Suppression effects of Weibel instability for fast electron divergence
1 Fundamental Physics Simulation Div., National Inst. for Fusion Science, Toki 509-5292, Japan
2 Graduate school of Engineering, Hiroshima University, Higashihiroshima 739-8511, Japan
3 Dept. of Electrical and Electronic Eng., Setsunan University, Neyagawa 572-8508, Japan
4 Institute of Laser Engineering, Suita 565-0871, Japan
a e-mail: firstname.lastname@example.org
Published online: 15 November 2013
Quasi-static magnetic fields, which are induced by the Weibel instability and grow to more than hundred Megagauss, lead to large divergence angle of fast electrons, hence lower energy coupling. To suppress the divergence, two different structures, namely density trough and punched out holes, are introduced to targets. In the density trough target, the Weibel instability is enhanced and the divergence is getting worse. On the other hand, the divergence angle is improved but the number of electrons is degraded for fast electrons (<3 MeV) in the punched out target.
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