Mark W. Keller, A. L. Wessels, D. T. Becker, D. A. Bennett, M. H. Carpenter, M. P. Croce, J. D. Gard, J. Imrek, J. A. B. Mates, K. M. Morgan, N. J. Ortiz, D. R. Schmidt, K. A. Schreiber, D. S. Swetz, J. N. Ullom
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引用次数: 0
摘要
X射线和（\gamma）-射线微量热仪中使用的超导过渡边传感器（TES），如果在足以在传感器中捕获磁通量的磁场B中冷却，其性能就会下降。我们报告了在采取措施减少来自低温恒温器内外的杂散 B 场之前和之后对 \(\gamma\)-ray TES 的测量结果。这些测量结果显示了 TES 电流-电压（IV）曲线中的异常特征与能量分辨率下降之间的相关性。在减少内部杂散 B 电场源和改善外部电场源屏蔽之后，IV 曲线和能量分辨率都得到了改善。最后，我们在不同类型的探测器封装中，在类似的伽马射线TES附近放置了残余场为10的磁化螺丝，并观察到了同样的效果。
Effects of Stray Magnetic Field on Transition-Edge Sensors in Gamma-Ray Microcalorimeters
Superconducting transition-edge sensors (TESs) used in X-ray and \(\gamma\)-ray microcalorimeters suffer degraded performance if cooled in a magnetic field B sufficient to trap flux in the sensors. We report measurements of \(\gamma\)-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 \(\upmu \textrm{T}\) near similar \(\gamma\)-ray TESs in a different type of detector package and observed the same effects.
期刊介绍：
The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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