The end-to-end simulator of the ATHENA X-IFU Cryogenic AntiCoincidence detector (CryoAC)

M. D'Andrea; C. Macculi; S. Lotti; L. Piro; A. Argan; G. Minervini; G. Torrioli; F. Chiarello; L. Ferrari Barusso; F. Gatti; M. Rigano

doi:10.1117/12.3017794

21 August 2024 The end-to-end simulator of the ATHENA X-IFU Cryogenic AntiCoincidence detector (CryoAC)

M. D'Andrea, C. Macculi, S. Lotti, L. Piro, A. Argan, G. Minervini, G. Torrioli, F. Chiarello, L. Ferrari Barusso, F. Gatti, M. Rigano

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 130930X (2024) https://doi.org/10.1117/12.3017794
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The X-IFU is one of the two instruments of ATHENA, the next ESA large X-ray observatory. It is a cryogenic spectrometer based on an array of TES microcalorimeters. To reduce the particle background, the TES array works in combination with a Cryogenic AntiCoincidence detector (CryoAC). The CryoAC is a 4-pixel detector, based on ~1 cm² silicon absorbers sensed by Ir/Au TES. It is required to have a wide energy bandwidth (from 20 keV to ~1 MeV), high efficiency (< 0.014% missed particles), low dead-time (< 1%) and good time-tagging accuracy (10 μs at 1σ). An end-to-end simulator of the CryoAC detector has been developed both for design and performance assessment, consisting of several modules. First, the in-flight flux of background particles is evaluated by Geant4 simulations. Then, the current flow in the TES is evaluated by solving the electro-thermal equations of microcalorimeters, and the detector output signal is generated by simulating the SQUID FLL dynamics. Finally, the output is analyzed by a high-efficiency trigger algorithm, producing the simulated CryoAC telemetry. Here, we present in detail this end-to-end simulator, and how we are using it to define the new CryoAC baseline configuration in the new Athena context.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

M. D'Andrea, C. Macculi, S. Lotti, L. Piro, A. Argan, G. Minervini, G. Torrioli, F. Chiarello, L. Ferrari Barusso, F. Gatti, and M. Rigano "The end-to-end simulator of the ATHENA X-IFU Cryogenic AntiCoincidence detector (CryoAC)", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 130930X (21 August 2024); https://doi.org/10.1117/12.3017794

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