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Skipper-CCD sensors for the Oscura experiment: requirements and preliminary tests

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.[1 dru (differential rate unit) corresponds to 1 event/kg/day/keV.] 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.

 Fuente: Journal of Instrumentation, 2023, 18(8), P08016

 Editorial: Institute of Physics

 Fecha de publicación: 01/08/2023

 Nº de páginas: 23

 Tipo de publicación: Artículo de Revista

 DOI: 10.1088/1748-0221/18/08/P08016

 ISSN: 1748-0221

 Url de la publicación: https://doi.org/10.1088/1748-0221/18/08/P08016

Autoría

CERVANTES-VERGARA, BRENDA A.

PEREZ, SANTIAGO

ESTRADA, JUAN

BOTTI, ANA

CHAVEZ, CLAUDIO R.

CHIERCHIE, FERNANDO

SAFFOLD, NATHAN

AGUILAR-AREVALO, ALEXIS

ALCALDE-BESSIA, FABRICIO

AVALOS, NICOLÁS

BAEZ, OSCAR

BAXTER, DANIEL

BERTOU, XAVIER

BONIFAZI, CARLA

CANCELO, GUSTAVO

NURIA CASTELLÓ MOR

CHAVARRIA, ALVARO E.

DE EGEA, JUAN MANUEL