Speaker
Description
The nEXO project spearheads scientific exploration with a primary focus on unraveling the mysteries of neutrinoless double-beta (0vββ) decay, offering profound insights into fundamental particle physics. At its core, the nEXO experiment employs a single-phase liquid xenon (LXe) time projection chamber (TPC), housing ~5000 kg of xenon enriched to 90% in the isotope 136. This cutting-edge detector is pivotal for conducting one of the most sensitive searches for this rare decay, deemed a top priority by the nuclear physics community.
Tailored for nEXO, the CRYO ASIC serves as the charge readout, processing signals within the liquid xenon chamber for the study of 0νββ and other rare events. The ASIC features a compact system-on-chip (SoC) design, with a small 7mm x 9mm form factor. It amplifies and digitizes signals generated from the LXe TPC, facilitating the transmission of digital data to the DAQ boards for further analysis. Engineered to operate reliably in extreme cryogenic environments, the CRYO ASIC demonstrates promising performance in liquid xenon during its R&D prototyping phase, approaching compliance with the nEXO’s stringent requirements.
In this talk, we will delve into the cryogenic test bench system designed for ASIC characterization at the University of California San Diego (UCSD). We will present experimental results in both gas xenon and liquid xenon environments. The discussion will also encompass the ASIC architecture, highlighting potential enhancements for its final implementation. The emphasis will be on further simplifying the I/O requirements at the system level and ensuring alignment with nEXO's low radiopurity specifications.
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