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Using the condenser lens to obtain a high brightness source of soft X-ray technology

Author: ChenDingYang
Tutor: XuZePing
School: Chinese Academy of Engineering Physics
Course: Nuclear Energy Science and Engineering
Keywords: X-ray lens buncher X-ray tube Transmission efficiency High power density soft X-ray Z-pinch
CLC: O434.19
Type: Master's thesis
Year: 2008
Downloads: 73
Quote: 0
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Abstract


Soft X-ray photon energy usually from 50 ~ 1500 eV, 0.83 ~ 24.8 nm wavelength range of electromagnetic waves. High brightness soft X-ray source in the study of soft X-ray and physical role and the establishment of black material ablation chamber model and other applications are huge, it can be better used to calibrate the soft X-ray detection systems, instruments and detection components. So the world are actively establish higher brightness laboratory soft X-ray source. This paper is to design based on Z-pinch plasma radiation source condenser lens, a lens for the X-ray collection, transfer, and convergence to achieve high brightness of soft X-ray source, and the lens is a soft X-ray high power density incident conditions, the transmission characteristics were studied. X-ray tube is a condenser lens of the basic unit. Existing domestic research on the X-ray tube in the power density of the incident X-rays with lower Beijing Synchrotron Radiation Facility 3W1B radiation beam lines, and on the other, in order to design for high power density of soft X-ray transmission and converging lens , first at the Institute of Nuclear Technology \The transmission characteristics were studied. The results show that: for the glass material drawn DM308 Model X-ray tube, it has a high power density of the soft X-rays have a high transmission efficiency, soft X-rays when the incident power density of 1.2 × 10 ~ 7W / cm ~ 2, X-ray tube bending angle of 5 to 0, the experiment to obtain the average transmission efficiency of up to 16.3%. In the 6 × 10 ~ 6 ~ 1.5 × 10 ~ 7W/cm ~ 2 a power density range, the soft X-ray tube in the X-ray transmission of the nonlinear effect does not appear, as the incident power density of soft X-rays to improve , the soft X-rays emitted from a substantially linear increase in power density. For the Z-Pinch radiation, the incident power density of soft X-ray 1 × 10 ~ 8W/cm ~ 2, the soft X-rays and plasma sputter material will not damage the X-ray tube. Based on the above findings, the numerical simulation method to optimize the design parameters of the lens, the lens obtained optimum design parameters: the 2401 inner diameter 0.45 mm, 0.60 mm outer diameter composed of an X-ray tube, the inlet end from Z-pinch bull's-eye distance of 200 mm, center length 410 mm, rear focal length of 50 mm. Assuming Z-pinch plasma radiation source is a light emitting zone length 20 mm, the radiation X-ray energy E = 1keV, peak power of 0.5 TW, the combination of the lens and the radiation source, after the numerical simulation of the focal point of the lens can be obtained focal spot diameter is 2.5 mm average power density of 8.96 × 10 ~ 8W/cm ~ 2 of the soft X-ray transmission efficiency of the lens of 11.71%. The lens made of the Z-pinch plasma radiation combination after the actual focal length of the lens 62mm, when the source of the soft X-ray radiation, the peak power of 0.5 TW, the soft X-ray focusing lens of the transmission efficiency was 9.58%, the power density gain is 131 times the equivalent distance of 58.8 mm. After the lens focus (from wire array bull's-eye 672 mm) can be obtained power density of 1.15 × 10 ~ 9W/cm ~ 2 focal spot diameter of 2mm cleaner soft X-ray source. While continuing to work the lens can be in Z-pinch device up to obtain a soft X-ray source.

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CLC: > Mathematical sciences and chemical > Physics > Optics > X-ray,ultraviolet, infrared > X-ray > Application
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