Abstract The Ni-like Ag 13.9nm x-ray laser has been previously demonstrated that the higher gain near critical surface contributes little to the amplification of the x-ray laser because of severe refraction. In this paper, the transient collision excitation (TCE) Ni-like Ag 13.9nm x-ray laser is simulated, driven by two 3ps short pulse preceded by a 330ps long prepulse, optimization of the peak to peak delay time of the two short pulses is made to get the best results. Simulation indicates that by producing lowly ionized preplasma with smoothly varying electron density, it is possible to decrease electron density gradient in higher density region, and thus higher gains near this region could be utilized, and if the main short pulse is delayed by 900ps, local gains where electron density larger than ～ 4×1020cm-3 could be utilized.
Received: 06 April 2006
Revised: 08 October 2006
Accepted manuscript online:
(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
Fund: Project supported by National
High Technology Research and Development Program of China (Grant
No. 863-804-7-1).
Cite this article:
Qiao Xiu-Mei(乔秀梅) and Zhang Guo-Ping(张国平) Theoretical study of Ni-like Ag 13.9nm TCE x-ray laser driven by two picosecond pulses 2007 Chinese Physics 16 1370
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