Generation of laser Compton gamma-rays in the SAGA light source storage ring
Generation of laser Compton gamma-rays in the SAGA light source storage ring
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SAGA光源存储环中产生激光康普顿伽马射线
DOI：
10.1016/j.nima.2011.08.047
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发表时间：
2011
影响因子：
1.4
通讯作者：
S. Koda
中科院分区：
文献类型：
--
作者：
T. Kaneyasu;Y. Takabayashi;Y. Iwasaki;S. Koda
GeV级中等规模同步辐射光源配备红外高功率激光器，通过激光康普顿散射可以产生稳定的高通量数MeV γ射线。我们在佐贺光源储存环上建立了一套高通量γ射线产生的实验装置。1.4GeV的电子束与波长为10.6μm的激光光子之间的正面碰撞产生了最大能量为3.5MeV的伽马射线。由于激光康普顿散射不影响光束质量，因此这些伽马射线可以与用户时间一起产生，用于同步辐射研究。事件率设计为1.4×108s− 1，束流为300mA，激光功率为10 W。作为高通量伽马射线产生的第一步，我们在低束流下进行了束流测试，以评估伽马射线的特性。这些试验证实了在不减少射束寿命的情况下产生伽马射线。实验结果表明，有效γ射线通量接近设计值的40%。利用激光康普顿γ射线对储存环的机械参数进行了测量。通过分析能量范围在0.6至1.4GeV的储存束的伽马射线谱，成功地确定了束的能量，相对不确定度在10− 3的数量级。
A medium-scale synchrotron light source of GeV-class equipped with an infrared high-power laser can generate stable high-flux gamma-rays at several MeV via laser Compton scattering. We constructed an experimental setup for high-flux gamma-ray generation in the SAGA light source storage ring. A head-on collision between a 1.4GeV electron beam and laser photons with a 10.6μm wavelength produced gamma-rays up to a maximum energy of 3.5MeV. Since the laser Compton scattering does not influence the beam quality, these gamma-rays can be generated in conjunction with user time for synchrotron radiation research. The event rate was designed to be 1.4×108s−1with a beam current of 300mA and a laser power of 10 W. As a first step in high-flux gamma-ray generation, we performed beam tests at a low beam current to evaluate the characteristics of the gamma-rays. Gamma-ray generation with no reduction in beam lifetime was confirmed by these tests. The experimental results show that the effective gamma-ray flux was almost 40% of the design value. The laser Compton gamma-ray was also applied to measure the machine parameters of the storage ring. The beam energy was successfully determined with relative uncertainties on the order of 10−3by analyzing the gamma-ray spectrum for the stored beam, which ranged in energy from 0.6 to 1.4GeV.