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A balloon experiment using CALET prototype (bCALET-2)

机译:使用CALET原型(bCALET-2)进行的气球实验

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摘要

CALET (CALorimetric Electron Telescope) is a high energy cosmic-ray detector to be installed on International Space Station in 2015 to carry out accurate measurements of high energy electrons and gamma-rays. For verification of the detector performance, we carried out balloon experiments using CALET prototype detectors in May 2006 (bCALET-1) and in August 2009 (bCALET-2). In this paper we mainly report about the second experiment using bCALET-2. bCALET-2 is a calorimetric instrument composed of a 3.58 radiation length thick tungsten-scintillating fiber imaging calorimeter (IMC) and a 13.4 radiation length thick bismuth-germanium-oxide calorimeter (TASC). The concept of the structure is similar to that of CALET, but the number of sensors and the thickness of materials were optimized for the balloon experiment. The observation was carried out at the Taiki Aerospace Research Field of JAXA in Hokkaido, and the detector was flown successfully for 2.5 h at a level altitude of 35 km. The observed events were analyzed by methods developed through Monte Carlo simulations, and the energy spectra of electrons and atmospheric gamma-rays in the energy range of 1-30 GeV were obtained and compared to the results of previous experiments.
机译:CALET(CALorimetric Electron Telescope,CALorimetric电子望远镜)是一种高能宇宙射线探测器,将于2015年安装在国际空间站上,以对高能电子和伽马射线进行精确测量。为了验证探测器的性能,我们分别于2006年5月(bCALET-1)和2009年8月(bCALET-2)使用CALET原型探测器进行了气球实验。在本文中,我们主要报告有关使用bCALET-2进行的第二个实验。 bCALET-2是一种量热仪,由3.58辐射长度厚的钨闪烁纤维成像量热仪(IMC)和13.4辐射长度厚的铋-锗氧化物量热仪(TASC)组成。该结构的概念与CALET相似,但是针对气球实验优化了传感器的数量和材料的厚度。观测是在北海道JAXA的Taiki航天研究领域进行的,该探测器在35 km的高空成功飞行了2.5 h。通过蒙特卡罗模拟开发的方法分析了观测到的事件,获得了电子和大气伽马射线在1-30 GeV能量范围内的能谱,并将其与先前的实验结果进行了比较。

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