A constant temperature TES microcalorimeter with an external electronic feedback system

Computer Science – Performance

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Superconducting Device Characterization, Design, And Modeling

Scientific paper

One major problem with TES micro-calorimeters is the very narrow temperature range in which they work. To detect high energy events the heat capacity of the detector must be sufficiently large to keep the sensor running in its sensitive region. The large heat capacity limits the best energy resolution that can be obtained. One way to avoid a saturation effect while keeping the heat capacity small is to run the detector at constant temperature, reducing the power dissipated into it by an amount equal to the power conducted into the thermometer from the energy deposition. We studied the possibility of such a detector using an external electronic feedback system (EEF) [1,2] that reduces the bias voltage on the sensor. Using traditional electro-thermal feedback to run a constant temperature detector, the signal amplitude can be reduced, but the noise of the readout electronics does not change and this may worsen the energy resolution. Moreover the gain of the feedback, determined by the thermometer sensitivity alpha, may not be large enough to keep the temperature constant. With external feedback, the noise of the readout electronics is reduced proportionally to the signal and the feedback can be made larger. In this paper we outline the characteristics of such a system, investigate its performances and discuss our optimization efforts. .

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