Speaker
Description
BULLKID is a novel detector concept based on an array of particle absorbers sensed by multiplexed Kinetic Inductance Detectors (KIDs). The aim of this detector is to control the backgrounds by creating a fully active structure and by applying fiducialization
techniques.
Following the encouraging results from a 20 g prototype detector,
here we present the first operation of 3-wafer demonstrator array
(for a total of 60 g and 180 silicon dice), operated on surface with
a mild shield. The recorded background is here compared with Geant4
simulations conducted by the collaboration.
Currently, the collaboration is focused on building BULLKID-DM, a
new experiment aimed at searching for hypothetical WIMP-like Dark-Matter particles with mass around 1 GeV or below and cross-section with nucleons smaller than $10^{-41}$ cm$^{2}$.
The target of the BULLKID-DM experiment consists of a stack of BULLKID detectors and will amount to a total of 800~g subdivided in more than 2000 silicon dice.
Aside from BULLKID-DM, there is also an ongoing R\&D aimed at transferring this detector technology to a germanium substrate. Changing to a higher nuclear mass target is imperative for a possible CE$\nu$NS experiment based on the BULLKID detector concept. Due to the initial promising results on this experimental effort, studies of the potential of a germanium-based BULLKID array are being made and will be here presented.
Finally, we present the foreseen timeline and commissioning of the BULLKID-DM experiment, which will be deployed in the Gran Sasso national laboratories.
