Improving performance of inverse Compton sources through laser chirping
Improving performance of inverse Compton sources through laser chirping
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DOI：
10.1209/0295-5075/126/12003
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发表时间：
2019-02
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通讯作者：
Balvsa Terzi'c;Geoffrey Krafft;A. Brown;T. Hagerman;E. Johnson;V. Petrillo;I. Drebot;C. Maroli;M. Ruijter
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作者：
Balvsa Terzi'c;Geoffrey Krafft;A. Brown;T. Hagerman;E. Johnson;V. Petrillo;I. Drebot;C. Maroli;M. Ruijter
本文提出了一种新的计算高强度反康普顿源非线性工作区辐射谱的方法。模拟结果与实验结果吻合较好。增加激光强度会改变电子在碰撞过程中的纵向速度，导致散射辐射光谱的非线性加宽。这种有质动力展宽的影响是如此有害，以至于大多数逆康普顿源要么保持在低激光强度，要么付出高昂的代价以在物理上可能的峰值光谱输出的一小部分下工作。这种有质动力加宽可以通过入射激光脉冲的合适的频率调制（也称为“啁啾”，其不一定是线性的）来减少，从而显著增加峰值光谱密度。这种频率调制，包括在新的代码作为一个可选的功能，用于模拟，以激励实验实施这种变革性的技术。
We present a new method for computation of radiation spectra in the non-linear regime of operation of inverse Compton sources characterized by high laser intensities. The resulting simulations agree well with the experiments. Increasing the laser intensity changes the longitudinal velocity of the electrons during their collision, leading to considerable non-linear broadening in the scattered radiation spectra. The effects of such ponderomotive broadening are so deleterious that most inverse Compton sources either remain at low laser intensities or pay a steep price to operate at a small fraction of the physically possible peak spectral output. This ponderomotive broadening can be reduced by a suitable frequency modulation (also referred to as “chirping”, which is not necessarily linear) of the incident laser pulse, thereby drastically increasing the peak spectral density. This frequency modulation, included in the new code as an optional functionality, is used in simulations to motivate the experimental implementation of this transformative technique.