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SUMMARY:Cosmological Axion Sarov Haloscope (CASH): search for dark-matter 
 axions beyond the quantum limit. Status and Preparation for the First Stag
 e.
DTSTART;VALUE=DATE-TIME:20261028T074500Z
DTEND;VALUE=DATE-TIME:20261028T080000Z
DTSTAMP;VALUE=DATE-TIME:20261027T050034Z
UID:indico-contribution-6288@cern.ch
DESCRIPTION:Speakers: Petr Satunin (INR RAS)\nRecently [Phys. Rev. D 112 (
 2025) 035003\; arXiv:2506.18595 [hep-ph]]\, we proposed an experimental pr
 oject called the Cosmological Axion Sarov Haloscope (CASH)\, aimed at sear
 ching for dark-matter axions via their conversion into microwave photons i
 n a magnetic field. The key feature of the experiment is the use of Joseph
 son-junction single-photon detectors (JJ SPDs) operating at ultralow tempe
 ratures\, where thermal noise is negligibly small. This allows us to probe
  the axion–photon coupling with ultrahigh precision\, with sensitivity t
 o gaγγ∼(10^{−14}–10^{−15}) GeV^{−1} for axion masses in the 
 range 38–54 μeV\, motivated by generic QCD axion models.\n\nIn this tal
 k\, we also describe the current preparation for the launch of the first s
 tage of the experiment: measurements of the parameters of fabricated JJ SP
 Ds and a high-quality-factor cavity. In addition\, we discuss the design f
 eatures of tunable cavities and existing prototypes.\n\nhttps://indico.par
 ticle.mephi.ru/event/626/contributions/6288/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6288/
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