Noise Modeling and Calibration of a Two-Stage Cryogenic Charge Amplifier for the SPLENDOR Experiment
Abstract
The SPLENDOR Collaboration studies novel narrow-gap semiconductors and engineered a substrate agnostic detector platform to achieve O(meV) energy sensitivity designed for low mass dark matter searches. This was achieved using low-capacitance and low-noise commercial CryoHEMTs in a split-stage topology integrated throughout a dilution refrigerator. Designed with a source-follower HEMT at the base temperature stage and a voltage amplifier at 4\,K, this amplifier has input-limited voltage noise of 10 nV/Hz and current noise of 100 aA/Hz at 1kHz. In agreement with this noise level and a photon calibration, this amplifier has a 19 4 electron resolution.
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