标题： MIRAX任务的高分辨率X射线成像探测器平面 显示英文标题

标题： The High Resolution X-Ray Imaging Detector Planes for the MIRAX Mission

摘要： MIRAX X射线天文台是首个由巴西领导的天体物理空间任务，旨在执行前所未有的宽视场、宽波段硬X射线（5-200 keV）银河系X射线瞬变源调查。在当前配置中，MIRAX将携带四组编码掩膜望远镜，配备高空间分辨率的碲锌镉（CZT）探测器平面，每个平面由64个紧密排列的CZT像素化探测器组成。这四个望远镜总共具有959 cm^2的探测面积，大的视场（60x60度FWHM），此能量范围内的高角分辨率（6角分）以及非常好的能谱分辨率（约2 keV @ 60 keV）。MIRAX望远镜的一个平流层气球载荷原型已由哈佛-史密松天体物理中心（CfA）作为ProtoEXIST项目的一部分开发、测试并飞行。在本文中，我们展示了ProtoEXIST第二代实验（P2）单个CZT探测器的验证和校准测试结果。P2探测器平面的每个64个探测器单元均包含一个由加州理工学院为NuSTAR望远镜开发的ASIC芯片，该芯片与0.6毫米像素大小的CZT晶体混合。每个探测器的性能通过实验室中的放射性源进行了评估。校准结果表明，P2探测器在60 keV处的平均能量分辨率为约2.1 keV，在122 keV处的平均能量分辨率为约2.3 keV。P2还在一次气球飞行中成功进行了近太空环境测试，证明了探测器单元适用于空间任务望远镜的集成，并满足所有MIRAX任务要求。 显示英文摘要

摘要： The MIRAX X-ray observatory, the first Brazilian-led astrophysics space mission, is designed to perform an unprecedented wide-field, wide-band hard X-ray (5-200 keV) survey of Galactic X-ray transient sources. In the current configuration, MIRAX will carry a set of four coded-mask telescopes with high spatial resolution Cadmium Zinc Telluride (CZT) detector planes, each one consisting of an array of 64 closely tiled CZT pixelated detectors. Taken together, the four telescopes will have a total detection area of 959 cm^2, a large field of view (60x60 degrees FWHM), high angular resolution for this energy range (6 arcmin) and very good spectral resolution (~2 keV @ 60 keV). A stratospheric balloon-borne prototype of one of the MIRAX telescopes has been developed, tested and flown by the Harvard-Smithsonian Center for Astrophysics (CfA) as part of the ProtoEXIST program. In this paper we show results of validation and calibration tests with individual CZT detectors of the ProtoEXIST second generation experiment (P2). Each one of 64 detector units of the P2 detector plane consists of an ASIC, developed by Caltech for the NuSTAR telescope, hybridized to a CZT crystal with 0.6 mm pixel size. The performance of each detector was evaluated using radioactive sources in the laboratory. The calibration results show that the P2 detectors have average energy resolution of ~2.1 keV @ 60 keV and ~2.3 keV @ 122 keV. P2 was also successfully tested on near-space environment on a balloon flight, demonstrating the detector unit readiness for integration on a space mission telescope, as well as satisfying all MIRAX mission requirements.