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

• • 上一篇    下一篇

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).

PDF (PC)

584

赞

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)