Speakers
Description
BULLKID-DM is a cryogenic experiment, carried out at the Laboratori Nazionali del Gran Sasso (LNGS) in
Italy, that will search for ≤ 1GeV/c2WIMP dark matter particles with nucleon cross-sections below 10−41cm2.The
main detector consists of an 800g array of over 2000 silicon dice, each acting as a particle absorber instrumented
with multiplexed Kinetic Inductance Detectors (KIDs). The experiment is designed to probe energy deposits in the
region (200 eV - 5 keV).
For rare-event search experiments such as BULLKID-DM, it is crucial to minimise background signals from
muons, photons and neutrons. One possible way to achieve such low background is to use a cryogenic anti-
coincidence veto system. The veto consists of a tessellated structure of scintillating crystals whose light output is
read out by phonon-mediated KIDs.
Another main challenges of the experiment is the development of an in-situ calibration system. Given the
multiple layers of shielding materials and the cryogenic veto that surround the experiment, introducing a calibration
source in the proximity of the detector is non-trivial. We intend to use the X-rays from an 241Am source which
needs to be accurately positioned and needs to be easily stowed away.
These two subsystems are currently being developed at the Pisa section of the National Institute for Nuclear
Physics (INFN) and will be the object of this contribution