Development of a balloon-style pressure vessel gondola for balloon-borne emulsion gamma-ray telescopes

Development of a balloon-style pressure vessel gondola for balloon-borne emulsion gamma-ray telescopes
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为气球载乳剂伽马射线望远镜开发气球式压力容器吊舱

DOI:
10.1088/1748-0221/14/09/p09009
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发表时间:
2019
期刊:
JINST
影响因子:
--
通讯作者:
T. Hara et al.
T. Hara et al.
中科院分区:
--
文献类型:
--
作者:
H. Rokujo;M. Komiyama;S. Aoki;K. Hamada;T. Hara et al.

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使用核乳胶的伽马射线望远镜可以观测0.01-100 GeV能量范围内的恒星物体,具有高角分辨率、偏振灵敏度和大孔径面积。核乳胶伽马射线天体成像仪(GRAINE)项目旨在通过使用球载乳胶望远镜对宇宙伽马射线进行高精度观测。我们为GRAINE 2018球载实验开发了一种气球式压力容器吊舱。它使我们能够保持强大的真空包装的乳胶室,即使在气球高度。容器的大部分是由超薄聚酯纤维涂层的聚酯织物组成的膜材料制成的。它重量轻,便携式,可用于扩大探测器的安装面积,不像大多数金属容器。此外,由于宇宙射线与容器之间的相互作用而产生的信号伽马射线的吸收和背景伽马射线的产生可以被最小化。配备0.38平方米乳胶望远镜和其他设备的压力容器吊舱于2018年4月26日发射。在整个观测期间(17小时21分钟),内压保持在230百帕以上。GRAINE项目将使用放大的望远镜开始科学观测,压力容器吊舱计划将探测器的安装面积扩大到100平方米,同时遵循GRAINE 2018模型的设计。
A gamma-ray telescope using nuclear emulsions allows observations of stellar objects in the 0.01–100 GeV energy region with high angular resolution, polarization sensitivity, and large aperture area. The Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE) project is designed to enable high-precision observation of cosmic gamma rays through the use of balloon-borne emulsion telescopes. We have developed a balloon-style pressure vessel gondola for the GRAINE 2018 balloon-borne experiment. It enables us to maintain robust and vacuum-packed emulsion chambers even at balloon altitudes. The greater part of the vessel is made of membrane materials consisting of ultra-thin polyurethane-coated polyester fabric. It is lightweight and portable, and can be used to expand the mounting area of the detector, unlike mostly metal vessels. Moreover, the absorption of signal gamma rays and background gamma-ray production due to interactions between cosmic rays and the vessel can be minimized. The pressure vessel gondola, equipped with a 0.38-m 2 emulsion telescope and other equipment, was launched on April 26, 2018. During the whole observation (17 h 21 m), the internal pressure was kept above 230 hPa. The GRAINE project will start scientific observation using enlarged telescopes and the pressure vessel gondola is planned to include an expansion of the mounting area of the detector to∼ 10 m 2 while following the design on the GRAINE 2018 model.
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