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神龙二号热阴极注入器束流调试

代志勇 杨治勇 臧宗旸 张晓波 石金水 李劲 赖青贵 王敏鸿

代志勇, 杨治勇, 臧宗旸, 等. 神龙二号热阴极注入器束流调试[J]. 强激光与粒子束, 2018, 30: 075102. doi: 10.11884/HPLPB201830.170098
引用本文: 代志勇, 杨治勇, 臧宗旸, 等. 神龙二号热阴极注入器束流调试[J]. 强激光与粒子束, 2018, 30: 075102. doi: 10.11884/HPLPB201830.170098
Dai Zhiyong, Yang Zhiyong, Zang Zongyang, et al. Beam transport tuning of Dragon-Ⅱ injector with thermal cathode[J]. High Power Laser and Particle Beams, 2018, 30: 075102. doi: 10.11884/HPLPB201830.170098
Citation: Dai Zhiyong, Yang Zhiyong, Zang Zongyang, et al. Beam transport tuning of Dragon-Ⅱ injector with thermal cathode[J]. High Power Laser and Particle Beams, 2018, 30: 075102. doi: 10.11884/HPLPB201830.170098

神龙二号热阴极注入器束流调试

doi: 10.11884/HPLPB201830.170098
基金项目: 国家专项基金项目
详细信息
    作者简介:

    代志勇(1968—),男,博士,研究员,从事强流电子束输运与聚焦研究; dzycaep@sina.cn

  • 中图分类号: TL501;TL503

Beam transport tuning of Dragon-Ⅱ injector with thermal cathode

  • 摘要: 神龙二号注入器是一台感应叠加型强流脉冲电子束源,采用热阴极工作模式,为神龙二号加速器提供间隔可调的三脉冲电子束。该注入器的束流调试采取PIC模拟和实验调试交互验证、互相促进的方式,先是通过束斑测量确定引导线圈磁场的加载范围,然后通过PIC方法逐级梳理阳极段束线各线圈的磁场配置,再通过束斑测量加以确认。通过这种束流调试方法,获得了保持束流脉冲平顶完整通过的三种磁场配置,以适应下游加速段束流传输的不同要求。讨论了影响束流调试效果的因素,认为提升神龙二号注入器性能的关键是进一步改进大面积热阴极发射的均匀性。
  • 图  1  神龙二号注入器束线

    Figure  1.  Layout of beam transport line in Dragon-Ⅱ injector

    图  2  PIC模拟中的二极管电压加载波形

    Figure  2.  Diode voltage waveforms in PIC simulation

    图  3  三种磁场配置的PIC模拟结果

    Figure  3.  PIC simulation results

    图  4  注入器束流波形的模拟结果与BPM测量结果比较

    Figure  4.  PIC simulation results of beam current waveforms compared with BPM measured at injector exit

    图  5  不同轮次调试实验中出现的几种束斑图像

    Figure  5.  Several beam images in different tunes

    图  6  同一轮次调试实验中不同输运磁场下的束斑变化

    Figure  6.  Variations of beam spot in one tune

    表  1  神龙二号注入器线圈磁铁参数

    Table  1.   Parameters of solenoid magnets in Dragon-Ⅱ injector

    solenoid magnet length/mm average radius of winding/mm winding turns location (from cathode plane)/cm peak magnetic field/(10-4 T·A-1)
    BC 119 254 416 -12.4 9.8
    LC1 172 175 732 42.6 23.5
    LC2 217 175 923 84.4 28.1
    Z08~Z12 373 239 1320 145.6~334.8 27.0
    Z13 373 239 2320 381.0 27.0
    MC 338 108.4 1920 432.3 60.2
    下载: 导出CSV

    表  2  注入器线圈励磁电流的三种配置

    Table  2.   Three kinds of magnetic field configuration of Dragon-Ⅱ injector

    solenoid magnet exciting current/A solenoid magnet exciting current/A
    tune A tune B tune C tune A tune B tune C
    BC 6.8 5.7 5.7 LC1 43 35 35
    LC2 0 10 10 Z08 8 15 8
    Z09 10 16 10 Z10 13 17 13
    Z11 12 18 12 Z12 13 19 13
    Z13 0 20 0 MC 10 15 10
    下载: 导出CSV

    表  3  二极管区线圈对阴极面中心轴向磁场的贡献

    Table  3.   Remains of magnetic field in cathode surface caused by diode area solenoids

    solenoid magnet calculated Bz/(10-4 T·A-1) measured Bz/(10-4 T·A-1)
    BC -4.337 -4.300
    LC1 0.678 0.688
    LC2 0.094 0.075
    下载: 导出CSV

    表  4  调节LC1时束斑变化情况

    Table  4.   Variation of beam spot in LC1 adjustment

    shot IBC/A ILC1/A peak current/kA peak voltage/MV beam size/cm beam shape
    No.1674 6.8 43 2.29 2.62 9.7
    No.1663 7.2 45 2.25 2.61 7.5
    No.1668 7.4 46 2.22 2.59 6.5
    No.1669 7.5 47 2.25 2.57 6.6
    No.1672 7.9 49 2.21 2.56 8.6
    下载: 导出CSV

    表  5  调节Z08时束斑变化

    Table  5.   Variation of beam spot in Z08 adjustment

    shot IZ08/A peak current/kA peak voltage/MV beam size/cm beam shape
    No.1675 10 2.25 2.61 7.6
    No.1676 15 2.27 2.63 6.0
    No.1680 17 2.26 2.61 4.8
    No.1677 20 2.22 2.59 3.6
    No.1678 25 2.28 2.62 2.6
    No.1679 30 2.33 2.59 4.1
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-07-29
  • 修回日期:  2018-01-24
  • 刊出日期:  2018-07-15

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