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Proceedings Paper

Requirements for the detectors and read-out of ATHENA X-IFU
Author(s): R. den Hartog; D. Barret; L. Gottardi; J.-W. den Herder; B. Jackson; P. de Korte; J. van der Kuur; B.-J. van Leeuwen; D. van Loon; A. Nieuwenhuizen; L. Ravera
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Paper Abstract

The detector system of the X-Ray Integral Field Unit (X-IFU), one of the two ATHENA focal plane instruments will be an ambitious step forward in the field of astronomical X-ray detection. We describe its baseline configuration, consisting of 3840 Transition Edge Sensors (TES) microcalorimeters with an energy resolution of 2.5 eV FWHM, spanning a 5 arcminute field-of-view and allowing an imaging resolution of 5 arcsec. The detectors are read out in 96 channels of 40 pixels each, using frequency domain multiplexing (FDM). Each channel contains a dual-stage SQUID pre-amplifier and a low-noise amplifier (LNA). In order to enhance the dynamic range of the SQUIDs a specific technique, baseband feedback (BBFB), is applied. The generation of the carrier and feedback signals, and the signal processing are done in the digital domain. We review the requirements for the main elements of this system, needed to ensure the high performance of the detector system. From the resolution requirements for the detectors follows a budget for contributions to the energy resolution on top of the intrinsic detector resolution. This budget forms the basis for the assessment of the dynamic range requirements for the SQUID and the LNA and the DACs and the ADC. Requirements are also derived for the levels of crosstalk and non-linearity in the readout chain.

Paper Details

Date Published: 25 July 2014
PDF: 13 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91445Q (25 July 2014); doi: 10.1117/12.2056434
Show Author Affiliations
R. den Hartog, SRON Netherlands Institute for Space Research (Netherlands)
D. Barret, Institut de Recherche en Astrophysique et Planétologie, CNRS (France)
L. Gottardi, SRON Netherlands Institute for Space Research (Netherlands)
J.-W. den Herder, SRON Netherlands Institute for Space Research (Netherlands)
B. Jackson, SRON Netherlands Institute for Space Research (Netherlands)
P. de Korte, SRON Netherlands Institute for Space Research (Netherlands)
J. van der Kuur, SRON Netherlands Institute for Space Research (Netherlands)
B.-J. van Leeuwen, SRON Netherlands Institute for Space Research (Netherlands)
D. van Loon, SRON Netherlands Institute for Space Research (Netherlands)
A. Nieuwenhuizen, SRON Netherlands Institute for Space Research (Netherlands)
L. Ravera, Institut de Recherche en Astrophysique et Planétologie, CNRS (France)


Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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