外文题目: Study of channel formation and relativistic ultra-short laser pulse propagation in helium plasma
作者: Yu, Changhai; Tian, Ye; Li, Wentao; Zhang, Zhijun; Qi, Rong; Wang, Wentao; Wang, Cheng; Liu, Jiansheng
刊名: Plasma Phys. Control. Fusion
年: 2016 卷: 58 期: 5 文章编号：55007
英文关键词:
self-focusing; filamentation in plasmas; laser light absorption in plasmas; channeling
PREFORMED PLASMA; OVERDENSE PLASMA; ACCELERATION; EVOLUTION; IGNITION; JET
英文摘要:
In this study, plasma channel formation in pure He plasma (ionization electron density 0.01-0.1n(c)) interacting with ultra-short relativistic laser pulses (50 fs, >10(19) W cm(-2)) was observed and analyzed. By appropriately selecting the laser pulse and gas backing pressure of the gas jet, a clear density channel longer than 300 mu m and wider than 25 mu m was achieved in less than 1.5 ps following the passage of the laser pulse, with a radial electron density gradient of similar to 10(23) cm(-4) at the channel walls. Numerical simulations for studying the affects of the plasma density, kinetic motion of electrons and ions, and nonlinear laser propagation on the plasma channel formation were carried out, which reproduced the experimental features. These density channels were mainly driven by the radial expulsion of plasma ions, with strong continuous laser self-focusing acting to improve the channeling efficiency. These channels can guide the propagation of ultra-intense laser pulses and supply several advanced applications in high-energy physics, including fast-ignition inertial confinement fusion, plasma-based particle accelerations, and sources of radiation.


文献类型: 期刊论文
正文语种: English
收录类别: SCIEI
DOI: 10.1088/0741-3335/58/5/055007


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