中国物理B ›› 2009, Vol. 18 ›› Issue (5): 1807-1813.doi: 10.1088/1674-1056/18/5/015

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Studying a kind of portable ultra-bright microfocus x-raysource

牛憨笨1, 王凯歌2, 王雷3   

  1. (1)Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China; (2)Institute of Photonics {& Photonic Technology, Northwest University, Xi'an 710069, China;Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China; (3)Xi'an Institute of Applied Optics, Xi'an 710065, China
  • 收稿日期:2008-09-19 修回日期:2008-10-15 出版日期:2009-05-20 发布日期:2009-05-20
  • 基金资助:
    Project supported by the Major Program of the National Natural Science Foundation of China (Grant No 60532090), and the National Natural Science Foundation of China (Grant No 60771048).

Studying a kind of portable ultra-bright microfocus x-raysource

Wang Kai-Ge(王凯歌)a)b), Wang Lei(王雷)c), and Niu Han-Ben(牛憨笨)b)†   

  1. a Institute of Photonics & Photonic Technology, Northwest University, Xi'an 710069, China; b Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China; c Xi'an Institute of Applied Optics, Xi'an 710065, China
  • Received:2008-09-19 Revised:2008-10-15 Online:2009-05-20 Published:2009-05-20
  • Supported by:
    Project supported by the Major Program of the National Natural Science Foundation of China (Grant No 60532090), and the National Natural Science Foundation of China (Grant No 60771048).

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摘要： This paper studies the properties of a kind of portable ultra-bright microfocus x-ray source with the Monte-Carlo method in detail. The new x-ray source consists of an electron-emission system, an electrostatic focusing system and a metal target. A crystal Lanthanum Hexaboride cathode, a Wehnelt grid and an extracted electrode compose the triode electrode electron-gun system. Two equal radius cylinder electrodes form the focusing system. The key factors determining the focus properties of the electron beam such as the ratio Dw/H, grid bias Vg, and the properties of the extracted electrode are numerically studied. The calculated results reveal that when Dw/H, Vg, the length of the extracted electrode, and the distance between the grid and the extracted electrode equals 5, --0.6~kV, 10~mm, and 8~mm respectively, the electron beam focal spot can be concentrated down to 9~μm in radius and a reasonable focal length about 72.5~mm can be achieved, at the same time, the cathode emission currents can be as high as 30~mA.

关键词: microfocus x-ray source, high brightness, micro-focal spot, Monte-Carlo method

Abstract: This paper studies the properties of a kind of portable ultra-bright microfocus x-ray source with the Monte-Carlo method in detail. The new x-ray source consists of an electron-emission system, an electrostatic focusing system and a metal target. A crystal Lanthanum Hexaboride cathode, a Wehnelt grid and an extracted electrode compose the triode electrode electron-gun system. Two equal radius cylinder electrodes form the focusing system. The key factors determining the focus properties of the electron beam such as the ratio Dw/H, grid bias Vg, and the properties of the extracted electrode are numerically studied. The calculated results reveal that when Dw/H, Vg, the length of the extracted electrode, and the distance between the grid and the extracted electrode equals 5, --0.6 kV, 10 mm, and 8 mm respectively, the electron beam focal spot can be concentrated down to 9 μm in radius and a reasonable focal length about 72.5 mm can be achieved, at the same time, the cathode emission currents can be as high as 30 mA.

Key words: microfocus x-ray source, high brightness, micro-focal spot, Monte-Carlo method

中图分类号:  (Electron and positron beams)

  • 41.75.Fr
41.85.Lc (Particle beam focusing and bending magnets, wiggler magnets, and quadrupoles) 41.50.+h (X-ray beams and x-ray optics) 07.85.Fv (X- and γ-ray sources, mirrors, gratings, and detectors)