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Proceedings Paper

Spectroscopic performance of DEPFET active pixel sensor prototypes suitable for the high count rate Athena WFI detector
Author(s): Johannes Müller-Seidlitz; Robert Andritschke; Alexander Bähr; Norbert Meidinger; Sabine Ott; Rainer H. Richter; Wolfgang Treberspurg; Johannes Treis
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Paper Abstract

The focal plane of the WFI of Athena consists of two sensors. One features a large field of view of 40' X 40' and one is forseen to be used for bright point like sources. Both parts base on DEPFET active pixel sensors. To fulfil the count rate requirement for the smaller sensor of less than 1% pile-up for a one Crab source it has to have a sufficient high frame rate. Since therefore the readout becomes a large fraction of the total photon integration time, the probability of measurements with incomplete signals increases. A shutter would solve the problem of these so called misfits but is not in agreement with the required high throughput of more than 80%. The Infinipix design has implemented a storage in addition to separate the collection and the readout of the charges without discarding them. Its working principle was successfully shown by Bähr et al.1 on single pixel level. For the further development three layout variants were tested on a 32 X 32 pixel array scale. The measurements of the spectroscopic performance show very promising results even for the intended readout speed for the Athena WFI of 2:5 μs per sensor row. Although, there are still layout and technology improvements necessary to ensure the reliability needed for space missions. In this paper we present the measurement results on the comparison of the three prototype layout variants.

Paper Details

Date Published: 11 July 2016
PDF: 7 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 990567 (11 July 2016); doi: 10.1117/12.2235408
Show Author Affiliations
Johannes Müller-Seidlitz, Max-Planck-Institut für extraterrestrische Physik (Germany)
Robert Andritschke, Max-Planck-Institut für extraterrestrische Physik (Germany)
Alexander Bähr, Max-Planck-Institut für extraterrestrische Physik (Germany)
Norbert Meidinger, Max-Planck-Institut für extraterrestrische Physik (Germany)
Sabine Ott, Max-Planck-Institute for extraterrestrial Physics (Germany)
Rainer H. Richter, Semiconductor Lab. of the Max-Planck-Society (Germany)
Wolfgang Treberspurg, Max-Planck-Institut für extraterrestrische Physik (Germany)
Johannes Treis, Semiconductor Lab. of the Max-Planck-Society (Germany)

Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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