摘要
Monochromatic x-ray imaging is an essential method for plasma diagnostics related to density information.Large-field high-resolution monochromatic imaging of a He-like iron(Fe XXV)Kαcharacteristic line(6.701 keV)for laser plasma diagnostics was achieved using a developed toroidal crystal x-ray imager.A high-index crystal orientation Ge(531)wafer with a Bragg angle of 75.37°and the toroidal substrate were selected to obtain sufficient diffraction efficiency and compensate for astigmatism under oblique incidence.A precise offline assembly method of the toroidal crystal imager based on energy substitution was proposed,and a spatial resolution of 3-7μm was obtained by toroidal crystal imaging of a 600 line-pairs/inch Au grid within an object field of view larger than 1.0 mm.The toroidal crystal x-ray imager has been successfully tested via side-on backlight imaging experiments of the sinusoidal modulation target and a 1000 line-pairs/inch Au grid with a linewidth of 5μm using an online alignment method based on dual positioning balls to indicate the target and backlighter.This paper describes the optical design,adjustment method,and experimental results of a toroidal crystal system in a laboratory and laser facility.
作者
司昊轩
董佳钦
方智恒
蒋励
伊圣振
王占山
Haoxuan SI;Jiaqin DONG;Zhiheng FANG;Li JIANG;Shengzhen YI;Zhanshan WANG(MOE Key Laboratory of Advanced Micro-Structured Materials,Tongji University,Shanghai 200092,People's Republic of China;School of Physics Science and Engineering,Tongji University,Shanghai 200092,People's Republic of China;Shanghai Institute of Laser Plasma,China Academy of Engineering Physics,Shanghai 201800,People's Republic of China)
基金
National Natural Science Foundation of China(No.11805212)
National Key Research and Development Program of China(No.2019YFE03080200)。
