BREAD is a reflector search for high mass axions. Axions in a strong magnetic field are converted to real photons emitted from the walls of a metal cylinder. The photons are collected by a reflector and focused to a spot where they are detected with very sensitive quantum sensors, such as SQUATs.
Recent BREAD publications:
GigaBREAD reflector
The GigaBREAD experiment being loaded into a 4T magnet at Argonne National Lab