Inverse Compton scattering from solid targets irradiated by ultra-short laser pulses in the 1022–1023 W/cm2 regime
Inverse Compton scattering from solid targets irradiated by ultra-short laser pulses in the 1022–1023 W/cm2 regime
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DOI：
10.1088/1361-6587/ab83cb
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发表时间：
2019-12
影响因子：
2.2
通讯作者：
J. Vyskočil;E. Gelfer;O. Klimo
中科院分区：
文献类型：
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作者：
J. Vyskočil;E. Gelfer;O. Klimo
采用粒子模拟方法研究了超强激光脉冲与薄固体薄膜相互作用中通过非线性逆康普顿散射过程（ICS）产生的高能γ射线辐射。结果表明，ICS光子的角分布具有以角度θ =± 30°为中心的前向双向结构，该值对应于基于驻波近似的目标前方电磁场的模型，该模型仅在最高强度处增加，这是由于更快的钻孔，这使得近似无效。转换效率随驱动脉冲强度呈超线性增加。通过电子核韧致辐射的发射相比，它表明，更高的吸收，更快的钻孔进一步增强，在具有较低的原子序数的目标强烈有利于ICS过程。
Emission of high energy gamma rays via the non-linear inverse Compton scattering process (ICS) in interactions of ultra-intense laser pulses with thin solid foils is studied using particle-in-cell simulations. It is shown that the angular distribution of the ICS photons has a forward-oriented two-directional structure centred at an angle ϑ =± 30°, a value which corresponds to a model based on a standing wave approximation to the electromagnetic field in front of the target, which only increases at the highest intensities due to faster hole boring, which renders the approximation invalid. The conversion efficiency is shown to exhibit a super-linear increase with the driving pulse intensity. In comparison to emission via electron-nucleus bremsstrahlung, it is shown that the higher absorption, further enhanced by faster hole boring, in the targets with lower atomic number strongly favours the ICS process.