Characterization of a High-Performance Ti/Au TES Microcalorimeter with a Central Cu Absorber

Takei, Yoh; Gottardi, L.; Hoevers, H.; Korte, P. A. J. de; Kuur, J. van der; Ridder, M.; Bruijn, M. P.

doi:10.1007/s10909-007-9621-5

Cited by 24 publications

(28 citation statements)

References 5 publications

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“…By this we mean that the resulting cut-off frequency of the ITFN noise due to the hanging block is near the electrical cut-off of the readout, so that we can observe its effect in the measured data. Our data, therefore, agrees with the previous suggestion that a large ITFN noise exists in Ti/Au TESs 5,17 .…”

Section: Conclusion and Discussionsupporting

confidence: 93%

Normal metal-superconductor decoupling as a source of thermal fluctuation noise in transition-edge sensors

Kinnunen

Palosaari

Maasilta

2012

Journal of Applied Physics

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We have studied the origin of excess noise in superconducting transition-edge sensors (TES) with several different detector designs. We show that most of the observed noise and complex impedance features can be explained by a thermal model consisting of three bodies. We suggest that one of the thermal blocks and the corresponding thermal fluctuation noise arises due to the high-frequency thermal decoupling of the normal and superconducting phase regions inside the TES film. Our results are also consistent with the prediction that in thin bilayer proximitized superconductors, the jump in heat capacity at the critical temperature is smaller than the universal BCS theory result.

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Section: Conclusion and Discussionsupporting

confidence: 93%

Normal metal-superconductor decoupling as a source of thermal fluctuation noise in transition-edge sensors

Kinnunen

Palosaari

Maasilta

2012

Journal of Applied Physics

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“…Measurements were performed in a compact plastic dilution refrigerator at Jyväskylä, with an old NIST SQUID readout [11] and a FLL electronics unit designed at SRON. The complex impedance was measured up to 100 kHz, taking into account of the transfer function of the readout circuit [12].…”

Section: Experiments and Analysismentioning

confidence: 99%

Analysis of Impedance and Noise Data of an X-Ray Transition-Edge Sensor Using Complex Thermal Models

et al. 2012

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The so-called excess noise limits the energy resolution of transition-edge sensor (TES) detectors, and its physical origin has been unclear, with many competing models proposed. Here we present the noise and impedance data analysis of a rectangular X-ray Ti/Au TES fabricated at SRON. To account for all the major features in the impedance and noise data simultaneously, we have used a thermal model consisting of three blocks of heat capacities, whereas a two-block model is clearly insufficient. The implication is that, for these detectors, the excess noise is simply thermal fluctuation noise of the internal parts of the device. Equations for the impedance and noise for a three-block model are also given.

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“…A simple two body model [8] is used to fit the impedance data and to derive the parameters, like β, loop gain L o = P o α/GT and time constant τ o = C/G, needed to estimate the detector responsivity. A distributed model would provide a more accurate estimation of those parameters [9].…”

Section: Characterization Of a Low Noise Bolometer At 13 Mhz In A Pimentioning

confidence: 99%

AC Bias Characterization of Low Noise Bolometers for SAFARI Using an Open-Loop Frequency Domain SQUID-based Multiplexer Operating Between 1 and 5 MHz

et al. 2012

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SRON is developing the Frequency Domain Multiplexing (FDM) read-out and the ultra low NEP TES bolometers array for the infra-red spectrometer SAFARI on board of the Japanese space mission SPICA. The FDM prototype of the instrument requires critical and complex optimizations. For single pixel characterization under AC bias we are developing a simple FDM system working in the frequency range from 1 to 5 MHz, based on the open loop read-out of a linearized two-stage SQUID amplifier and high Q lithographic LC resonators. We describe the details of the experimental set-up required to achieve low power loading (<1 fW) and low noise (NEP ∼ 10 −19 W/ √ Hz) in the TES bolometers. We conclude the paper by comparing the performance of a 4 × 10 −19 W/ √ Hz TES bolometer measured under DC and AC bias.

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Characterization of a High-Performance Ti/Au TES Microcalorimeter with a Central Cu Absorber

Cited by 24 publications

References 5 publications

Normal metal-superconductor decoupling as a source of thermal fluctuation noise in transition-edge sensors

Normal metal-superconductor decoupling as a source of thermal fluctuation noise in transition-edge sensors

Analysis of Impedance and Noise Data of an X-Ray Transition-Edge Sensor Using Complex Thermal Models

AC Bias Characterization of Low Noise Bolometers for SAFARI Using an Open-Loop Frequency Domain SQUID-based Multiplexer Operating Between 1 and 5 MHz

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