全光汤姆逊散射X光源数值模拟
Numerical simulation of full-optical Thomson scattering X-ray source
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摘要: 使用蒙特卡罗数值模拟程序研究了不同电子束和激光强度下，尾场电子束与超短脉冲激光发生汤姆逊散射获得的X光子能谱、角分布等，初步探索了180°散射下高质量X射线光源所需要的电子束与激光强度。数值模拟结果显示，为了尽量提高光子产额并抑制非线性效应，激光归一化强度应为1的量级。为了获得方向性和单色性好、亮度高的X射线脉冲，需要较高的电子能量和较小的电子能散，电子束脉冲尽量短，且发散角尽量小。Abstract: The energy spectra and angle-distribution of the X-ray photons produced through 180°Thomson scattering were studied by Monte Carlo numerical simulation code CAIN. The laser intensity and electron parameters required for high quality X-ray source were also explored. Results show that to get higher photon production and suppress the nonlinear scattering, the laser intensity should not be too high. To get a monochromatic and highly luminous X-ray source, the electrons should have quasi-monoenergetic energy distributions, high energy, small divergence and short pulse length.
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Key words:
- ultrashort laser /
- wakefield acceleration /
- thomson scattering /
- x-ray source
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