用于单脉冲康普顿背散射的非线性等离子体后向反射器
A nonlinear plasma retroreflector for single pulse Compton backscattering
摘要：
康普顿散射X射线可以使用由单个超强激光脉冲和成形气体靶组成的配置来产生。气体目标结合了流体动力学形成的密度尖峰，其非线性地散射入射泵浦辐射，以产生反向传播的电磁摆动器。这种自生的摇摆器场康普顿散射来自在泵浦辐射的激光尾流场中加速的电子。为了优化康普顿散射辐射，对密度尖峰中的非线性散射机制进行了理论和数值研究。研究发现，窄带X射线是由中等强度的泵浦辐射入射到密度尖峰的四分之一临界表面上产生的，而高通量，宽带X射线是由高强度的泵浦辐射在临界表面附近反射产生的。
英文摘要：
Compton scattered x-rays can be generated using a configuration consisting of a single, ultra-intense laser pulse, and a shaped gas target. The gas target incorporates a hydrodynamically formed density spike, which nonlinearly scatters the incident pump radiation, to produce a counter-propagating electromagnetic wiggler. This self-generated wiggler field Compton scatters from electrons accelerated in the laser wakefield of the pump radiation. The nonlinear scattering mechanism in the density spike is examined theoretically and numerically in order to optimize the Compton scattered radiation. It is found that narrow-band x-rays are produced by moderate intensity pump radiation incident on the quarter-critical surface of the density spike, while high fluence, broadband x-rays are produced by high intensity pump radiation reflected near the critical surface.
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