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SUMMARY:Search for light WIMPs with BULLKID-DM experiment using monolithic
  arrays of detectors
DTSTART;VALUE=DATE-TIME:20260812T012000Z
DTEND;VALUE=DATE-TIME:20260812T014500Z
DTSTAMP;VALUE=DATE-TIME:20260824T154715Z
UID:indico-contribution-2669@indico.itp.ac.cn
DESCRIPTION:Speakers: Kangkang ZHAO (Gran Sasso Science Institute\, INFN-L
 NGS)\nBULLKID-DM is a cryogenic experiment designed for direct detection o
 f WIMP-like dark matter particles with a mass below 1 GeV/c$^{2}$. The det
 ector will consist of a stack of 16 intrinsic silicon wafers\, for a total
  mass of 800 g\, that are carved in 2320 active dice with a volume of 5.4$
 \\times$5.4$\\times$5 mm$^{3}$. Each die will be instrumented with multipl
 exed Kinetic Inductance Detectors (KIDs)\, acting as a particle absorber w
 ith an individual energy threshold of 200 eV or better. The array design e
 nables the volume fiducialization to improve background discrimination. \n
 To minimize the background signals from ambient radioactivities\, besides 
 using radiopure materials\, a comprehensive shielding system\, including a
  mixture of lead\, copper and neutron moderator material (𝐵4𝐶) that 
 placed both inside and outside the cryostat will be implemented. A cryogen
 ic anti-coincidence veto system is also designed to further suppress the e
 xternal gamma backgrounds. The veto system will use scintillating crystals
  and their light output is read out by phonon-mediated KIDs. The overall b
 ackground with the veto system is expected to be close to the zero-backgro
 und limit of 10$^{−2}$ counts / (keV kg day).\n\nThis work presents the 
 first operation of a 60 g demonstrator with 180 dice\, in a surface labora
 tory equipped with a lead and copper radiation shield. The recorded backgr
 ounds are in line with Geant4 simulations performed by the collaboration\,
  paving the path to the deployment of final 800 g array. Current efforts f
 ocus on the low-radioactivity detector mounting\, a cryogenic scintillatin
 g veto readout with KIDs\, in situ calibration techniques\, and detector u
 pgrades such as KIDs with dedicated phonon-collecting structures and germa
 nium substrates for multi-target capabilities.\nThe demonstrator is intend
 ed to be installed at the Gran Sasso underground laboratory (LNGS) by late
  2026\, following successful validation\, the full experiment is expected 
 to be commissioned in 2027.\n\nhttps://indico.itp.ac.cn/event/416/contribu
 tions/2669/
LOCATION:Conference Center (2F) Back Area
URL:https://indico.itp.ac.cn/event/416/contributions/2669/
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