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T: Fachverband Teilchenphysik

T 34: Axionen I

T 34.2: Vortrag

Dienstag, 26. März 2019, 16:15–16:30, S09

Hunting Axion Dark Matter with MADMAX - Idea and First Proof of Principle Results — •Stefan Knirck for the MADMAX collaboration — Max-Planck-Institute for Physics, Munich, Germany

While the QCD axion was introduced to explain CP conservation in strong the interaction, it is also an excellent dark matter candidate. Axions could be detected using their conversion to photons at boundaries between materials of different dielectric constants in a strong magnetic field. Combining many such surfaces, one can enhance this conversion significantly using constructive interference and resonances. The proposed "Magnetized Disk and Mirror Axion eXperiment" (MADMAX) containing approximately 80 high dielectric disks with  1m diameter in a 10 T magnetic field could probe the well-motivated mass range of (40−400)µeV, a range which is at present inaccessible by existing cavity searches. After explaining the foundations of this approach, we present results from first proof of principle measurements. By comparing a 5 Sapphire disk setup with simulations, we demonstrate the needed disk positioning accuracy and show that the predicted electromagnetic properties are reproduced. We study systematic effects from antenna reflection, beam shape, tilts and others and conclude with an outlook for the final MADMAX setup.