Theoretical study of Ni-like Ag 13.9nm TCE x-ray laser driven by two picosecond pulses |
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| Authors: | Qiao Xiu-Mei and Zhang Guo-Ping |
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| Affiliation: | Institute of Applied Physics and Computational Mathematics, Beijing 100088,China |
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| 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. |
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| Keywords: | x-ray laser transient collisional excitation (TCE) gain |
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