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We present a proposal for a new experiment, the FINUDA magnet for Light AxionSearcH (FLASH), a large resonant-cavity haloscope in a high static magneticfield which is planned to probe new physics in the form of dark matter (DM)axions, scalar fields, chameleons, hidden photons, as well as high frequencygravitational waves (GWs). Concerning the QCD axion, FLASH will search forthese particles as the DM in the mass range (0.49-1.49) ueV, thus filling themass gap between the ranges covered by other planned searches. A dedicatedMicrostrip SQUID operating at ultra-cryogenic temperatures will amplify thesignal. The frequency range accessible overlaps with the Very High Frequency(VHF) range of the radio wave spectrum and allows for a search in GWs in thefrequency range (100-300) MHz. The experiment will make use of the cryogenicplant and magnet of the FINUDA experiment at INFN Frascati NationalLaboratories near Rome (Italy); the operations needed to restore thefunctionalities of the apparatus are currently underway. We present the setupof the experiment and the sensitivity forecasts for the detection of axions,scalar fields, chameleons, hidden photons, and GWs.

The future search for low-frequency axions and new physics with the FLASH resonant cavity experiment at Frascati National Laboratories