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The RICOCHET reactor neutrino observatory is planned to be installed atInstitut Laue-Langevin starting in mid-2022. The scientific goal of theRICOCHET collaboration is to perform a low-energy and percentage-precisionCENNS measurement in order to explore exotic physics scenarios beyond thestandard model. To that end, RICOCHET will host two cryogenic detector arrays :the CryoCube (Ge target) and the Q-ARRAY (Zn target), both with unprecedentedsensitivity to O(10)eV nuclear recoils. The CryoCube will be composed of 27 Gecrystals of 38g instrumented with NTD-Ge thermal sensor as well as aluminumelectrodes operated at 10mK in order to measure both the ionization and theheat energies arising from a particle interaction. To be a competitive CENNSdetector, the CryoCube array is designed with the following specifications : alow energy threshold ($\sim 50$eV), the ability to identify and reject with ahigh efficiency the overwhelming electromagnetic backgrounds (gamma, betas,X-rays) and a sufficient payload ($\sim 1$kg). After a brief introduction ofthe future RICOCHET experiment and its CryoCube, the current works and firstperformance results on the optimization of the heat channel and the electrodedesigns will be presented. We conclude with a preliminary estimation of theCryoCube sensitivity to the CENNS signal within RICOCHET.

Optimization and performance of the CryoCube detector for the future RICOCHET low-energy neutrino experiment