New readout and data-acquisition system in an electron-tracking Compton camera for MeV gamma-ray astronomy (SMILE-II)
New readout and data-acquisition system in an electron-tracking Compton camera for MeV gamma-ray astronomy (SMILE-II)
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用于 MeV 伽马射线天文学的电子跟踪康普顿相机中的新型读出和数据采集系统 (SMILE-II)
DOI：
10.1016/j.nima.2015.08.004
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S.Kurosawa
中科院分区：
文献类型：
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作者：
T.Mizumoto;Y.Matsuoka ;Y.Mizumura;T.Tanimori;H.Kubo;A.Takada;S.Iwaki;T.Sawano;K.Nakamura;S.Komura;S. Nakamura;T.Kishimoto;M.Oda;S.Miyamoto;T.Takemura;J.D.Parker;D.Tomono;S.Sonoda;K.Miuchi;S.Kurosawa
对于MeV伽玛射线天文学，我们开发了一种电子跟踪康普顿相机（ETCC）作为MeV伽玛射线望远镜，能够抑制辐射背景，并在太空中达到接近1 mCrab的高灵敏度。我们的ETCC包括一个气体时间投影室（TPC），带有用于跟踪反冲电子的微型气体探测器和用于检测散射伽马射线的位置敏感闪烁相机。2006年，小型ETCC（使用10×10×15 cm3TPC）首次气球实验成功，用于测量弥漫的宇宙和大气亚兆电子伏伽马射线（亚兆电子伏伽马射线成像气球实验I； SMILE-I），随后开发了一个（30厘米）3中型ETCC，用于测量来自天体源的MeV伽马射线光谱，如蟹状星云，进行为期一天的气球飞行（SMILE-II）。为了实现这一目标，需要在不改变探测器系统重量和功耗的情况下，将探测面积扩大到SMILE-I的100倍。此外，在观测期间，预计事件发生率也将急剧增加。在这里，我们描述了这种（30厘米）3ETCC的新数据采集系统的概念和性能，以管理100倍以上的数据，同时满足气球载观测对重量和功耗的严格限制。为了将TPC中精细轨迹的检测效率从~10%提高到~100%，我们在TPC中引入了一种新的数据处理算法。因此，为了有效地管理如此大量的数据，我们开发了一个并行数据流的数据采集系统。
For MeV gamma-ray astronomy, we have developed an electron-tracking Compton camera (ETCC) as a MeV gamma-ray telescope capable of rejecting the radiation background and attaining the high sensitivity of near 1 mCrab in space. Our ETCC comprises a gaseous time-projection chamber (TPC) with a micro pattern gas detector for tracking recoil electrons and a position-sensitive scintillation camera for detecting scattered gamma rays. After the success of a first balloon experiment in 2006 with a small ETCC (using a 10×10×15 cm3TPC) for measuring diffuse cosmic and atmospheric sub-MeV gamma rays (Sub-MeV gamma-ray Imaging Loaded-on-balloon Experiment I; SMILE-I), a (30 cm)3medium-sized ETCC was developed to measure MeV gamma-ray spectra from celestial sources, such as the Crab Nebula, with single-day balloon flights (SMILE-II). To achieve this goal, a 100-times-larger detection area compared with that of SMILE-I is required without changing the weight or power consumption of the detector system. In addition, the event rate is also expected to dramatically increase during observation. Here, we describe both the concept and the performance of the new data-acquisition system with this (30 cm)3ETCC to manage 100 times more data while satisfying the severe restrictions regarding the weight and power consumption imposed by a balloon-borne observation. In particular, to improve the detection efficiency of the fine tracks in the TPC from ~10% to ~100%, we introduce a new data-handling algorithm in the TPC. Therefore, for efficient management of such large amounts of data, we developed a data-acquisition system with parallel data flow.