Laser-produced plasma helium-like titanium Kα x-ray source and its application to Rayleighben-Taylor instability study |
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引用本文: | 王瑞荣,陈伟民,王伟,董佳钦,肖沙里.Laser-produced plasma helium-like titanium Kα x-ray source and its application to Rayleighben-Taylor instability study[J].中国物理 B,2010,19(7):75202-075202. |
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作者姓名: | 王瑞荣 陈伟民 王伟 董佳钦 肖沙里 |
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作者单位: | The Key Laboratory of Optoelectronic Technology and System, Ministry of Education, Chongqing University, Chongqing 400044, China;State Key Laboratory of High Power Laser and Physics,
Shanghai Institute of Laser Plasma, Shanghai 201800, China;The Key Laboratory of Optoelectronic Technology and System, Ministry of Education, Chongqing University, Chongqing 400044, China;State Key Laboratory of High Power Laser and Physics, Shanghai Institute of Laser Plasma, Shanghai 201800, China;State Key Laboratory of High Power Laser and Physics, Shanghai Institute of Laser Plasma, Shanghai 201800, China;The Key Laboratory of Optoelectronic Technology and System, Ministry of Education, Chongqing University, Chongqing 400044, China |
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基金项目: | Project supported by the National High Technology Development Program of China (Grant No. 2009AA8046006). |
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摘 要: | Several experiments are performed on the ShenGuang-II laser facility to investigate an x-ray source and test radiography concepts. X-ray lines emitted from laser-produced plasmas are the most practical means of generating these high intensity sources. By using a time-integrated space-resolved keV spectroscope and pinhole camera, potential helium-like titanium Kα x-ray backlighting (radiography) line source is studied as a function of laser wavelength, ratio of pre-pulse intensity to main pulse intensity, and laser intensity (from 7.25 to ~11.3× 1015 W/cm2). One-dimensional radiography using a grid consisting of 5 μm Au wires on 16 μm period and the pinhole-assisted point projection is tested. The measurements show that the size of the helium-like titanium Kα source from a simple foil target is larger than 100 μm, and relative x-ray line emission conversion efficiency ξx from the incident laser light energy to helium-like titanium K-shell spectrum increases significantly with pre-pulse intensity increasing, increases rapidly with laser wavelength decreasing, and increases moderately with main laser intensity increasing. It is also found that a gold gird foils can reach an imaging resolution better than 5-μm featured with high contrast. It is further demonstrated that the pinhole-assisted point projection at such a level will be a novel two-dimensional imaging diagnostic technique for inertial confinement fusion experiments.
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