On the universality of nonthermal electron acceleration due to quasi-turbulent wakefields

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題名:	On the universality of nonthermal electron acceleration due to quasi-turbulent wakefields
作者:	陳仕宏;Kuramitsu, Yasuhiro;Sakawa, Youich;Hoshino, Masahiro;Chen, Shih-Hung;Takabe, Hideaki
貢獻者:	理學院物理學系
關鍵詞:	Particle acceleration;Plasmas;Relativity;Turbulence;Waves
日期:	2012-09-01
上傳時間:	2026-04-23 12:36:17 (UTC+8)
出版者:	Elsevier B.V
摘要:	摘要： Nonthermal acceleration of relativistic electrons in a wakefield induced by large amplitude light waves is discussed. It is considered that large amplitude light waves are excited as the precursor waves in the upstream of relativistic perpendicular shocks in the universe, and that the wakefield is excited by the light ponderomotive force. Thus, the wakefield acceleration is possible in the astrophysical circumstances. We model such shock environments in a laboratory plasma by substituting an intense laser pulse for the large amplitude light waves. By performing 2-D particle-in-cell simulations, we discuss the properties of the wakefield acceleration in various laser and plasma conditions. With the relativistic intensities of the laser pulses, the electrons are nonthermally accelerated by the wakefield. When the pulse length and the spot size are comparable to the electron inertial scale, the energy distribution functions of the electrons can be monoenergetic. On the other hand, when the pulse spatial scales are much larger than the electron inertial scale, which occurs in the case of the shock precursor light waves, the distribution functions are universally represented by power law spectra with an index of 2, independent of the laser intensity, the plasma density, and the laser pulse size. 出版者： Elsevier B.V 出版日期： 2012-09 出處： High Energy Density Physics, 2012-09, Vol.8 (3), p.266-270 版權： 2012 Elsevier B.V. 識別號： ISSN: 1574-1818 識別號： EISSN: 1878-0563 識別號： DOI: 10.1016/j.hedp.2012.03.016
顯示於類別:	[物理學系] 期刊論文

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