16 - 21 June 2024
Yokohama, Japan
Conference 13093 > Paper 13093-33
Paper 13093-33

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

17 June 2024 • 15:55 - 16:10 Japan Standard Time | Room G414/415, North - 4F

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.

Presenter

INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
Matteo D'Andrea is a Researcher/Technologist at INAF/IAPS Roma. His activity is aimed at the development of new technologies for astrophysical observations from space. In particular, it is focused on the development of cryogenic detectors for X-ray Astrophysics, with particular regard to the background reduction techniques of these devices. At present, he is mainly working within the ESA ATHENA space mission, developing the Cryogenic AntiCoincidence detector (CryoAC) for the X-ray Integral Field Unit (X-IFU) spectrometer. It is a cryogenic detector based on TES (Transition Edge Sensor) technology.
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INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
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