Noise Modeling and Calibration of a Two-Stage Cryogenic Charge Amplifier for the SPLENDOR Experiment

2025/10/01 by Anczarski, Jadyn, Andrews, Owen, Aralis, Taylor +5
#FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det)

paper · doi:10.48550/arxiv.2510.01463

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.

Citations

• SPLENDOR: a novel detector platform to search for light dark matter with narrow-gap semiconductors
• Correcting impedance measurements for background parasitics to characterize circuit components in cryogenic environments
• First demonstration of 30 eVee ionization energy resolution with Ricochet germanium cryogenic bolometers
• Snowmass2021 Cosmic Frontier: The landscape of low-threshold dark matter direct detection in the next decade

Related

• SPLENDOR: a novel detector platform to search for light dark matter with narrow-gap semiconductors
• Calibration of the Cryogenic Measurement System of a Resonant Haloscope Cavity
• Sensing Few Electrons Floating on Helium with High-Electron-Mobility Transistors
• Low Noise Cold Electronics System for SBND LAr TPC
• Low-energy calibration of SuperCDMS HVeV cryogenic silicon calorimeters using Compton steps