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Energy response of ATHENA WFI prototype detectors
Author(s): Wolfgang Treberspurg; Johannes Müller-Seidlitz; Norbert Meidinger; Annika Behrens; Robert Andritschke; Michael Bonholzer; Valentin Emberger; Günter Hauser
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Paper Abstract

The Wide Field Imager instrument of ESA’s next X-ray observatory Athena will consist of specifically developed DEPFET detectors which enable a low noise and fast readout operation. In order to confirm the required spectroscopic performance within the energy range of 0.2 keV to 15 keV, various emission lines were probed with prototype detectors on a 64×64 pixel scale. These detectors include the first sensors representative for flight with respect to the transistor layout and fabrication technology. Four different detectors were tested and exhibit a Fano noise limited spectral performance. The required energy resolution was achieved by all detectors even at readout times as fast as 2.5 μs/row. Additionally, one of the detectors achieved an outstanding performance of a FWHM below 45 eV at C Kα (277 eV) and 6.1 μs/row. Complementary to the measurements, the charge cloud size was determined as a function of the photon energy based on Monte Carlo simulations. These simulations enable a quantification of the effective charge loss at different energies due to the thresholds applied at the event recombination.

Paper Details

Date Published: 6 July 2018
PDF: 9 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106994F (6 July 2018); doi: 10.1117/12.2313195
Show Author Affiliations
Wolfgang Treberspurg, Max-Planck-Institut für extraterrestrische Physik (Germany)
Johannes Müller-Seidlitz, Max-Planck-Institut für extraterrestrische Physik (Germany)
Norbert Meidinger, Max-Planck-Institut für extraterrestrische Physik (Germany)
Annika Behrens, Max-Planck-Institut für extraterrestrische Physik (Germany)
Robert Andritschke, Max-Planck-Institut für extraterrestrische Physik (Germany)
Michael Bonholzer, Max-Planck-Institut für extraterrestrische Physik (Germany)
Valentin Emberger, Max-Planck-Institut für extraterrestrische Physik (Germany)
Günter Hauser, Max-Planck-Institut für extraterrestrische Physik (Germany)


Published in SPIE Proceedings Vol. 10699:
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa, Editor(s)

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