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Proceedings Paper

Modeling the energy thermalization of x-ray photons in a microcalorimeter with superconducting absorber
Author(s): Emanuele Perinati; Marco Barbera; Alfonso Collura; Salvatore Serio; Eric H. Silver; Jeffrey W. Beeman; Eugene E. Haller; Don A. Landis; Norman W. Madden
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Paper Abstract

We present a modeling of the response of a microcalorimeter to the absorption of X-ray photons, based on the main microscopical processes responsible for the energy thermalization. In particular, we have modeled a microcalorimeter with superconducting tin absorber (350 micron x 350 micron x 7 micron) and neutron transmutation doped (NTD) germanium thermistor (75 micron x 50 micron x 150 micron). Such a detector, operated at 60 mK, is expected to achieve a spectral resolution as good as 1 eV FWHM in the soft X-ray energy range, based on the known sources of thermal and electronic noise. Nevertheless, the best spectral resolution measured in laboratory experimental tests is of about 5 eV FWHM (at 5.89 keV). We have investigated how the microscopic processes of energy thermalization, involving both quasiparticles and phonons, and the position of absorption of the photons may affect the spectral resolution of the detector.

Paper Details

Date Published: 11 March 2003
PDF: 11 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461559
Show Author Affiliations
Emanuele Perinati, Osservatorio Astronomico di Palermo (Italy)
Marco Barbera, Osservatorio Astronomico di Palermo (Italy)
Alfonso Collura, Osservatorio Astrofisico di Palermo (Italy)
Salvatore Serio, Osservatorio Astronomico di Palermo (Italy)
Univ. degli Studi di Palermo (Italy)
Eric H. Silver, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jeffrey W. Beeman, Lawrence Berkeley National Lab. (United States)
Eugene E. Haller, Lawrence Berkeley National Lab. (United States)
Don A. Landis, Lawrence Berkeley National Lab. (United States)
Norman W. Madden, Lawrence Berkeley National Lab. (United States)

Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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