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arXiv 1408.6546astro-ph.IMphysics.ins-det
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LOFT上LAD探测器滤波器的基线设计

Baseline design of the filters for the LAD detector on board LOFT

M. Barbera, B. Winter, J. Coker, M. Feroci, T. Kennedy, D. Walton, S. Zane

摘要:

X射线定时大型天文台(LOFT)是欧空局宇宙视野计划A阶段研究中选择的M3任务之一。LOFT的目的是对黑洞和中子星进行高时间分辨率的X射线观测。LOFT有效载荷上的主要仪器是大面积探测器(LAD),这是一个准直实验,标称有效面积为~10 m2@8 keV,在2-30 keV能带内的光谱分辨率为~240 eV。这些性能是通过覆盖2000多个大面积硅漂移探测器(SDD)的大收集区域实现的,每个SDD都耦合到基于铅玻璃微通道板的准直器。为了减少对向天空开放的探测器的热负荷,并保护它们免受带外辐射,将在SDD前面安装光热过滤器。已经考虑了LAD滤波器的不同选择,以在高量子效率和高机械鲁棒性之间实现最佳折衷。我们提出的基准设计的光热滤波器,显示的标称性能,并提出初步的测试结果在A阶段的研究。

英文摘要:

The Large Observatory for X-ray Timing (LOFT) was one of the M3 missions selected for the phase A study in the ESA's Cosmic Vision program. LOFT is designed to perform high-time-resolution X-ray observations of black holes and neutron stars. The main instrument on the LOFT payload is the Large Area Detector (LAD), a collimated experiment with a nominal effective area of ~10 m 2 @ 8 keV, and a spectral resolution of ~240 eV in the energy band 2-30 keV. These performances are achieved covering a large collecting area with more than 2000 large-area Silicon Drift Detectors (SDDs) each one coupled to a collimator based on lead-glass micro-channel plates. In order to reduce the thermal load onto the detectors, which are open to Sky, and to protect them from out of band radiation, optical-thermal filter will be mounted in front of the SDDs. Different options have been considered for the LAD filters for best compromise between high quantum efficiency and high mechanical robustness. We present the baseline design of the optical-thermal filters, show the nominal performances, and present preliminary test results performed during the phase A study.

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