Modelling and reduction of noise in transition edge sensor detectors

摘要

Current and future astronomical detectors based on Transition Edge Sensors (TESs) need to achieve theoreticallypredicted current noise performance determined by the sum of contributions from thermal noise in the link to theheat bath, Johnson noise in the sensor itself and noise in the electrical readout circuit. Present TES geometriescan have noise levels significantly above this limit. Our Mo/Cu bilayer TESs are fabricated on long, narrow,thermally isolating silicon nitride structures and are designed for operation at 360 or 200 mK. We briefly reviewthe likely sources of the additional noise sources in this geometry and show results of measurements and modellingof the noise sources as the TES geometry is modified for TESs operated at both temperatures.