Optimization of Cryogenic Detector Test Station by Rejecting Electromagnetic Interference

TL;DR

This paper presents an optimized method for characterizing SNSPDs by effectively rejecting electromagnetic interference, thereby improving measurement stability and enabling more accurate device testing at low bias currents.

Contribution

The paper introduces a novel EMI rejection technique that enhances SNSPD measurement stability and reliability, especially at low bias currents, facilitating better device characterization.

Findings

Enhanced measurement stability in SNSPDs due to EMI rejection

Successful application to alpha particle detection with stable signals

Foundation laid for further SNSPD characterization with various particles

Abstract

We report on the solution optimized for characterizing SNSPDs by rejecting electromagnetic interference from various sources. The proposed readout method enhances measurement stability and enables reliable device characterization at low bias currents, where the signal-to-noise ratio is typically limited. By effectively suppressing EMI-induced noise, the method improves the ability to distinguish genuine detection events from spurious signals and reduces the effort required for data analysis. The approach has been applied to preliminary measurements of SNSPDs exposed to $\alpha$ particles emitted from a $^{241}$Am source, demonstrating stable operation and clean signal acquisition. While a detailed study of $\alpha$ detection is underway, the method establishes a foundation for further characterization of SNSPDs with various incident particles. The demonstrated EMI rejection technique is expected to facilitate future research in particle detection and support ongoing SNSPD development for applications in nuclear and accelerator-based experiments.