期刊
PHYSICS OF PLASMAS
卷 17, 期 5, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3323083
关键词
gas mixtures; helium; high-speed optical techniques; ionisation; optical self-focusing; oxygen; plasma density; plasma light propagation; plasma simulation
资金
- Direct For Mathematical & Physical Scien
- Division Of Physics [GRANTS:13904385, 0904039] Funding Source: National Science Foundation
Experiments conducted using a 200 TW 60 fs laser have demonstrated up to 720 MeV electrons in the self-guided laser wakefield regime using pure helium gas jet targets. The self-trapped charge in a helium plasma was shown to fall off with decreasing electron density with a threshold at 2.5x10(18) cm(-3), below which no charge is measured above 100 MeV. Self-guiding, however, is shown to continue below this density limitation over distances of 14 mm with an exit spot size of 25 mu m. Simulations show that injection of electrons at these densities can be assisted through ionization induced trapping in a mix of helium with 3% oxygen. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3323083]
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