Effects of Stray Magnetic Field on Transition-edge Sensors in Gamma-ray Microcalorimeters

Published

May 19, 2024

Author(s)

Mark Keller, Abigail Wessels, Dan Becker, Douglas Bennett, Matthew Carpenter, Mark Croce, Jozsef Imrek, Johnathon Gard, John Mates, Kelsey Morgan, Nathan Ortiz, Dan Schmidt, Katherine Schreiber, Daniel Swetz, Joel Ullom

Abstract

Superconducting transition-edge sensors (TESs) used in x-ray and γ-ray microcalorimeters suffer degraded performance if cooled in a magnetic field B sufficient to trap flux in the sensors. We report measurements of γ-ray TESs before and after implementing measures to reduce stray B fields from sources inside and outside the cryostat. These measurements showed a correlation between anomalous features in TES current-voltage (IV ) curves and degraded energy resolution. After reducing internal sources of stray B field and improving shielding against external sources, both IV curves and energy resolution improved. Finally, we placed magnetized screws with remnant fields ∼ 10 μT near similar γ-ray TESs in a different type of detector package and observed the same effects.

Citation

Journal of Low Temperature Physics

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10909-024-03140-y

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Keywords

transition-edge sensor, gamma-ray spectrometer, magnetic shielding, flux trapping

Citation

Keller, M. , Wessels, A. , Becker, D. , Bennett, D. , Carpenter, M. , Croce, M. , Imrek, J. , Gard, J. , Mates, J. , Morgan, K. , Ortiz, N. , Schmidt, D. , Schreiber, K. , Swetz, D. and Ullom, J. (2024), Effects of Stray Magnetic Field on Transition-edge Sensors in Gamma-ray Microcalorimeters, Journal of Low Temperature Physics, [online], https://doi.org/10.1007/s10909-024-03140-y, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=956932 (Accessed July 27, 2024)