Probing QCD Axion Dark Matter with the Grenoble Hybrid Magnet (Equipex LaSUP

Orateur : Pierre PUGNAT (LNCMI)

Résumé : An emerging collaboration between teams from CNRS/Université Grenoble Alpes, CAPP/IBS KAIST in South Korea, and CERN is studying a new haloscope for QCD Axion dark matter search. The modular hybrid magnet platform under construction at LNCMI-Grenoble will provide a magnetic field of 9 T in a room temperature bore of 812 mm diameter and 1.4 meter high. Combined with resistive magnets, various additional configurations of maximum field and bore diameter will be obtained such as 43/40 T in 34/50 mm diameter and 17/27 T in 375/170 mm diameter. Each of these magnet configurations will host various types of microwave cavity detectors for the Axion to photon resonant conversion via the inverse Primakoff effect following the Sikivie’s detection scheme. These RF cavities are presently under study at CAPP/IBS and will have a high quality factor Q = 105-106. Low-noise microwave amplification of the signal will be ensured by a DC superconducting quantum interference device (SQUID) or Josephson Parametric Amplifiers (JPA) developed at the Néel Institute and will be cooled-down to 20 mK by a 3He/4He dilution refrigerator to escape from thermal noise. This new modular haloscope will be designed to probe QCD dark matter Axions in the mass range 1-150 micro-eV with unprecedented sensitivity, i.e. with the diphoton coupling constant at low Axion mass reaching the theoretical prediction of the Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) model. For larger masses, the QCD Axion dark matter search can approach recent theoretical predictions coming from high-temperature lattice QCD calculations and the SMASH model. This new haloscope initiative has being presented to the Physics Beyond Collider working group at CERN to be included in the European road map of particle physics and will be submitted to the CERN/REC scientific committee to become a CERN recognized experiment.

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