GRAINE project, the first balloon-borne, emulsion gamma-ray telescope experiment
GRAINE project, the first balloon-borne, emulsion gamma-ray telescope experiment
复制标题
GRAINE 项目，第一个气球载乳液伽马射线望远镜实验
DOI：
10.1093/ptep/ptv046
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hiroki Rokujo
中科院分区：
文献类型：
--
作者：
Satoru Takahashi;Shigeki Aoki;Keiki Kamada;Saki Mizutani;Ryo Nakagawa;Keita Ozaki;Hiroki Rokujo
GRAINE项目(带核乳胶的伽马射线天文成像仪)是为观测10 MeV-100 GeV能量范围内的宇宙射线而开发的，它使用一台精密的(0.08at 1-2 GeV)偏振敏感大口径(10 m)乳胶望远镜，通过重复长时间的气球飞行。2011年，为了进行可行性和性能测试，成功地进行了第一次气球载实验，该实验的口径面积为1米，飞行时间为4.6小时。对乳胶片的整个区域进行了系统的检测、能量重建和时间戳，最大入射天顶角为45，最小能量为50 MeV-射线，检测可靠性为97%，时间戳精度为0.2s，时间戳可靠性为98%。利用转换器中产生的射线建立了射线数据检查和校准方法。我们测量了50300MeV能量范围内的大气射线通量，并对宇宙线背景有了初步的了解。通过结合姿态数据，我们建立了在天坐标下确定射线到达方向的程序。气球载乳胶望远镜的首次飞行证实了它作为高性能宇宙线探测器的潜力。
The GRAINE project (Gamma-Ray Astro-Imager with Nuclear Emulsion) has been developed for the observation of cosmic-rays in the energy range 10 MeV–100 GeV with a precise (0.08at 1–2 GeV), polarization-sensitive, large-aperture-area (10 m) emulsion telescope by repeated long-duration balloon flights. In 2011, the first balloon-borne experiment was successfully performed with acmaperture area and 4.6 hour flight duration for a feasibility and performance test. Systematic detection, energy reconstruction, and timestamping of-ray events were performed across the whole area of the emulsion film, up to 45incident zenith angle, down to 50 MeV-ray energy, with 97% detection reliability, 0.2 sec timestamp accuracy, and 98% timestamp reliability. A-ray data checking and calibration method was created using the-rays produced in the converter. We measured the atmospheric-ray flux in the energy range 50–300 MeV and obtained a first understanding of the cosmic-ray background. By combining the attitude data, we established a procedure for determining the-ray arrival direction in celestial coordinates. The first flight of the balloon-borne emulsion telescope confirmed its potential as a high-performance cosmic-ray detector.