The protoMIRAX Hard X-ray Imaging Balloon Experiment
The protoMIRAX Hard X-ray Imaging Balloon Experiment
复制标题
protoMIRAX 硬 X 射线成像气球实验
DOI：
10.1051/0004-6361/201526343
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Fialho
中科院分区：
文献类型：
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作者：
J. Braga;F. D’Amico;M. Avila;A. Penacchioni;J. Sacahui;Valdivino Santiago;Fátima Mattiello;C. Strauss;M. Fialho
原型MIRAX硬X射线成像望远镜是一个气球载实验装置，作为MIRAX卫星使命的探路者而开发。该实验主要包括编码孔径硬X射线（30-200 keV）成像仪，该成像仪具有总面积为169 cm^2 $的2 mm厚平面CZT探测器的正方形阵列（13 × 13）。总的，完全编码的视场是21 ^{\circ}\times 21^{\circ}$，角分辨率是1$^{\circ}$43 '。在本文中，我们描述了原型MIRAX仪器及其气球吊舱的所有子系统，并显示了仪器性能的模拟结果。原型MIRAX的主要目标是对选定的亮源进行成像光谱学，以展示MIRAX硬X射线成像仪原型的性能。详细的背景和成像模拟进行了protoMIRAX气球飞行。在大气深度为2.7 g cm$^{-2}$、平均天顶角为30 $^{\circ}$、积分时间为8 hs的情况下，30-200 keV范围内的3 $\sigma $灵敏度为~1.9 $\times $10 $^{-5}$光子cm$^{-2}$ s$^{-1}$。我们已经开发了一个用于气球吊舱的姿态控制系统和新的数据处理和地面系统，其中还包括MIRAX卫星的原型。我们提出了在气球高度的相机响应的Monte Carlo模拟的结果，显示预期的背景水平和详细的灵敏度protoMIRAX。我们还提出了螃蟹地区的成像模拟的结果。结果表明，protoMIRAX能够对明亮的硬X射线源场进行光谱和成像观测。此外，气球观测将在近空间环境中对MIRAX硬件和软件进行非常重要的测试和演示。
The protoMIRAX hard X-ray imaging telescope is a balloon-borne experiment developed as a pathfinder for the MIRAX satellite mission. The experiment consists essentially in a coded-aperture hard X-ray (30-200 keV) imager with a square array (13$\times$13) of 2mm-thick planar CZT detectors with a total area of 169 cm$^2$. The total, fully-coded field-of-view is $21^{\circ}\times 21^{\circ}$ and the angular resolution is 1$^{\circ}$43'. In this paper we describe the protoMIRAX instrument and all the subsystems of its balloon gondola, and we show simulated results of the instrument performance. The main objective of protoMIRAX is to carry out imaging spectroscopy of selected bright sources to demonstrate the performance of a prototype of the MIRAX hard X-ray imager. Detailed background and imaging simulations have been performed for protoMIRAX balloon flights. The 3$\sigma$ sensitivity for the 30-200 keV range is ~1.9 $\times$ 10$^{-5}$ photons cm$^{-2}$ s$^{-1}$ for an integration time of 8 hs at an atmospheric depth of 2.7 g cm$^{-2}$ and an average zenith angle of 30$^{\circ}$. We have developed an attitude control system for the balloon gondola and new data handling and ground systems that also include prototypes for the MIRAX satellite. We present the results of Monte Carlo simulations of the camera response at balloon altitudes, showing the expected background level and the detailed sensitivity of protoMIRAX. We also present the results of imaging simulations of the Crab region. The results show that protoMIRAX is capable of making spectral and imaging observations of bright hard X-ray source fields. Furthermore, the balloon observations will carry out very important tests and demonstrations of MIRAX hardware and software in a near space environment.