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

Abstract

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

Demonstration of Fine-Pitch High-Resolution X-ray Transition-Edge Sensor Microcalorimeters Optimized for Energies below 1 keV

“…We first measured the fundamental characteristics of the TES. The experimental setup is described elsewhere [5]. From measurements of I(V) at various bath temperatures, the TES Joule heating P 0 = R 0 I 2 0 , where R 0 is the TES resistance and I 0 is the TES current, was calculated for each bath temperature.…”

Characterization of a hybrid array of single and multi-absorber transition-edge sensor microcalorimeters for the Line Emission Mapper

“…Gbath was calculated from fitting TES power as a function of heat bath temperature Tbath at a bias point in the transition of R/Rn=90%, where Rn is the normal state resistance of the TES. Calculating Gbath at this large value of R/Rn has been shown to be more accurate for small TESs 24 , 25 . From these measurements, we calculate Gbath(Tc)=21 pW/K and 48 pW/K for the single-pixel and hydra, respectively, where Tc is defined as T at R/Rn=10%.…”

“…Calculating G bath at this large value of R∕R n has been shown to be more accurate for small TESs. 24,25 From these measurements, we calculate G bath ðT c Þ ¼ 21 pW∕K and 48 pW∕K for the single-pixel and hydra, respectively, where T c is defined as T at R∕R n ¼ 10%. The approximately two times larger G bath in the hydra compared with the single-pixel is expected because the larger banks, additional Au links, and increased number of absorber stems mean that there is an approximately two times larger phonon emitting perimeter.…”

Transition-edge sensors using Mo/Au/Au tri-layer films

“…4(c), and determined the thermal conductance G to the heat bath using the following first equation. [19] T 0 is the detector temperature at the working point (80% R n ), G(T 0 ) is the thermal conductance at that temperature, and n is the exponent of the power flow to the heat bath. The three parameters can be fitted from the curves plotted in Fig.…”