Laser-produced plasma helium-like titanium Kα x-ray source and its application to Rayleighben-Taylor instability study

doi:10.1088/1674-1056/19/7/075202

中国物理B ›› 2010, Vol. 19 ›› Issue (7): 75202-075202.doi: 10.1088/1674-1056/19/7/075202

Laser-produced plasma helium-like titanium Kα x-ray source and its application to Rayleighben-Taylor instability study

王伟¹, 董佳钦¹, 陈伟民², 肖沙里², 王瑞荣³

(1)State Key Laboratory of High Power Laser and Physics, Shanghai Institute of Laser Plasma, Shanghai 201800, China; (2)The Key Laboratory of Optoelectronic Technology and System, Ministry of Education, Chongqing University, Chongqing 400044, China; (3)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

出版日期:2010-07-15 发布日期:2010-07-15
基金资助:
Project supported by the National High Technology Development Program of China (Grant No. 2009AA8046006).

Laser-produced plasma helium-like titanium K$\alpha$ x-ray source and its application to Rayleighben-Taylor instability study

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

^a The Key Laboratory of Optoelectronic Technology and System, Ministry of Education, Chongqing University, Chongqing 400044, China; ^b ; State Key Laboratory of High Power Laser and Physics, Shanghai Institute of Laser Plasma, Shanghai 201800, China

Online:2010-07-15 Published:2010-07-15
Supported by:
Project supported by the National High Technology Development Program of China (Grant No. 2009AA8046006).

摘要/Abstract

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 ξ_x 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.

Abstract: 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 K$\alpha$ 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 K$\alpha$ source from a simple foil target is larger than 100 μm, and relative x-ray line emission conversion efficiency $\xi_{\rm x}$ 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.

Key words: x-ray source, plasma diagnostic techniques, x-ray spectra

中图分类号: (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))

52.50.Jm

52.50.Dg (Plasma sources) 52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)) 52.25.Os (Emission, absorption, and scattering of electromagnetic radiation ?) 52.70.La (X-ray and γ-ray measurements) 52.58.-c (Other confinement methods)

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.

Wang Rui-Rong (王瑞荣), Chen Wei-Min (陈伟民), Wang Wei (王伟), Dong Jia-Qin (董佳钦), Xiao Sha-Li (肖沙里). Laser-produced plasma helium-like titanium K$\alpha$ x-ray source and its application to Rayleighben-Taylor instability study[J]. Chin. Phys. B, 2010, 19(7): 75202-075202.

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Laser-produced plasma helium-like titanium Kα x-ray source and its application to Rayleighben-Taylor instability study

Laser-produced plasma helium-like titanium K$\alpha$ x-ray source and its application to Rayleighben-Taylor instability study

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