title: Study of the Dependency on Magnetic Field and Bias Voltage of an AC-Biased TES Microcalorimeter.
abstract: 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 ΔEFWHM=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.
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: L
authors.initials: L
authors.lastname: Gottardi
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: J
authors.initials: J
authors.lastname: Adams
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: C
authors.initials: C
authors.lastname: Bailey
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: S
authors.initials: S
authors.lastname: Bandler
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Bruijn
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: J
authors.initials: J
authors.lastname: Chervenak
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: M
authors.initials: M
authors.lastname: Eckart
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: F
authors.initials: F
authors.lastname: Finkbeiner
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: den Hartog
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Hoevers
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: R
authors.initials: R
authors.lastname: Kelley
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: C
authors.initials: C
authors.lastname: Kilbourne
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: P
authors.initials: P
authors.lastname: de Korte
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: van der Kuur
authors.affiliation: SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
authors.forename: M
authors.initials: M
authors.lastname: Lindeman
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: F
authors.initials: F
authors.lastname: Porter
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: J
authors.initials: J
authors.lastname: Sadlier
authors.affiliation: NASA GSFC, Greenbelt Road, Greenbelt, MD 20771 USA.
authors.forename: S
authors.initials: S
authors.lastname: Smith
keywords: LC resonator; SQUID; TES; rf-SQUID; x-ray detector