中国物理B ›› 2010, Vol. 19 ›› Issue (7): 75202-075202.doi: 10.1088/1674-1056/19/7/075202
王伟1, 董佳钦1, 陈伟民2, 肖沙里2, 王瑞荣3
Wang Rui-Rong (王瑞荣)ab, Chen Wei-Min (陈伟民)a, Wang Wei (王伟)b, Dong Jia-Qin (董佳钦)b, Xiao Sha-Li (肖沙里)a
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.
中图分类号: (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))