Physics Opportunities at 100-500 MHz Haloscopes



Babette Dobrich (CERN), Carlo Ligi (INFN - LNF), Claudio Gatti (INFN e Laboratori Nazionali di Frascati (IT)), Giovanni Mazzitelli (INFN)

In the last decade an increasing interest in axion and axion-like particles as a possible explanation to the nature of the dark matter in our galaxy led to the proposal of several experiments aiming at their detection. Among these, KLASH [1], now evolved into FLASH, and babyIAXO-RADES [2] are two haloscopes proposed to operate in the frequency region between 100 and 500 MHz, corresponding to the mass region between 0.5 and 2 micro-eV. While being away from the preferred region for QCD-axions (10<ma<100 micro-eV), the search is still motivated by pre-inflationary models, models with modified cosmological-evolution or in extended-axion models. The workshop is intended to review the theoretical motivations and the experimental prospects to probe this mass region by experiments such as ADMX, Abracadabra, DMRadio and Casper as well as FLASH and babyIAXO-RADES. Furthermore, results from axion experiments have been recently used to set limits on high frequency gravitational waves (HFGW)[3-4-5] and new ideas have been proposed to use haloscope-like detectors for their detection[6-7]. Having detectors of meter size and strong magnetic fields, FLASH and babyIAXO-RADES could be particularly suitable for HFGW detection. This possibility will be further investigated during the workshop.

1.The KLASH Conceptual Design Report


3.A. Ejilli et al. Eur. Phys. J. C. (2019) 79:1032.

4.A. Ito et al. Eur. Phys. J. C. (2020) 80:179.

5.N. Aggrawal et al. arXiv:2011.12414.

6.N. Herman et al. Phys. Rev. D 104, 023524 (2021).

7. A. Berlin et al arXiv:2112.11465


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  • Thursday, February 17
    • 2:00 PM 2:10 PM
      welcome 10m
      Speaker: Fabio Bossi
    • 2:10 PM 2:40 PM
      The physics case for axion searches in the mass range 0.5-2 micro-eV 30m
      Speakers: Enrico Nardi (INFN e Laboratori Nazionali di Frascati (IT)), Enrico Nardi
    • 2:40 PM 2:48 PM
      discussion 8m
    • 2:48 PM 3:18 PM
      Upper limits on HFGW from graviton to photon conversion 30m
      Speaker: Aldo Ejlli (Cardiff University)
    • 3:18 PM 3:26 PM
      discussion 8m
    • 3:26 PM 3:56 PM
      Detecting High-Frequency Gravitational Waves with Microwave Cavities 30m
      Speakers: Diego Blas, Diego Blas Temino (Ecole Polytechnique Federale de Lausanne (CH)), Diego Blas Temino (King's College London)
    • 3:56 PM 4:04 PM
      discussion 8m
    • 4:05 PM 4:35 PM
      combined Abra & DM Radio 30m
      Speaker: Lindley Winslow
    • 4:35 PM 4:43 PM
      discussion 8m
    • 4:43 PM 5:13 PM
      FLASH, a proposal for a 100-300 MHz Haloscope 30m
      Speaker: Claudio Gatti (INFN e Laboratori Nazionali di Frascati (IT))
    • 5:15 PM 5:30 PM
      discussion and close-out day1 15m
  • Friday, February 18
    • 10:00 AM 10:30 AM
      High-frequency GW sources and GW searches with low-mass axion haloscopes 30m
      Speaker: Valerie Domcke (CERN)
    • 10:30 AM 10:40 AM
      discussion 10m
    • 10:40 AM 11:10 AM
      Probing gravitational waves with graviton-magnon resonance 30m
      Speakers: Asuka Ito (Tokyo institute of technology), Asuka Ito (Kobe University)
    • 11:10 AM 11:20 AM
      discussion 10m
    • 11:20 AM 11:50 AM
      ADMX, status and prospects for low mass searches 30m
      Speaker: Ben McAllister
    • 11:50 AM 12:00 PM
      discussion 10m
    • 12:00 PM 12:30 PM
      RADES at babyIAXO in the 400Mhz frequency range 30m
      Speaker: Alejandro Díaz-Morcillo (Universidad Politécnica de Cartagena)
    • 12:30 PM 12:40 PM
      discussion 10m
    • 12:40 PM 2:00 PM
      lunch 1h 20m
    • 2:00 PM 2:30 PM
      Large Volume Cryogenic Experiments 30m
      Speakers: Paolo Gorla, Paolo Gorla
    • 2:30 PM 2:40 PM
      discussion 10m
    • 2:40 PM 3:10 PM
      The Microstrip SQUID Amplifier 30m
      Speaker: Michael Mueck
    • 3:10 PM 3:20 PM
      discussion 10m
    • 3:20 PM 3:50 PM
      Dielectric-Loaded Cavities for ADMX Low-Frequency Searches 30m
      Speaker: Hassan Mohamed Awida
    • 3:50 PM 4:00 PM
      discussion 10m
    • 4:00 PM 4:30 PM
      Casper, status and prospects 30m
      Speakers: DMITRY BUDKER (Helmholtz Institute Mainz and UC Berkeley), Hendrik Bekker (Mainz)
    • 4:30 PM 4:40 PM
      discussion 10m
    • 4:40 PM 5:10 PM
      Axion-mass prediction 30m
      Speakers: Ben Safdi (Princeton University), Benjamin Safdi (massachusetts institute of technology)
    • 5:10 PM 5:30 PM
      discussion and close-out 20m