Generation of hemispherical fast electron waves in the presence of preplasma in ultraintense laser-matter interaction
Generation of hemispherical fast electron waves in the presence of preplasma in ultraintense laser-matter interaction
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超强激光-物质相互作用中前等离子体存在时产生半球形快电子波
DOI：
10.1017/s0263034613000359
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发表时间：
2013-09
影响因子：
0.9
通讯作者：
Borghesi, M.
中科院分区：
文献类型：
--
作者：
Yu, M. Y.;Yin, Y.;Zhuo, H. B.;Borghesi, M.
用粒子模拟方法研究了超强激光与具有亚临界预等离子体的固体靶相互作用产生的半球形电子等离子体波。当激光脉冲在预等离子体中传播时，由于等离子体电子对有质动力的响应，激光脉冲变得自聚焦。电子主要通过电子共振吸收被加热，其热能可以变得高于有质动能。热电子很容易穿透薄的固体靶，并出现在它后面，作为周期性的半球形壳层，由激光波长分开。关键词：Betatron共振;电子等离子体波;有质动力;预等离子体引言在超强激光-固体相互作用中的快速电子产生已经在理论和实验上得到了广泛的研究（Sentoku等人，2006;Kempet等人，2009;Nilson等人，2011），因为它们在激光等离子体加速器中的应用（Borghesi等人，2006;Yuet等人，2009年;Yang等人，2010），惯性约束聚变的快速点火（FI）方案（Tabak等人，1994;多伊奇和Didelez，2011），明亮的X射线源（Pfeifer等人，高能电子的能谱、空间分布和发散角会受到由固有激光预脉冲和/或来自激光系统的自发发射产生的无处不在的低密度吹离等离子体（预等离子体）的显著影响（Nuteret等人，2008年; Davidal.，2009; MacPhee等人，2010; Cai等人，2010;Linet等人，2012;Sakagami等人，2012年）。因此，在研究强激光与固体靶相互作用产生快电子时，应考虑预等离子体的影响。强激光脉冲与具有大预等离子体的固体靶相互作用可涉及到诸如自聚焦、折射、钻孔等非线性过程，这些过程在快电子的产生和传播中起着重要作用（Pukhov & Meyer-ter-Vehn et al.，1996年;Friouetal.，在预等离子体中也会产生快速电子，并且已经发现它们通常具有双温度麦克斯韦分布。高能成分的温度比有质动能高得多（Wilksetal.，1992年）和它的规模与长度L
AbstractHemispherical electron plasma waves generated from ultraintense laser interacting with a solid target having a subcriticalpreplasma is studied using particle-in-cell simulation. As the laser pulse propagates inside the preplasma, it becomes self-focused due to the response of the plasma electrons to the ponderomotive force. The electrons are mainly heated viabetatron resonance absorption and their thermal energy can become higher than the ponderomotive energy. The hotelectrons easily penetrate through the thin solid target and appear behind it as periodic hemispherical shell-like layersseparated by the laser wavelength.Keywords: Betatron resonance; Electron plasma waves; Ponderomotive force; Preplasma INTRODUCTIONFast electrons generation in ultraintense laser-solid interactionhave been investigated extensively both theoretically andexperimentally (Sentoku et al., 2006;Kempet al., 2009;Nilson et al., 2011) because of their application in laser-plasma accelerators (Borghesi et al., 2006;Yuet al., 2009;Yang et al., 2010), fast ignition (FI) schemes of inertial con-finement fusion (Tabak et al., 1994; Deutsch & Didelez,2011), bright X-ray sources (Pfeifer et al., 2006), etc. Theenergy spectrum, spatial distribution, and divergence angleof the energetic electrons can be significantly affected by theubiquitous low-density blow-off plasma (the preplasma) cre-ated by the inherent laser prepulse and/or spontaneous emis-sions from the lasing system (Nuteret al., 2008;Davieset al.,2009; MacPhee et al., 2010;Caiet al., 2010;Linet al., 2012;Sakagami et al., 2012). Thus, the effect of the preplasmashould be taken into account in studies of fast electron gener-ation from intense laser-solid target interaction.Interaction of an intense laser pulse with a solid targethaving a large preplasma can involve nonlinear processessuch as self-focusing, filamentation, hole-boring, etc. thatcan play important roles in the generation and propagationof fast electrons (Pukhov & Meyer-ter-Vehn et al., 1996;Friouetal.,2012).Fastelectronsarealsogeneratedinthepre-plasma, and it has been found that they usually have a two-temperature Maxwellian distribution. The temperature of thehigh-energy component is much higher than the ponderomo-tiveenergy(Wilksetal.,1992)anditscaleswiththelengthL
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