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WP6: CryoAC trade-off

Date Issued
2016
Author(s)
•
Gatti, F.
•
•
Biasotti, M.
•
Corsini, D.
•
Abstract
In this document we will report the feasibility study for the CryoAC detection capability in the hard X-ray energy bandwidth. The main effort has been in understanding how the present “baseline” CryoAC detector can be improved or modified in order to enlarge scientific capability of the X-IFU instrument on energy bandwidth wider than the TES-array detector. The solution here proposed are beyond the CryoAC baseline detector design, being this instrument not a spectroscopic one since it mainly works as anticoincidence particle detector. This study starts with a brief overview of the CryoAC detector in order to know what is the baseline configuration which is the reference to start the feasibility study (Section 2). Then, we will report a scientific assessment of the CryoAC starting with the evaluation of the minimum detectable flux followed by an evaluation of the scientific performance by simulations taking into account astronomical sources (Section 3). The outcome of this scientific assessment will be the detector requirements enabling the CryoAC high energy scientific capability, whose parameters will be then probed in the related technological study (Section 4). The impact of the technological solution at the ATHENA X-IFU system level is reported in Section 5. Finally conclusions for the 2nd phase in the project are drawn. In this report we present the trade-off analysis performed for the cryogenic Anti-Coincidence detector (CryoAC). Whereas the detailed optimization of the detector is done as part of the X-IFU instrument design, within the context of AHEAD two major improvements are under study: - increase of the solid angle sensed by the CryoAC - improvement of the high energy response of the CryoAC to provide additional science return for highenergy photons (> 12 keV) As the second item may directly influence the physical properties of the CryoAC the current trade-off has been focussed on this part to be able to consider changes needed for the high energy response in the further work in this work package.
Volume
AHEAD-WP6-REP-004-2016
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AHEAD-trade-off_cryoAC_issue_1.pdf

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