Dependence of resistivity gradient guiding of laser-driven relativistic electron beams on laser intensity and duration
Dependence of resistivity gradient guiding of laser-driven relativistic electron beams on laser intensity and duration
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DOI：
10.1063/5.0101615
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发表时间：
2022-11
影响因子：
2.2
通讯作者：
T. Johzaki;K. Yoshitake;T. Endo;W. Kim;S. Fujioka;H. Nagatomo;H. Morita;R. Takizawa;M. Takemura
中科院分区：
文献类型：
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作者：
T. Johzaki;K. Yoshitake;T. Endo;W. Kim;S. Fujioka;H. Nagatomo;H. Morita;R. Takizawa;M. Takemura
激光驱动的相对论电子束（REB）具有很大的束发散角。为了通过REB有效地加热材料，例如，快速点火中的芯加热，通过抑制垂直方向上的空间发散以保持其强度足够高而将光束从其产生点引导到待加热的加热材料是必不可少的。我们评估了电阻率梯度引导方案中REB引导性能的依赖性[A. P. L.罗宾逊和M. Sherlock，“Magnetic collimation of fast electrons produced by ultraintensive laser irradiation by structuring the target composition，”Phys.Plasmas 14，083105（2007）]关于激光强度和持续时间，从目前的拍瓦激光参数到快速点火相关的激光参数，就REB的电阻率和能量沉积的温度依赖性而言。对固体材料中REB输运的模拟表明，对于快点火激光条件，镍柱作为导引材料，在100 μm的传输距离下，REB输运效率可达40%。模拟结果表明，电阻梯度引导方案是提高堆芯加热效率的可能方案之一。
A laser-driven relativistic electron beam (REB) has a large beam divergence. For the efficient heating of material by REB, for example, core heating in fast ignition, beam guiding from its generation point to the heating material to be heated by suppressing spatial divergence in a perpendicular direction to keep its intensity sufficiently high is indispensable. We evaluated the dependences of the REB guiding performance in the resistivity gradient guiding scheme [A. P. L. Robinson and M. Sherlock, “Magnetic collimation of fast electrons produced by ultraintense laser irradiation by structuring the target composition,” Phys. Plasmas 14, 083105 (2007)] on laser intensity and duration, from the present petawatt laser parameters to the fast ignition-relevant laser parameters, in terms of the temperature dependence of resistivity and energy deposition of the REB. The REB transport simulations in solid materials show that for a fast ignition-relevant laser condition, a nickel cylinder works as a guiding material; an REB transport efficiency of 40% is obtained for a 100- μm propagation. The simulation results show that the resistive gradient guiding scheme is one of possible candidates for improving core heating efficiency.