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arXiv 1003.0455astro-ph.IMastro-ph.HE
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SVOM任务中ECLAIR X- Gamma-ray相机的肖特基CdTe探测器的广泛测试

Extensive testing of Schottky CdTe detectors for the ECLAIRs X-Gamma-ray Camera on board the SVOM mission

Remoue Nadege, Barret Didier, Godet Olivier, Mandrou Pierre

摘要:

我们报告了由Acrorad公司提供的超过5000个肖特基CdTe探测器(4x 4x 1 mm^3)的正在进行的测试活动,样本超过12000个,Ltd(日本).其中6400个探测器将用于中法伽马射线暴飞行任务SVOM中ECLAIR相机的探测平面。这些测试是强制性的,以满足ECLAIR的主要要求,以检测低至4 keV的伽马射线暴光子。探测器将在-20 ℃下工作,反向偏压为600 V。我们发现,78%的探测器已经测试过,可以考虑用于飞行模型。我们在59.6 keV处测量了1.8 keV的平均能量分辨率。为了更快地分析,我们首先在室温和低偏压下研究了极化效应。我们发现,量子效率,增益和能量分辨率的光谱退化,一旦打开偏置就开始:首先缓慢,然后在时间t_p之后急剧下降,时间t_p取决于温度和电压值。在飞行条件下(-20 ℃,-600 V)的初步测试表明,探测器应该在大于一天的时间尺度上保持稳定。我们还测量了170个肖特基CdTe探测器的平均激活能。我们发现了两种不同的探测器群体的证据:主要的一个中心在0.64 eV,解释为由于晶体中的镉空位,第二个人口中心在0.54 eV,与较低的表观电阻率(删节)。

英文摘要:

We report on an on-going test campaign of more than 5000 Schottky CdTe detectors (4x4x1 mm^3), over a sample of twelve thousands, provided by Acrorad Co., Ltd (Japan). 6400 of these detectors will be used to build the detection plane of the ECLAIRs camera on the Chinese-French gamma-ray burst mission SVOM. These tests are mandatory to fulfill the prime requirement of ECLAIRs to detect gamma-ray burst photons down to 4 keV. The detectors will be operated at -20C under a reverse bias of 600 V. We found that 78% of the detectors already tested could be considered for the flight model. We measured a mean energy resolution of 1.8 keV at 59.6 keV. We investigated the polarization effect first at room temperature and low bias voltage for faster analysis. We found that the spectroscopic degradation in quantum efficiency, gain and energy resolution, starts as soon as the bias is turned on: first slowly and then dramatically after a time t_p which depends on the temperature and the voltage value. Preliminary tests under in-flight conditions (-20C, -600 V) showed that the detectors should remain stable over a timescale larger than a day. We also measured the mean activation energy of 170 Schottky CdTe detectors. We found evidence for two distinct populations of detectors: the main one centered at 0.64 eV, interpreted as due to cadmium vacancies in the crystal, and the second population centered at 0.54 eV, correlated with a lower apparent resistivity (abridged).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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