ATTENZIONE! IL REPOSITORY E’ APERTO ESCLUSIVAMENTE ALL’IMMISSIONE DEI RAPPORTI TECNICI (COLLEZIONE 4.01). NON E’ POSSIBILE INSERIRE PRODOTTI IN TUTTE LE ALTRE COLLEZIONI, A CAUSA DI PROBLEMI TECNICI. THE REPOSITORY IS OPEN EXCLUSIVELY FOR THE SUBMISSION OF TECHNICAL REPORTS (COLLECTION 4.01). SUBMISSIONS TO ALL OTHER COLLECTIONS ARE TEMPORARILY UNAVAILABLE, DUE TO TECHNICAL ISSUES.
 

The Cryogenic AntiCoincidence Detector for ATHENA X-IFU: Assessing the Role of the Athermal Phonons Collectors in the AC-S8 Prototype

Journal
Date Issued
2018
Author(s)
•
•
•
•
•
•
Biasotti, M.
•
Corsini, D.
•
Gatti, F.
•
Torrioli, G.
DOI
Abstract
The ATHENA X-ray observatory is the second large-class mission in the ESA Cosmic Vision 2015-2025 science programme. One of the two on-board instruments is the X-IFU, an imaging spectrometer based on a large array of TES microcalorimeters. To reduce the particle-induced background, the spectrometer works in combination with a cryogenic anticoincidence detector (CryoAC), placed less than 1 mm below the TES array. The last CryoAC single-pixel prototypes, namely AC-S7 and AC-S8, are based on large-area (1 cm^2) silicon absorbers sensed by 65 parallel-connected iridium TES. This design has been adopted to improve the response generated by the athermal phonons, which will be used as fast anticoincidence flag. The latter sample is featured also with a network of aluminum fingers directly connected to the TES, designed to further improve the athermals collection efficiency. In this paper, we will report the main results obtained with AC-S8, showing that the additional fingers network is able to increase the energy collected from the athermal part of the pulses (from the 6% of AC-S7 up to the 26 % with AC-S8). Furthermore, the finger design is able to prevent the quasiparticle recombination in the aluminum, assuring a fast pulse rising front ( L/ R limited). In our road map, the AC-S8 prototype is the last step before the development of the CryoAC demonstration model, which will be the detector able to demonstrate the critical technologies expected in the CryoAC development programme.
Volume
193
Issue
5-6
Start page
949
Uri
Url
Issn Identifier
0022-2291
Ads BibCode
2018JLTP..193..949D
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

1807.08561.pdf

Description
postprint
Size

2.31 MB

Format

Adobe PDF

Checksum (MD5)

6f7a21502f73a371ab7a03c6cd33c870

Loading...
Thumbnail Image
Name

2018 - J Low Temp Phys - DAndrea et al. AC-S8.pdf

Description
[Administrators only]
Size

2.8 MB

Format

Adobe PDF

Checksum (MD5)

a456c4f628c484abba3cf0057c48c9d6