Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 167, Issue 3-4, Pages 214-219Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-012-0494-x
Keywords
x-ray detector; SQUID; rf-SQUID; TES; LC resonator
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At SRON we are studying the performance of a Goddard Space Flight Center single pixel TES microcalorimeter operated in an AC bias configuration. For x-ray photons at 6 keV the pixel shows an x-ray energy resolution Delta E (FWHM) =3.7 eV, which is about a factor 2 worse than the energy resolution observed in an identical DC-biased pixel. In order to better understand the reasons for this discrepancy we characterised the detector as a function of temperature, bias working point and applied perpendicular magnetic field. A strong periodic dependency of the detector noise on the TES AC bias voltage is measured. We discuss the results in the framework of the recently observed weak-link behaviour of a TES microcalorimeter.
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