First Configurational Study of the CryoAC Detector Silicon Chip of the Athena X-Ray Observatory

The 50 mK cryogenic focal plane anticoincidence detector of the Athena X-ray observatory (CryoAC) is a silicon-suspended absorber sensed by a network of 400 Ir/Au transition edge sensors (TES) and connected through silicon bridges to a surrounding silicon frame plated with gold. The device is shaped...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2023-01, Vol.33 (1), p.1-7
Main Authors: Ferrari Barusso, Lorenzo, Boragno, Corrado, Celasco, Edvige, Fedkevych, Mariia, Gallucci, Giovanni, De Gerone, Matteo, Grosso, Daniele, Repetto, Luca, Niazi, Kifayat, Rigano, Manuela, Macculi, Claudio, D'Andrea, Matteo, Gatti, Flavio
Format: Article
Language:English
Subjects:
Absorbers
Arrays
Detectors
Focal plane
Interaction models
Observatories
Phonon
Phonons
Protons
Reactive ion etching
Scattering
Signal generation
Silicon
Silicon wafers
Time-frequency analysis
transition edge sensors (TES)
X-rays astrophysics
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Summary:The 50 mK cryogenic focal plane anticoincidence detector of the Athena X-ray observatory (CryoAC) is a silicon-suspended absorber sensed by a network of 400 Ir/Au transition edge sensors (TES) and connected through silicon bridges to a surrounding silicon frame plated with gold. The device is shaped by deep reactive ion etching from a single silicon wafer of 500 μ m. In operating test of prototypes of the demonstration model of the CryoAC, we have highlighted the importance of the phonon hot spot in the signal generation. A fast response to the cosmic particle of a large area of about 4 cm 2 and a thin 0.5 mm silicon absorber covered by a TES array can be assured by matching the array configuration to the size and properties of the hot spot. In this article, we present the preparatory study of a proposal for measuring the phonon hot spot that is predicted by the particle-absorber interaction model.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2022.3222959