(a) Thermal circuit and (b) electrical circuit of an ideal TES.
Thermal model previously used to derive ETF parameters of a two-square TES operated at and to model the dynamics.
Photographs of the three TES geometries investigated: (a) shows a two-square TES with Nb wiring and longitudinal Cu bars, (b) shows a one-square design with longitudinal bars, and (c) shows a two-square TES with longitudinal and partial lateral bars. In each device, resistively terminated microstrip lines to apply dc power to the nitride island and the TES can be seen.
The extended electrothermal model used to analyze the noise. The upper part of the figure indicates the electrical circuit, and the lower part the thermal circuit. Dots indicate replicated elements.
Noise plots as a function of TES bias voltage for a two-square TES with no lateral bars and a transition temperature of . Note the change in the current-noise scale between the upper and lower plots. The inset shows heat capacity data for our membranes taken from Ref. 19.
Noise plots as a function of TES bias voltage for a one-square TES without Cu bars and a transition temperature of . Note the change in vertical scale compared to Fig. 5.
Noise plots as a function of TES bias voltage for a two-square TES with partial Cu bars and a transition temperature of .
Contributions to the total calculated current noise in Fig. 5(c) in the upper plot and Fig. 7(a) in the lower plot. The solid lines indicate noise in the link to the bath , dashed lines from Johnson noise in the TES, dotted lines from the internal conductance of the TES , dash-dots from the conductance of the island , and wide dashes Johnson noise in the bias resistor .
Calculated values for the TES heat capacities and conductances. is the normal-state heat capacity of the Mo–Cu, and is the total heat capacity of Cu bars. values are measured.
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