Accurate Thermal Conductance and Impedance Measurements of Transition Edge Sensors

Lindeman, M. A.; Barger, Kat; Brandl, D. E.; Crowder, S. G.; Rocks, L.; McCammon, D.

doi:10.1007/s10909-007-9616-2

Cited by 7 publications

(8 citation statements)

References 4 publications

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“…We will also try taking our I-V data while amplitude modulating the bias current at several frequencies, following the method developed by Lindeman et al 8,9 This will allow continuous acquisition of A ( w ) admittance measurements at every operating point. The results should allow us to derive α and β directly (the separately determined G ( T ) is required for α ), without the necessity of taking differences to get the derivatives.…”

Section: Resultsmentioning

confidence: 99%

“…We first determined the thermal conductance from the TES to the substrate G ( T ) from a set of points with the same R , choosing an R near the top of the transition where it has almost no I -dependence. 8 Those points therefore have a constant T TES , and the dependence of TES power on T base can be used to determine G ( T ). This G ( T ) was used to calculate the TES temperature T for each point on the IV curves by integrating the dissipated power divided by G ( T ) from the known substrate temperature up to T TES , resulting in a densely measured T ( I, V ) surface as shown in Fig.…”

Section: R(t I Bext) Mappingmentioning

confidence: 99%

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Mapping of the resistance of a superconducting transition edge sensor as a function of temperature, current, and applied magnetic field

Zhang

Eckart

Jaeckel

et al. 2017

Journal of Applied Physics

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We have measured the resistance R(T, I, Bext) of a superconducting transition edge sensor over the entire transition region on a fine scale, producing a 4-dimensional map of the resistance surface. The dimensionless temperature and current sensitivities (α≡∂logR/∂logT|Iandβ≡∂logR/∂logI|T) of the TES resistance have been determined at each point. α and β are closely related to the sensor performance, but show a great deal of complex, large amplitude fine structure over large portions of the surface that is sensitive to the applied magnetic field. We discuss the relation of this structure to the presence of Josephson “weak link” fringes.

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Section: Resultsmentioning

confidence: 99%

Section: R(t I Bext) Mappingmentioning

confidence: 99%

Mapping of the resistance of a superconducting transition edge sensor as a function of temperature, current, and applied magnetic field

Zhang

Eckart

Jaeckel

et al. 2017

Journal of Applied Physics

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“…TES size, decreases. This highly current-dependent transition shape makes the determination of G challenging [11], as we no longer expect our data to be consistent with (1) globally. To accurately interpret measurements, it is crucial to calculate G at many discrete points through the TES transition by iterating the procedure described earlier in this section for many TES resistances.…”

Section: Determining G Considering Weak Link Effectsmentioning

confidence: 58%

Implications of Weak Link Effects on Thermal Characteristics of Transition-Edge Sensors

et al. 2012

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2: Implications of weak link effects on thermal characteristics of transition-edge sensors Weak link behavior in transition-edge sensor (TES) devices creates the need for a more careful characterization of a device's thermal characteristics through its transition. This is particularly true for small TESs where a small change in the measurement current results in large changes in temperature. A highly current-dependent transition shape makes accurate thermal characterization of the TES parameters through the transition challenging. To accurately interpret measurements, especially complex impedance, it is crucial to know the temperature-dependent thermal conductance, G(T), and heat capacity, C(T), at each point through the transition. We will present data illustrating these effects and discuss how we overcome the challenges that are present in accurately determining G and T from IV curves. We will also show how these weak link effects vary with TES size.https://ntrs.nasa.gov/search.jsp?R=20110013025 2018-05-11T09:57:01+00:00Z

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“…Moreover, the fact that the characteristic temperature of the initial resistance drop remains nearly constant, whereas the onset of dissipation shifts significantly towards lower temperatures with rising current, indicates that care must be taken when defining the critical temperature and the transition width, since the values obtained at low current (from the basic R(T) characterization of the TES transition) may not be suitable for higher currents (biased TES). Also, the validity of the thermal equation ( ) = ( − ), most often used to extract the TES thermal parameters from the I-V curves, is questionable, as already shown first by Lindeman et al [30] and later by Bailey et al [31] when analysing weak link effects. Indeed, the strong dependence of the resistive transition on the external electrical current observed here would have similar consequences to those arising from the weak link dependence.…”

Section: Impact Of the Observed R(ti) On Tesmentioning

confidence: 99%

Large current-induced broadening of the superconducting transition in Mo/Au transition edge sensors

Fàbrega¹,

Camón²,

Pobes³

et al. 2018

Supercond. Sci. Technol.

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The R(T,I) shape of the superconducting transition in Transition Edge Sensors (TES) is of crucial importance to determine their ultimate performance. This paper reports a study of the temperature and current dependences of the transition of Mo/Au TESs, focused on the low resistance region, where these devices preferentially operate. A large broadening of the transition is observed when increasing the applied current. An empirical analytic expression for R(T,I) is found, which describes the transition of devices with different critical temperatures, from R=0 up to at least 30% Rn (in some cases nearly 80% Rn). Several mechanisms for this behaviour are considered; results show that a current assisted vortex pair unbinding mechanism (Berezinskii-Kosterlitz-Thouless transition) could be the possible origin for this behaviour. Finally, the consequences of the current-induced transition broadening for TES properties and operation are outlined.

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Accurate Thermal Conductance and Impedance Measurements of Transition Edge Sensors

Cited by 7 publications

References 4 publications

Mapping of the resistance of a superconducting transition edge sensor as a function of temperature, current, and applied magnetic field

Mapping of the resistance of a superconducting transition edge sensor as a function of temperature, current, and applied magnetic field

Implications of Weak Link Effects on Thermal Characteristics of Transition-Edge Sensors

Large current-induced broadening of the superconducting transition in Mo/Au transition edge sensors

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