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4 MeV闪光X光机轫致辐射靶设计

何辉 禹海军 王毅 戴文华

何辉, 禹海军, 王毅, 等. 4 MeV闪光X光机轫致辐射靶设计[J]. 强激光与粒子束, 2019, 31: 125102. doi: 10.11884/HPLPB201931.190273
引用本文: 何辉, 禹海军, 王毅, 等. 4 MeV闪光X光机轫致辐射靶设计[J]. 强激光与粒子束, 2019, 31: 125102. doi: 10.11884/HPLPB201931.190273
He Hui, Yu Haijun, Wang Yi, et al. Design of bremsstrahlung target of 4 MeV flash X-ray machine[J]. High Power Laser and Particle Beams, 2019, 31: 125102. doi: 10.11884/HPLPB201931.190273
Citation: He Hui, Yu Haijun, Wang Yi, et al. Design of bremsstrahlung target of 4 MeV flash X-ray machine[J]. High Power Laser and Particle Beams, 2019, 31: 125102. doi: 10.11884/HPLPB201931.190273

4 MeV闪光X光机轫致辐射靶设计

doi: 10.11884/HPLPB201931.190273
基金项目: 国防科技基础研究基金项目
详细信息
    作者简介:

    何 辉(1969—),男,本科,从事直线感应加速器研究;1624496919@qq.com

    通讯作者:

    禹海军(1970—),男,硕士,副研究员,从事强流电子束与物质相互作用研究;caepyhj@163.com

  • 中图分类号: TL53

Design of bremsstrahlung target of 4 MeV flash X-ray machine

  • 摘要: 对4 MeV闪光X光机的轫致辐射靶参数进行了设计和模拟计算。利用蒙特卡罗程序,计算得到当轫致辐射靶的有效钽靶材厚度约为0.6 mm时,靶正前方1 m处产生的单脉冲X光的照射量值最大,可以达到约2.86×10-3 C/kg,满足4 MeV闪光X光机对其单脉冲X光的设计要求。对不同能量下的单脉冲电子束加载在轫致辐射靶上的能量沉积密度进行了计算和比较,分析研究了不同结构下的靶破坏,结果表明:轫致辐射靶采用叠靶结构的钽靶能够满足4 MeV闪光机的实验需求。
  • 图  1  轫致辐射产生X光示意图

    Figure  1.  Generation of the bremsstrahlung radiation X ray

    图  2  归一化X光照射量随钽靶厚度的变化曲线

    Figure  2.  Curve of normalized X ray exposure versus tantalum thickness

    图  3  0.6 mm钽靶产生的归一化光通量随辐射角分布

    Figure  3.  Curve of normalized photon flux versus radiation angle for 0.6 mm tantalum target

    图  4  12 MeV LIA 不同结构靶破坏

    Figure  4.  Damage of different targets for 12 MeV LIA

    图  6  不同脉冲作用下的神龙二号加速器钽叠靶的破坏

    Figure  6.  Damage of the tantalum distributed target impinged by different electron beams from Dragon-Ⅱ accelerator

    图  5  神龙一号加速器钽叠靶破坏

    Figure  5.  Damage of tantalum distributed target for Dragon-Ⅰaccelerator

    表  1  照射量转换因子的能量依赖关系

    Table  1.   Exposure conversion factor change with photon energy

    $h\nu $/MeV$\varepsilon $ /(J·m-2·R-1
    0.010.019
    0.02 0.171
    0.05 2.151
    0.13.847
    0.23.294
    0.52.940
    13.140
    23.731
    34.258
    44.668
    54.960
    65.291
    85.706
    105.979
    156.419
    206.364
    下载: 导出CSV

    表  2  单脉冲电子束作用下靶正前方1 m处X光照射量比较

    Table  2.   Comparison of X ray exposure at 1 m just in front of the target impacted by the single pulse electron beam

    methodsW/MeVI/kA$\tau $/nsX/(C·kg-1)
    Martin formula 4 2.5 60 2.07×10-3
    MCNP simulation 4 2.5 60 2.86×10-3
    下载: 导出CSV

    表  3  单脉冲电子束作用下不同轫致辐射靶的破坏比较

    Table  3.   Comparison of damage for different bremsstrahlung targets impacted by single pulse electron beam

    W/MeVI/kA$\tau $/nsX-ray spot/mmD/(J·mm-2target structuretarget destroyed
    12 MeV LIA 12 2.5 80 3.2 298.6 slab melting ablation/perforation
    distributed no change
    Dragon-Ⅰ 20 2.0 60 1.5 1358.8 distributed perforation
    Dragon-Ⅱ 20 2.0 60 2 764.3 distributed perforation
    4 MeV X-ray machine 4 2.0~2.5 60 2 152.9~191.1 distributed no transformation (estimated)
    下载: 导出CSV
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  • 被引次数: 0
出版历程
  • 收稿日期:  2019-07-23
  • 修回日期:  2019-11-06
  • 刊出日期:  2019-12-01

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