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

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

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.

Keywords: x-ray source plasma diagnostic techniques x-ray spectra

Accepted manuscript online:

PACS:	52.50.Jm	(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
	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)

Fund: Project supported by the National High Technology Development Program of China (Grant No. 2009AA8046006).

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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 2010 Chin. Phys. B 19 075202

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

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