quantity and the beam cluster arrival time of an electron beam emitted by an electron gun; Adjusting laser power input into an electron gun according to the detected cluster charge quantity, and adjusting delay time of laser according to the detected cluster arrival time so as to adjust the cluster charge quantity and the arrival time of the electron beam to target values; and monitoring the beam energy in the laser heater to obtain a beam energy measurement value, and controlling the microwave amplitude of the accelerating cavity according to the beam energy measurement value so as to enable the beam energy measurement value to reach a target value.
10. The beam feedback method for an accelerator according to claim 8, wherein the step of monitoring beam energy, energy distribution and beam cluster length in the beam acceleration module to obtain a measured value of the beam acceleration module further comprises: determining initial laser power, initial laser delay time, initial microwave amplitude and initial phase of an acceleration cavity and initial microwave amplitude and initial phase of a harmonic cavity by utilizing physical simulation; and taking the initial laser power, the initial laser delay time, the initial microwave amplitude and the initial phase of the accelerating cavity and the initial microwave amplitude and the initial phase of the harmonic cavity as initial equipment control parameters when the beam feedback control of the accelerator is started.

Description

Beam feedback system and method for accelerator Technical Field The invention relates to the technical field of accelerators, in particular to a beam feedback system and a beam feedback method for an accelerator. Background In order to achieve high quality laser output, beam control of the particle stream in the accelerator is required to ensure good performance. Good performance includes aspects of beam energy, beam cluster length, or time of arrival stability. Due to the factors of humidity and temperature change, external mechanical oscillation and the like in the environment, the parameters such as the intensity, the position and the like of the beam can slowly drift in the operation process of the accelerator, so that the light emitting performance is weakened, and the particle beam meeting the required precision cannot be output. Accordingly, there is a need for further improvements in the art. Disclosure of Invention In view of the above-mentioned shortcomings in the prior art, the present invention aims to provide a beam feedback system and implementation method for an accelerator for a user, so as to overcome the problem of unstable beam parameters caused by environmental reasons or external mechanical vibration of the accelerator in the prior art. The technical scheme adopted for solving the technical problems is as follows: The invention discloses a beam feedback system for an accelerator, which is applied to the accelerator, wherein the accelerator comprises a plurality of beam acceleration modules, a beam feedback system and a beam feedback system, wherein the beam acceleration modules comprise an acceleration cavity and a harmonic cavity which are connected in sequence; The accelerating module beam fast feedback module comprises an accelerating module detection element and an accelerating module adjusting element; The acceleration module detection element is used for monitoring beam energy, energy distribution and beam cluster length in the beam acceleration module to obtain a measured value of the beam acceleration module; And the accelerating module adjusting element is used for controlling the microwave amplitude and the phase in the accelerating cavity and/or the harmonic cavity according to the measured value of the beam accelerating module so as to adjust the beam energy, the energy distribution and the beam cluster length in the beam accelerating module to the target value. Optionally, the acceleration module adjusting element comprises an amplitude adjusting subunit and a phase adjusting subunit; the amplitude adjusting subunit is used for adjusting the energy of the beam current according to the amplitude of the microwaves; the phase adjusting subunit is used for adjusting the energy distribution and the cluster length of the beam current according to the phase of the microwaves. Optionally, the accelerator further comprises an electron gun, wherein the beam feedback system further comprises an electron gun beam fast feedback module connected with the electron gun, and the electron gun beam fast feedback module comprises a beam group parameter detection element and a beam group parameter adjustment element; The beam cluster parameter detection element is connected to the rear end of the electron gun and is used for detecting the beam cluster charge quantity and the beam cluster arrival time of the electron beam emitted by the electron gun; The beam group parameter adjusting element is connected with the electron gun and the beam group parameter detecting element and is used for adjusting the laser power input into the electron gun according to the beam group charge quantity detected by the beam group parameter detecting element and adjusting the delay time of the laser according to the detected beam group reaching time so as to adjust the beam group charge quantity and the reaching time of the electron beam to the target value. Optionally, the accelerator further comprises at least one acceleration heating module, wherein the acceleration heating module comprises at least one acceleration cavity and a laser heater connected with the acceleration cavity, and the beam feedback system further comprises a laser heater beam fast feedback module connected with the acceleration cavity and the laser heater, wherein the laser heater beam fast feedback module comprises a beam energy detection element and a microwave control element; the beam energy detection element is used for monitoring the beam energy in the laser heater to obtain a beam energy measurement value; The microwave control element is connected with the acceleration cavity and the beam energy detection element and is used for controlling the microwave amplitude of the acceleration cavity according to the measured value of the beam energy so as to enable the measured value of the beam energy to reach a target value. Optionally, the relation between the microwave amplitude and the beam energy is: ΔE=q×E0×L×cos(φs)×T; Wherein delta E