Luo W, Xu W, Pan Q Y, Cai X Z, Chen J G, Chen Y Z, Fan G T, Fan G W, Guo W, Li Y J, Liu W H, Lin G Q, Ma Y G, Shen W Q, Shi X C, Xu B J, Xu J Q, Xu Y, Zhang H O, Yan Z, Yang L F, Zhao M H
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.
Rev Sci Instrum. 2010 Jan;81(1):013304. doi: 10.1063/1.3282445.
As a prototype of the Shanghai Laser Electron Gamma Source in the Shanghai Synchrotron Radiation Facility, an x-ray source based on laser-Compton scattering (LCS) has been installed at the terminal of the 100 MeV linac of the Shanghai Institute of Applied Physics. LCS x-rays are generated by interactions between Q-switched Nd:yttrium aluminum garnet laser pulses [with wavelength of 1064 nm and pulse width of 21 ns (full width at half maximum)] and electron bunches [with energy of 108 MeV and pulse width of 0.95 ns (rms)] at an angle of 42 degrees between laser and electron beam. In order to measure the energy spectrum of LCS x-rays, a Si(Li) detector along the electron beam line axis is positioned at 9.8 m away from a LCS chamber. After background subtraction, the LCS x-ray spectrum with the peak energy of 29.1+/-4.4|(stat)+/-2.1|(syst) keV and the peak width (rms) of 7.8+/-2.8|(stat)+/-0.4|(syst) keV is observed. Normally the 100 MeV linac operates with the electron macropulse charge of 1.0 nC/pulse, and the electron and laser collision repetition rate of 20 Hz. Therefore, the total LCS x-ray flux of (5.2+/-2.0) x 10(2) Hz can be achieved.
作为上海同步辐射装置中上海激光电子伽马源的原型，一个基于激光康普顿散射（LCS）的X射线源已安装在上海应用物理研究所100 MeV直线加速器的终端。LCS X射线是由调Q钕钇铝石榴石激光脉冲（波长为1064 nm，脉冲宽度为21 ns（半高宽））与电子束团（能量为108 MeV，脉冲宽度为0.95 ns（均方根））在激光与电子束夹角为42度时相互作用产生的。为了测量LCS X射线的能谱，一个沿电子束线轴的Si(Li)探测器放置在距LCS腔9.8 m处。扣除本底后，观察到LCS X射线谱的峰值能量为29.1±4.4|(统计)+/-2.1|(系统) keV，峰值宽度（均方根）为7.8±2.8|(统计)+/-0.4|(系统) keV。通常100 MeV直线加速器以1.0 nC/脉冲的电子宏脉冲电荷量和20 Hz的电子与激光碰撞重复率运行。因此，可实现的LCS X射线总通量为(5.2±2.0)×10(2) Hz。
