Identification and elimination of anomalous thermal decay in gamma-ray microcalorimeters

Published

November 18, 2013

Author(s)

Robert D. Horansky, Douglas A. Bennett, Daniel R. Schmidt, Barry L. Zink, Joel N. Ullom

Abstract

Microcalorimeter detectors rely on superconducting components and cryogenic temperatures to provide over an order-of-magnitude improvement in energy resolution compared to semiconducting sensors. Resolution improvements impact fields from gamma-ray astrophysics to nuclear safeguards. The temporal response of these detectors has been much slower than predicted from the known device parameters. This discrepancy has been attributed to the dynamics of quasiparticles and phonons in the bulk absorber used for absorbing photons. We will show that long-lived states in the glue used for absorber attachment have been the dominant cause of the slow response. Also, we have fabricated microcalorimeters using metal-to-metal diffusion bonding to attach the absorber. These detectors show a significant improvement in their recovery after gamma-ray events and will now enable study of the internal scattering dynamics of the bulk absorber.

Citation

Applied Physics Letters

Volume

103

Issue

21

Pub Type

Journals

Download Paper

https://doi.org/10.1063/1.4830373

Keywords

superconductors, TES, microcalorimeters

Citation

Horansky, R. , Bennett, D. , Schmidt, D. , Zink, B. and Ullom, J. (2013), Identification and elimination of anomalous thermal decay in gamma-ray microcalorimeters, Applied Physics Letters, [online], https://doi.org/10.1063/1.4830373 (Accessed October 15, 2025)