Abstract
AbstractSuperconducting transition-edge sensors (TESs) used in X-ray and $$\gamma$$ γ -ray microcalorimeters suffer degraded performance if cooled in a magnetic field B sufficient to trap flux in the sensors. We report measurements of $$\gamma$$ 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 $$\sim$$ ∼ 10 $$\upmu \textrm{T}$$ μ T near similar $$\gamma$$ γ -ray TESs in a different type of detector package and observed the same effects.
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