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Speaker: Xiaochen Ni (University of Washington) – Title: Development of TopmetalSe: CMOS/aSe Hybrid Detectors for Neutrino Physics
November 20 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: November 20, 2025
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Xiaochen Ni (University of Washington)
Title: Development of TopmetalSe: CMOS/aSe Hybrid Detectors for Neutrino Physics
Abstract: The Selena experiment couples an amorphous selenium (aSe) ionization target to a complementary metal–oxide–semiconductor (CMOS) pixel array as an imaging detector for next-generation neutrino physics. Hybrid a-Se/CMOS detectors provide a unique combination of high-Z stopping power, direct charge conversion, and fine-pitch pixel imaging. These properties enable precise reconstruction of ionization tracks with excellent spatial resolution, allowing for low-background measurements with advanced event classification. In this talk, I will present Selena’s capabilities for a neutrinoless double-beta decay search and share the ongoing detector R&D, including the design, fabrication, and characterization of its first prototype pixel array, TopmetalSe, produced in the SkyWater 130 nm open-source CMOS process.
https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239