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$\mathcal {O}$(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-follow HEMT at the base temperature stage and a voltage amplifier at 4 K, this amplifier has input-limited voltage noise of 10$\text{nV}/\sqrt{\text{Hz}}$and current noise of100$\text{aA}/\sqrt{\text{Hz}}$at 1kHz. In agreement with this noise level and a photon calibration, this amplifier has a$\text{19} \pm \text{4}$electron resolution.
Fields of Study & Subjects
Neutrino Physics Research
Astrophysics and Cosmic Phenomena
Dark Matter and Cosmic Phenomena
Publication details
- Journal / source
- IEEE Transactions on Applied Superconductivity
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Volume
- 36
- Issue
- 6
- Pages
- 1800306–1800306
- Publication date
- 13 April 2026
- Language
- EN