Spectral broadening by quasiparticle pile-up in X-ray microcalorimeters with superconducting absorbers

Long-living quasiparticles can pile-up in a superconducting absorber of an X-ray microcalorimeter when photons are detected at high count rate. These quasiparticles can give a non-negligible contribution to the total heat capacity of the detector thus affecting the pulse height spectrum of detected...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2004-03, Vol.520 (1-3), p.220-223
Main Authors: Barbera, M, Perinati, E, Serio, S, Silver, E
Format: Article
Language:English
Subjects:
Microcalorimeters
Superconducting absorbers
X-ray spectroscopy
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Summary:Long-living quasiparticles can pile-up in a superconducting absorber of an X-ray microcalorimeter when photons are detected at high count rate. These quasiparticles can give a non-negligible contribution to the total heat capacity of the detector thus affecting the pulse height spectrum of detected photons. We investigated this effect with numerical simulations and evaluated the resulting spectral broadening as a function of the photon absorption rate, and the heat capacity of the detector for a NTD germanium microcalorimeter with pure Sn absorber.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2003.11.233