Study on Energy Variable Laser-Compton Gamma-ray with a Fixed Energy Electron Beam
Study on Energy Variable Laser-Compton Gamma-ray with a Fixed Energy Electron Beam
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DOI：
10.1080/18811248.2007.9711858
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发表时间：
2007-05
影响因子：
1.2
通讯作者：
H. Ohgaki;S. Koda;Y. Iwasaki;Y. Takabayashi;Katsuhide Yoshida;T. Tomimasu;Y. Uozumi;K. Ishibashi
中科院分区：
文献类型：
--
作者：
H. Ohgaki;S. Koda;Y. Iwasaki;Y. Takabayashi;Katsuhide Yoshida;T. Tomimasu;Y. Uozumi;K. Ishibashi
中等尺度（1- 2GeV）同步辐射环中的电子束是产生MeV量级强而窄能散激光-康普顿γ射线束的理想光源。由于储存环的同步辐射（SR）用户的电子能量是固定的，改变γ射线能量的方法应进行调查。通过分析计算和模拟计算，研究了采用可调谐激光器、改变激光与电子束的碰撞角和利用准直器和吸收体选择激光与康普顿γ射线的散射角3种方法，并考虑了电子束的尺寸和激光与电子相互作用的有效长度。由于可调谐激光器在红外波段没有足够的功率，目前还不能产生强γ射线束。准直器-吸收器方法产生足够量的伽马射线，但模拟显示伽马射线的宽能量分布，约7%。通过改变脉冲宽度和定时与电子束脉冲同步的激光束的入射角，可以获得可接受的伽马射线束。
The electron beam in medium scale (1-2 GeV) synchrotron radiation ring is attractive to generate an intense and narrow energy spread of laser-Compton gamma-ray beam in an MeV-region. Since the storage ring is operated with fixed electron energy for synchrotron radiation (SR) users, methods for changing the gamma-ray energy should be investigated. Three methods, 1) using a tunable laser, 2) changing the collision angle between the laser and the electron beam, and 3) selecting the scattering angle of the laser-Compton gamma-ray by using a collimator and an absorber, are studied by analytical calculation and simulation which takes into account the electron beam size and effective length of laser-electron interaction. Since a tunable laser has no enough power in the infrared wavelength region, an intense gamma-ray beam can not be generated by using a tunable laser at present stage. The collimator-absorber method generates enough amounts of gamma-rays, but simulation shows a broad energy spread, -7%, of the gamma-ray. An acceptable gamma-ray beam can be obtained by changing the incident angle of the laser beam whose pulse width and timing are synchronized with the electron beam pulse.