JLow Temp Phys https://doi.org/10.1007/s10909-018-1964-6 The Performance of the Athena X-ray Integral Field Unit at Very High Count Rates 1 2 2 Philippe Peille · T. Dauser · C. Kirsch · 3 4 2 R. den Hartog · E. Cucchetti · J. Wilms · 4 3 5 D. Barret · J.-W. den Herder · L. Piro Received: 4 November 2017 / Accepted: 10 May 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018 Abstract The Athena X-ray Integral Field Unit (X-IFU) will operate at 90 mK a hexagonal matrix of 3840 Transition Edge Sensor pixels providing spatially resolved high-resolution spectroscopy (2.5 eV FWHM up to 7 keV) between 0.2 and 12 keV. During the observation of very bright X-ray sources, the X-IFU detectors will receive high photon rates going up to several tens of counts per second per pixel and hundreds per readout channel, well above the normal operating mode of the instrument. In this paper, we investigate through detailed end-to-end simulations the performance achieved by the X-IFU at the highest count rates. Special care is notably taken to model and characterize pulse processing limitations, readout-chain saturation effects, as well as the non-Gaussian degradation of the energy redistribution
Journal of Low Temperature Physics – Springer Journals
Published: May 30, 2018
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