Passivation of Si(Li) detectors operated above cryogenic temperatures for space-based applications
Passivation of Si(Li) detectors operated above cryogenic temperatures for space-based applications
复制标题
用于天基应用的在低温以上运行的硅（锂）探测器的钝化
DOI：
10.1016/j.nima.2020.165015
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Smallshaw B.
中科院分区：
文献类型：
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作者：
Saffold N.;Rogers F.;Xiao M.;Bhatt R.;Erjavec T.;Fuke H.;Hailey C.J.;Kozai M.;Kraych D.;Martinez E.;Melo-Carrillo C.;Perez K.;Rodriguez C.;Shimizu Y.;Smallshaw B.
本研究评估了聚酰亚胺和聚苯二烯- c用于锂漂硅（Si (Li)）探测器钝化的可行性。钝化的Si （Li）探测器将构成通用反粒子光谱仪（gap）实验的粒子跟踪器和x射线探测器，该实验是一种气球载实验，用于探测暗物质湮灭或衰变中产生的宇宙反氘核。通过热固化聚酰亚胺获得了成功的钝化涂层，并且优化的涂层形成了优异的防潮和有机污染屏障。当工作温度为- 35至- 45℃时，钝化的Si （Li）探测器为20 - 100 keV的x射线提供了约4 keV的能量分辨率（FWHM）。这是首次报道成功钝化在低温以上工作的Si （Li）基x射线探测器。
This work evaluates the viability of polyimide and parylene-C for passivation of lithium-drifted silicon (Si (Li)) detectors. The passivated Si (Li) detectors will form the particle tracker and X-ray detector of the General Antiparticle Spectrometer (GAPS) experiment, a balloon-borne experiment optimized to detect cosmic antideuterons produced in dark matter annihilations or decays. Successful passivation coatings were achieved by thermally curing polyimides, and the optimized coatings form an excellent barrier against humidity and organic contamination. The passivated Si (Li) detectors deliver≲ 4 keV energy resolution (FWHM) for 20− 100 keV X-rays while operating at temperatures of− 35 to− 45° C. This is the first reported successful passivation of Si (Li)-based X-ray detectors operated above cryogenic temperatures.