FLASH: a proposal for a 100-300 MHz haloscope

by Dr Claudio Gatti (INFN)

Wednesday 16 Oct 2024, 12:00 → 14:30 Europe/London

OLL/3-337 - Seminar Room (Liverpool Physics)

The axion, a pseudoscalar particle originally introduced to solve the ‘’strong CP problem’’, is a well motivated dark-matter candidate with a mass lying in a broad range from peV to few meV. Axions clustered inside our galaxy may be observed by means of detectors called “haloscopes” consisting in a resonant cavity immersed in a static magnetic field that triggers the axion conversion to microwave photons. 

After a brief introduction to axion physics, I will present the status and perspectives for axion dark-matter searches at INFN. I’ll show the recent results of QUAX, an INFN experiment that operates two haloscopes at the national laboratories in Frascati and Legnaro, and discuss how to improve them using quantum sensing.

Finally, I will present FLASH a large haloscope to be built by recycling a superconducting solenoid of 1.4 m radius, 2.2 m length and 1.1 T field at LNF. FLASH will probe axions with a mass around 1 micro-eV, as well as dark photons and high frequency gravitational waves. Recently, after the refurbishing of the cryogenic lines and of the control system, the magnet was energized with about 2700 ampere to generate, again after two decades, a 1.1 T field.