Skipper-CCD Sensors for the Oscura Experiment: Requirements and Preliminary Tests
physics.ins-det
/ Authors
Brenda A. Cervantes-Vergara, Santiago Perez, Juan Estrada, Ana Botti, Claudio R. Chavez, Fernando Chierchie, Nathan Saffold, Alexis Aguilar-Arevalo, Fabricio Alcalde-Bessia, Nicolás Avalos
and 45 more authors
Oscar Baez, Daniel Baxter, Xavier Bertou, Carla Bonifazi, Gustavo Cancelo, Nuria Castelló-Mor, Alvaro E. Chavarria, Juan Manuel De Egea, Juan Carlos D'Olivo, Cyrus Dreyer, Alex Drlica-Wagner, Rouven Essig, Ezequiel Estrada, Erez Etzion, Paul Grylls, Guillermo Fernandez-Moroni, Marivi Fernández-Serra, Santiago Ferreyra, Stephen Holland, Agustín Lantero Barreda, Andrew Lathrop, Ian Lawson
/ Abstract
Oscura is a proposed multi-kg skipper-CCD experiment designed for a dark matter (DM) direct detection search that will reach unprecedented sensitivity to sub-GeV DM-electron interactions with its 10 kg detector array. Oscura is planning to operate at SNOLAB with 2070 m overburden, and aims to reach a background goal of less than one event in each electron bin in the 2-10 electron ionization-signal region for the full 30 kg-year exposure, with a radiation background rate of 0.01 dru. In order to achieve this goal, Oscura must address each potential source of background events, including instrumental backgrounds. In this work, we discuss the main instrumental background sources and the strategy to control them, establishing a set of constraints on the sensors' performance parameters. We present results from the tests of the first fabricated Oscura prototype sensors, evaluate their performance in the context of the established constraints and estimate the Oscura instrumental background based on these results.