PRODUCTION OF MEV PHOTONS BY THE LASER COMPTON SCATTERING USING A FAR INFRARED LASER AT SPRING-8*
PRODUCTION OF MEV PHOTONS BY THE LASER COMPTON SCATTERING USING A FAR INFRARED LASER AT SPRING-8*
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
H. Ohkuma;M. Shoji;Shinsuke Suzuki;K. Tamura;T. Yorita;K. Nakayama;S. Okajima;K. Kawase;M. Fujiwara
中科院分区：
文献类型：
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作者：
H. Ohkuma;M. Shoji;Shinsuke Suzuki;K. Tamura;T. Yorita;K. Nakayama;S. Okajima;K. Kawase;M. Fujiwara
为了利用激光康普顿散射（LCS）产生MeV光子（γ射线），在SPring-8研制了一台高功率光泵远红外（FIR）激光器。用CO_2激光的9 P（36）分支线泵浦CH_3OH 119 μm激光，获得了1.6W的远红外激光输出。在SPring 8储存环的情况下，动量接受是如此之大（± 200 MeV），以至于康普顿散射电子被重新加速。因此，存储的波束不会被LCS过程丢失。束诊断束线I（BL 38 B2）用于将FIR激光束注入到8 GeV存储电子束上，并提取LCS产生的MeV光子。将介绍远红外激光系统、兆电子伏光子产生系统和测量的兆电子伏光子谱。在输出功率为890 mW的远红外激光器条件下，激光束产生MeV光子的速率约为103光子/秒。未来的计划也将出台。为了产生更高强度的MeV光子，我们正在另一条光束诊断光束线（BL 05 SS）上建造一个新的MeV光子产生系统。
In order to produce MeV photons (γ-ray) by the laser Compton scattering (LCS), a high power optically pumped far infrared (FIR) laser has been developed at SPring-8. We obtained about 1.6 W of maximum output power of FIR laser at CH3OH 119 μm lasing line pumped by 9P(36) branch line of CO2 laser. In case of the SPring8 storage ring, the momentum acceptance is so large (± 200 MeV) that the Compton scattered electron is reaccelerated. Therefore, the stored beam is not lost by the LCS process. The beam diagnostics beamline I (BL38B2) is used to inject a FIR laser beam against 8 GeV stored electron beam and to extract MeV photons produced by LCS. The FIR laser system, MeV photons production system, and measured MeV photons spectrum will be presented. Production rate of MeV photons by LCS was estimated to be the order of 10 3 photons/sec with 890 mW output power of FIR laser. Future plans will also be introduced. In order to produce higher intense MeV photons, we are constructing a new MeV photons production system at another beam diagnostics beamline (BL05SS).