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arXiv 2007.13537physics.ins-det
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新型低温低暗噪声硅光电倍增器的特性研究

Characterization of New Silicon Photomultipliers with Low Dark Noise at Low Temperature

K. Ozaki, S. Kazama, M. Yamashita, Y. Itow, S. Moriyama

摘要:

硅光电倍增器(SiPMs)具有低放射性、紧凑的几何结构、低工作电压和对真空紫外光(VUV)的合理的光电探测效率。因此,它有可能取代光电倍增管(PMT)的未来暗物质实验与液体氙(LXe)。然而,SiPM具有比PMT在低温($\sim$ 165 K)下的暗计数率(DCR)高近两个数量级的暗计数率。这种高DCR主要来源于带间隧穿效应产生的载流子。为了抑制隧穿效应,我们与滨松光子学公司合作开发了一种新的降低了电场强度的SiPM。K.并在153 ~ 298 K的温度范围内表征了其性能。我们证明了新开发的SiPM在低温下的DCR比传统的SiPM低6- 54倍。

英文摘要:

Silicon photomultipliers (SiPMs) have a low radioactivity, compact geometry, low operation voltage, and reasonable photo-detection efficiency for vacuum ultraviolet light (VUV). Therefore it has the potential to replace photomultiplier tubes (PMTs) for future dark matter experiments with liquid xenon (LXe). However, SiPMs have nearly two orders of magnitude higher dark count rate (DCR) compared to that of PMTs at the LXe temperature ($\sim$ 165 K). This type of high DCR mainly originates from the carriers that are generated by band-to-band tunneling effect. To suppress the tunneling effect, we have developed a new SiPM with lowered electric field strength in cooperation with Hamamatsu Photonics K. K. and characterized its performance in a temperature range of 153 K to 298 K. We demonstrated that the newly developed SiPMs had 6--54 times lower DCR at low temperatures compared to that of the conventional SiPMs.

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