arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.01079astro-ph.IM
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雅典娜大视场成像仪

The Wide Field Imager Instrument for Athena

Norbert Meidinger, Josef Eder, Tanja Eraerds, Kirpal Nandra, Daniel Pietschner, Markus Plattner, Arne Rau, Rafael Strecker

摘要:

WFI(宽视场成像仪)仪器计划成为欧空局下一个X射线天文台雅典娜的两个互补焦平面相机之一。它通过40 amin x 40 amin的大视野结合了前所未有的测量能力以及出色的计数能力(大于1 Crab)。硅传感器的能量分辨率在从0.2 keV到15 keV的感兴趣能带中是最先进的,例如,在7 keV处的线的半峰全宽将优于170 eV,直到标称任务阶段结束。该性能通过使用具有130 × 130微米像素尺寸的DEPFET有源像素传感器来实现,其非常适合于镜系统的5弧秒半能量宽度(HEW)的轴上角分辨率。每个DEPFET像素是一个组合的传感器放大器结构,MOSFET集成到一个完全耗尽的450微米厚的硅块。WFI仪器计划使用两个检测器:一个大面积检测器,包括四个传感器,总像素为1024 x 1024,一个快速检测器,针对高计数率观察进行了优化。这种具有高计数率能力的检测器允许亮点源的强度为1克拉的吞吐量超过80%,堆积小于1%。DEPFET像素矩阵的快速读出由ASIC开发(称为VERITAS-2)促进。这些元件与Switcher-A(一种允许DEPFET在卷帘快门模式下运行的控制ASIC)一起构成WFI检测器的关键组件。探测器周围有一个Z级屏蔽罩,特别是为了避免荧光线,这将有助于仪器的背景。[摘要]

英文摘要:

The WFI (Wide Field Imager) instrument is planned to be one of two complementary focal plane cameras on ESA's next X-ray observatory Athena. It combines unprecedented survey power through its large field of view of 40 amin x 40 amin together with excellent count rate capability (larger than 1 Crab). The energy resolution of the silicon sensor is state-of-the-art in the energy band of interest from 0.2 keV to 15 keV, e.g. the full width at half maximum of a line at 7 keV will be better than 170 eV until the end of the nominal mission phase. This performance is accomplished by using DEPFET active pixel sensors with a pixel size of 130 x 130 microns is well suited to the on-axis angular resolution of 5 arcsec half energy width (HEW) of the mirror system. Each DEPFET pixel is a combined sensor-amplifier structure with a MOSFET integrated onto a fully depleted 450 micron thick silicon bulk. Two detectors are planned for the WFI instrument: A large-area detector comprising four sensors with a total of 1024 x 1024 pixels and a fast detector optimized for high count rate observations. This high count rate capable detector permits for bright point sources with an intensity of 1 Crab a throughput of more than 80% and a pile-up of less than 1 %. The fast readout of the DEPFET pixel matrices is facilitated by an ASIC development, called VERITAS-2. Together with the Switcher-A, a control ASIC that allows for operation of the DEPFET in rolling shutter mode, these elements form the key components of the WFI detectors. The detectors are surrounded by a graded-Z shield, which has in particular the purpose to avoid fluorescence lines that would contribute to the instrument background...[Abridged]

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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