Logo image
Back
Characterization of CRYO ASIC for charge readout in the nEXO experiment
Preprint

Characterization of CRYO ASIC for charge readout in the nEXO experiment

Z Li, M Yu, E Angelico, A Atencio, A Gupta, P Knauss, A Pena-Perez, B. G Lenardo, P Acharya, A Amy, …
ArXiv.org
11 Dec 2025
DOI: https://doi.org/10.48550/arxiv.2512.11116
url
https://doi.org/10.48550/arxiv.2512.11116View
Open

Abstract

Physics - Instrumentation and Detectors Physics - Nuclear Experiment
nEXO is a proposed next-generation experiment searching for the neutrinoless double beta decay of$^{136}$ Xe using a tonne-scale liquid xenon (LXe) time projection chamber (TPC). To image the ionization signals from events in the liquid xenon, the detector will employ metallized fused-silica charge collection tiles instrumented with cryogenic application-specific integrated circuits (ASICs), referred to as CRYO ASIC, which are designed to operate directly in LXe to minimize input capacitance and pick-up noise. Here we present the performance of the CRYO ASIC mounted on an auxiliary printed circuit board and evaluated both in a cryogenic environmental chamber and in a dedicated LXe test stand. We demonstrate that the ASICs achieve the desired performance at liquid xenon temperatures, showing a gain stability better than 0.2% over 24-hour operation and reliable in-situ calibration using an on-chip pulser. In the LXe test stand, we show that boiling caused by the chip heat dissipation can be mitigated by operating the system above ~0.1 MPa. The in-LXe noise measured agrees with simulation, which indicates it the$150~e^-$design requirement can be satisfied. These results establish CRYO ASIC as a viable low-noise in-LXe charge readout solution for nEXO.

Metrics

8 Record Views

Details

Logo image