Superconducting transition-edge sensors (TESs) used in X-ray and γ 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 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 T μ T near similar γ γ -ray TESs in a different type of detector package and observed the same effects.
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Keller et al. (2024) studied this question.
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