Thermalization efficiency of superconducting absorbers for thermal X-ray microcalorimeters

The persistence of long living quasiparticles created in the energy thermalization process can affect the performances of a thermal X-ray microcalorimeter with superconducting absorber. Numerical simulations indicate that in an absorber made of high-purity Sn, operated at temperatures lower than 100...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2004-08, Vol.408, p.820-821
Main Authors: Perinati, E., Barbera, M., Serio, S., Silver, E.
Format: Article
Language:English
Subjects:
Microcalorimeters
Phonons
Quasiparticles
Superconducting absorbers
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Summary:The persistence of long living quasiparticles created in the energy thermalization process can affect the performances of a thermal X-ray microcalorimeter with superconducting absorber. Numerical simulations indicate that in an absorber made of high-purity Sn, operated at temperatures lower than 100 mK, up to 60% of the deposited energy can remain trapped in the quasiparticle system for a time much longer than the time scale of the thermal sensor response, producing a reduction of the SNR of the detector. Other pure superconductors can present the same problem and therefore a microscopic analysis of the physical properties can be useful to identify suitable absorbing materials and optimize the detector performances.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2004.03.145