Design optimization of MACHe3, a project of superfluid 3He detector for direct Dark Matter search

MAtrix of Cells of superfluid 3He (MACHe3) is a project of a new detector for direct Dark Matter (DM) search. A cell of superfluid 3He has been developed and the idea of using a large number of such cells in a high granularity detector is proposed. This paper presents, after a brief description of the superfluid 3He cell, the simulation of the response of different matrix configurations allowing to define an optimum design as a function of the number of cells and the volume of each cell. The background rejection, for several configurations, is presented both for neutrons and γ-rays of various kinetic energies.