平面LAAPD的温度特性、性能及其在低能X射线光谱学中的应用
Planar LAAPDs: Temperature Dependence, Performance, and Application in Low Energy X-ray Spectroscopy
摘要：
一项测量μ子氢分子中2S兰姆位移的实验正在瑞士的保罗·谢勒研究所进行。它需要小型和紧凑的探测器为1.9 keV的X射线（2 P-1 S过渡）的能量分辨率约25%，在2 keV，时间分辨率优于100 ns，一个大的立体角覆盖范围，和不敏感的5 T磁场。我们选用辐射监测仪器公司的大面积雪崩光电二极管（LAAPD）作为X射线探测器，并在2003年的最后一次数据采集期间使用。对于X射线光谱应用，这些LAAPD必须被冷却，以抑制暗电流噪声，因此，进行了一系列的测试，以选择最佳的操作温度。具体而言，增益，能量分辨率，暗电流，过量噪声因子和检测器响应线性度的温度依赖性进行了研究。最后，详细介绍了LAAPD在μ子氢实验中的应用以及它们对α粒子的响应。
英文摘要：
An experiment measuring the 2S Lamb shift in muonic hydrogen mup is being performed at the Paul Scherrer Institute, Switzerland. It requires small and compact detectors for 1.9 keV x rays (2P-1S transition) with an energy resolution around 25% at 2 keV, a time resolution better than 100 ns, a large solid angle coverage, and insensitivity to a 5 T magnetic field. We have chosen Large Area Avalanche Photodiodes (LAAPDs) from Radiation Monitoring Devices as x-ray detectors, and they were used during the last data taking period in 2003. For x-ray spectroscopy applications, these LAAPDs have to be cooled in order to suppress the dark current noise, hence, a series of tests were performed to choose the optimal operation temperature. Specifically, the temperature dependence of gain, energy resolution, dark current, excess noise factor, and detector response linearity was studied. Finally, details of the LAAPDs application in the muonic hydrogen experiment as well as their response to alpha particles are presented.
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