WFIRST coronagraph detector trap modeling results and improvements

WFIRST coronagraph detector trap modeling results and improvements
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WFIRST 日冕仪探测器陷阱建模结果和改进

DOI:
10.1117/12.2311408
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Holland A
Holland A
中科院分区:
--
文献类型:
--
作者:
Holland A

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WFIRST日冕仪的设计目的是通过从行星表面和大气层反射的星光来探测和表征成熟的系外行星。据估计,从这些遥远的系外行星入射到探测器上的光大约是每像素每小时几个光子。为了测量这样的小信号,该项目以e2v制造的ccd201探测器为基础,e2v是一种低噪声和高效率的电子倍增电荷耦合器件(Emccd),并建立了一套严格的测试和建模程序,以在飞行前对该器件进行表征。一个重要的考虑因素是探测器在拟议的飞行任务寿命内因空间辐射照射而性能下降。为了量化这一估计的性能损失,该项目建立了一个探测器陷阱模型,该模型考虑了亚像素级别的详细陷阱交互作用,包括随机陷阱捕获和释放,以及在伪两相CCD201器件的并行和串行时钟期间电荷延迟到后续像素。本文介绍了探测器陷阱模型的最新改进和模拟结果。
The WFIRST coronagraph is being designed to detect and characterize mature exoplanets through the starlight reflected from their surfaces and atmospheres. The light incident on the detector from these distant exoplanets is estimated to be on the order of a few photons per pixel per hour. To measure such small signals, the project has baselined the CCD201 detector made by e2v, a low-noise and high-efficiency electron-multiplying charge-coupled device (EMCCD), and has instituted a rigorous test and modeling program to characterize the device prior to flight. An important consideration is detector performance degradation over the proposed mission lifetime due to radiation exposure in space. To quantify this estimated loss in performance, the project has built a detector trap model that takes into account detailed trap interactions at the sub-pixel level, including stochastic trap capture and release, and the deferment of charge into subsequent pixels during parallel and serial clocking of the pseudo-two-phase CCD201 device. This paper describes recent detector trap model improvements and modeling results.
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