The axion dark matter search: a comprehensive approach
Tuesday 31 May 2016
to 14:30 at
Yannis Semertzidis (KAIST-CAPP)
Axions are the result of a dynamic field, similar to Higgs field, invented to solve the so-called Strong CP-problem, i.e., why the electric dipole moment of the neutron has not been observed so far even though the theory of QCD suggests otherwise. Axions as dark matter can be thought of as an oscillatory field interacting very weakly with normal matter other than gravitationally. The oscillation frequency is unknown, it can be anywhere between 200MHz to 200GHz and it’s expected to be a very narrow line, about df/f=10^-6. A very strong magnetic field can be used to convert part of that field into a very weak electric field oscillating at the same frequency as the axion field. In the coming years we plan to develop our experimental sensitivity to either observe or refute the axions as a viable dark matter candidate. That approach includes the development of ultra strong magnets, high quality resonators in the presence of strong B-fields, new resonator geometries, low noise cryo-amplifiers and new techniques of detecting axions. In addition, using the strong CAST LHC dipole field we will be able to search for dark matter axions in the 4 to 6 GHz range in the immediate future.