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Beam bunch merging method and system in synchrotron

A synchrotron and cluster technology, applied in the field of merging clusters, can solve problems such as reducing the effective experiment time, prolonging the machine running period, and increasing the extraction time of components.

Inactive Publication Date: 2020-06-23
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can turn any number of bunches into a single bunch, but in order to control the growth of longitudinal emittance in the whole process, the process of scattering and trapping must satisfy the adiabatic condition, which requires that the time of scattering and trapping should be much longer Longer than the longitudinal oscillation period, therefore, using the above method to generate a single bunch will prolong the machine operating period, reduce the effective beam supply time, and finally reduce the effective experiment time; moreover, the length of a single bunch produced by recapture is about the circumference of the ring 1 / 2-1 / 3 of the 1 / 2-1 / 3, it is difficult to adjust the bunch length
For a synchrotron with a long circumference, a long bunch will increase the time for extracting components, especially the kicker platform of the rail magnet, which will increase the difficulty of design and the stability of operation

Method used

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  • Beam bunch merging method and system in synchrotron
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  • Beam bunch merging method and system in synchrotron

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Experimental program
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Embodiment 1

[0020] This embodiment discloses a method for merging bundles in a synchrotron, comprising the following steps:

[0021] S1. Set the operating frequency of the high-frequency system to 2 times the gyrofrequency of the beam n times, record the voltage of the high-frequency system, and the number of bunches is 2 n , where n is a positive integer;

[0022] S2. Reduce the number of bunches to 2 by adjusting the voltage value of the high-frequency system n / 2;

[0023] S3. Repeat step S2 until the number of clusters is reduced to 1 to realize cluster merging.

[0024] Wherein, the specific process of adjusting the voltage of the high-frequency system in step 2 is: the specific process of adjusting the voltage of the high-frequency system in step S2 is: assuming that the voltage value of the high-frequency system at this time is V i , i is the harmonic number of the high-frequency system, and V i at time t i Decrease to the cavity activation voltage value within, and at time t...

Embodiment 2

[0033] Based on the same inventive concept, this embodiment discloses specifically how to apply the method of combining beams in a synchrotron in Embodiment 1 to a high-current heavy ion synchrotron. In this embodiment, the 4th harmonic is used to accelerate the heavy ion beam in the booster BRing of the intense heavy ion synchrotron HIAF 238 u 35+ Take calculation, simulation and tracking as an example to demonstrate the process of bunch merging.

[0034] Such as figure 1 As shown, after the beam is injected and accumulated in the BRing, the beam is evenly distributed along the ring, and the momentum dispersion is Gaussian distribution. due to beam current 238 u 35+ The injection energy is 17MeV / u, and the corresponding beam gyrofrequency is 0.099MHz, which is far lower than the lower limit of the frequency of the high-frequency cavity. Such as figure 2 As shown, the high-frequency system works at the 4th harmonic to capture and accelerate the beam. Therefore, there wi...

Embodiment 3

[0040] Based on the same inventive concept, this embodiment discloses a system for merging bundles in a synchrotron, including:

[0041] The voltage detection module is used to set the operating frequency of the high-frequency system to be 2 times the gyrofrequency of the beam current n times, 2 n is the harmonic number, record the voltage of the high-frequency system, and the number of bunches is 2 at this time n , where n is a positive integer not equal to 1;

[0042] The voltage regulation module is used to reduce the number of bunches to 2 by regulating the voltage value of the high-frequency system n / 2, repeatedly adjust the voltage value of the high-frequency system until the number of bunches is reduced to 1 to realize bunching.

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Abstract

The invention belongs to the field of accelerators, and relates to a beam bunch merging method in a synchrotron. The method comprises the following steps: S1, the working frequency of a high-frequencysystem is 2n times of the cyclotron frequency of a beam current, namely the harmonic number is 2n, the voltage of the high-frequency system is recorded, the number of beam bunches is 2n at the moment, and n is a positive integer; S2, the number of beam bunches is reduced to 2n / 2 by adjusting the voltage of a high-frequency system; and S3, the step S2 is repeated until the number of the bunches isreduced to 1 to realize bunch combination. Compared with a beam splitting method, the method has the main advantages that the time spent on generating the single beam cluster can be shortened, and the final beam cluster length can be controlled to a great extent.

Description

technical field [0001] The invention relates to a method and system for merging bunches in a synchrotron, and belongs to the technical field of accelerators. Background technique [0002] The synchrotron controls the frequency of the magnetic field and the accelerating electric field according to the acceleration of the particles, and accelerates the particles through a resonant high-frequency cavity while keeping the orbital radius of the accelerated particles constant. Compared with the traditional linear accelerator and cyclotron, the synchrotron can achieve higher energy of. However, when the injection energy is low, the cyclotron frequency of the beam in the synchrotron is far below the lower limit of the frequency of the high-frequency system. At this time, if the high-frequency system works at the first harmonic, the acceleration of the beam cannot be achieved. Therefore, The operating frequency of the high-frequency system must be an integer multiple of the gyrotron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05H13/02H05H7/06
CPCH05H7/06H05H13/02H05H2007/065
Inventor 殷达钰刘杰杨建成申国栋杜衡
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI