Performance study of a large CsI(Tl) scintillator with an MPPC readout for nanosatellites used to localize gamma-ray bursts-猫眼课题宝

DOI：

10.1016/j.nima.2018.08.039

发表时间：

2019-04

期刊：

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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通讯作者：

中科院分区：

其他

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作者：

Kento Torigoe;Y. Fukazawa;G. Galgóczi;T. Mizuno;K. Nakazawa;M. Ohno;A. Pál;H. Takahashi;Koji Tanaka;Norbert Tarcai;N. Uchida;N. Werner;T. Enoto;Z. Frei;Y. Ichinohe;L. Kiss;H. Odaka;J. Řípa;Z. Várhegyi

我们正在设计一组纳米卫星，通过测量到达时间差来精确确定短时间伽马射线爆发的位置。为了实现足够的光子统计精确测量的到达时间的严重限制下的大小，质量和功耗，我们建议使用大面积的CsI（Tl）闪烁器，提供了一个高的光输出和使用一个小尺寸的多像素光子计数器（MPPC），一种SiPM，具有低功耗。我们计划使用滨松光电提供的最新型号的MPPC之一，即S13360- 6050 CS，其有效面积为6× 6 mm 2。我们比较了两种不同尺寸（150× 75× 5 mm 3和100× 75× 5 mm 3）的闪烁体的性能;根据CubeSat标准，较大的闪烁体是可以安装在三单元卫星上的最大尺寸。我们发现，较大闪烁体的光产额低于较小闪烁体，但相差仅约13%，并且在25 ℃时，两者的能量阈值均为10 keV。我们已经测试了一个和两个MPPC读出，并确认了相同的能量阈值。双MPPC读出的光输出是单MPPC读出的1.4倍。我们还研究了使用241 Am（59.5 keV）源的辐射的光产额的位置依赖性，并证实，均匀性得到改善，和能量分辨率得到更好的1.7%的两个MPPC读出。

We are designing a fleet of nanosatellites to perform accurate position determinations of short-duration gamma-ray bursts by measuring arrival time differences. To achieve sufficient photon statistics to measure the arrival times precisely under the severe limitations of size, mass and power consumption, we propose the use of large-area CsI (Tl) scintillators which provide a high light output and the use of a small-sized multipixel photon counters (MPPC), a kind of SiPM, that have low power consumption. We plan to use one of the latest-model MPPCs provided by Hamamatsu Photonics, namely, S13360-6050CS, which has an active area of 6× 6 mm 2. We have compared the performance of two scintillators of different sizes (150× 75× 5 mm 3 and 100× 75× 5 mm 3); the bigger one is the maximum size that can be mounted on a three-unit satellite, according to CubeSat standards. We have found that the light yield of the bigger scintillator is lower than that of the smaller one, but the difference is only approximately 13%, and each has an energy threshold of∼ 10 keV at 25∘ C. We have tested one-and two-MPPC readout and confirmed the same energy thresholds. The light yield for the two-MPPC readout is 1.4 times as high as that for the one-MPPC readout. We have also examined the position dependence of the light yield by using radiation from a 241 Am (59.5 keV) source, and confirmed that uniformity was improved, and energy resolution got better by∼ 7% for two-MPPC readout.

Performance study of a large CsI(Tl) scintillator with an MPPC readout for nanosatellites used to localize gamma-ray bursts

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