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微型微焦斑X射线闭管及阴极丝电子发射差异性

李帆 曹阳 牟欢 刘亚宁 李海涛 李保权

李帆, 曹阳, 牟欢, 刘亚宁, 李海涛, 李保权. 微型微焦斑X射线闭管及阴极丝电子发射差异性[J]. 空间科学学报. doi: 10.11728/cjss2022.06.211124122
引用本文: 李帆, 曹阳, 牟欢, 刘亚宁, 李海涛, 李保权. 微型微焦斑X射线闭管及阴极丝电子发射差异性[J]. 空间科学学报. doi: 10.11728/cjss2022.06.211124122
LI Fan, CAO Yang, MOU Huan, LIU Yaning, LI Haitao, LI Baoquan. Miniature Micro-focal X-ray Closed Tube and Electron Emission Difference of Cathode Wire (in Chinese). Chinese Journal of Space Science, xxxx, x(x): x-xx doi: 10.11728/cjss2022.06.211124122
Citation: LI Fan, CAO Yang, MOU Huan, LIU Yaning, LI Haitao, LI Baoquan. Miniature Micro-focal X-ray Closed Tube and Electron Emission Difference of Cathode Wire (in Chinese). Chinese Journal of Space Science, xxxx, x(x): x-xx doi: 10.11728/cjss2022.06.211124122

微型微焦斑X射线闭管及阴极丝电子发射差异性

doi: 10.11728/cjss2022.06.211124122
基金项目: 国家重点研发计划项目(2017 YFB0503300),国家自然科学基金项目(41604152,U1938111)和中国科学院青年创新促进会项目(2018178)共同资助
详细信息
    作者简介:

    李帆:E-mail:lifan_24@163.com

  • 中图分类号: TL929

Miniature Micro-focal X-ray Closed Tube and Electron Emission Difference of Cathode Wire

  • 摘要: 行星岩石成分原位测量是行星探测的基本需求,X射线荧光分析是开展元素成分测量的重要技术手段。针对深空探测X射线荧光分析仪的需要,设计并研制了一款微型微焦斑X射线闭管,尺寸为Φ15 mm × 22 mm,焦斑尺寸230 μm,工作时阳极接地,阴极接浮地负高压,最大电压为–50 kV。在微型X射线闭管研制过程中,开展了螺旋型钨丝、直线型钨丝、直线型铼钨丝等常用热阴极的电子发射差异性研究,测量了各型热阴极的电子发射效率。结果显示:在200 V阳极电压下,低铼含量直线型铼钨丝电子发射效率最大为27.87 μA·W–1,是螺旋型钨丝的4倍,直线型钨丝的6.8倍;掺铼钨丝电子发射效率远高于纯钨型阴极丝。此外,铼钨丝还具有电子发射快、预热要求低、对真空度要求不高等特点,是深空探测X射线闭管阴极丝较理想的选择。

     

  • 图  1  X射线管一体化阴极光学结构

    Figure  1.  Integrated cathode optical structure of X-ray tube

    图  2  微型X射线管阴极热电子塑形部分

    Figure  2.  Thermoelectronic forming part of cathode of miniature X-ray tube

    图  3  阴极测试结构

    Figure  3.  Cathode test structure

    图  4  实验测试电路

    Figure  4.  Experimental test circuit

    图  5  三种阴极丝发射效率对比

    Figure  5.  Comparison of emission efficiency of three kinds of filament

    图  6  三种阴极丝实验数据

    Figure  6.  Experimental data for three kind of filaments

    图  7  两次直线型铼钨丝实验发射效率比较

    Figure  7.  Comparison of emission efficiency between two linear rhenium tungsten wire experiments

    表  1  测试阴极丝物理参数

    Table  1.   Test physical parameters of cathode wire

    序号类型钨丝直径/μm钨丝长度/mm备注
    1螺旋型钨丝304螺旋直径150 μm,螺旋圈数20圈
    2直线型钨丝254
    3直线型铼钨丝124铼含量3%
    下载: 导出CSV

    表  2  三种阴极丝的实验数据

    Table  2.   Experimental data of the three kinds of filament

    螺旋型钨丝直线型钨丝直线型铼钨丝
    阴极丝功率/W电子电流/μA发射效率/(μA·W-1)阴极丝功率/W电子电流/μA发射效率/(μA·W-1)阴极丝功率/W电子电流/μA发射效率/(μA·W-1)
    0.250.10.390.260.10.380.081.012.02
    0.310.61.950.280.20.720.101.111.51
    0.361.23.330.300.20.670.112.521.75
    0.431.84.200.320.30.950.122.318.44
    0.502.34.640.360.61.680.132.921.50
    0.582.95.010.400.92.270.143.323.10
    0.673.65.370.441.12.490.153.623.92
    0.764.45.760.491.32.650.164.025.10
    0.885.25.880.541.52.780.174.325.66
    1.006.05.990.591.83.070.185.127.87
    1.157.36.340.641.92.970.195.227.06
    1.329.06.810.692.02.890.204.924.05
    1.459.56.550.742.02.700.215.023.43
    1.6010.66.610.792.22.780.225.122.78
    1.7811.86.630.245.422.72
    1.9611.25.720.266.324.56
    2.0211.65.750.289.333.74
    2.0911.95.71
    2.1312.15.69
    2.2112.55.67
    2.2812.05.27
    2.3212.35.29
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-11-24
  • 录用日期:  2022-04-15
  • 修回日期:  2022-05-06
  • 网络出版日期:  2022-11-03

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