介绍了Si-APD的工作原理并对Si-APD中的暗电流进行了理论分析.基于RIBLL上产生的放射性核束流,使用CsI(Tl)+Si-APD探测器对中能重离子进行了能量测试.测试结果显示,CsI(Tl)+Si-APD探测器测量20 MeV/u的重离子时,可得到3%的能量分辨;同时还发现Si-APD中的暗电流大小以及入射粒子的能量大小都会对探测器的能量分辨产生影响.
In this paper, the working principle of Si-APD was introduced and the dark current of Si-APD was analyzed theoretically. The intermediate energy heavy ions, which are produced on the RIBLL(Radioactive Ion Beam Line in Lanzhou), were measured with CsI(Tl)+Si-APD detector. The energy resolution of CsI(Tl)+Si-APD detector is about 3% for heavy ions with energy around 20 MeV/u. It is also found that the energy resolution of detector can be influenced by the dark current of Si-APD and the energy of incident particles.
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