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T: Fachverband Teilchenphysik

T 38: Neutrinos, Dark Matter V

T 38.3: Talk

Tuesday, March 21, 2023, 17:30–17:45, HSZ/0002

In-place optimization of a dielectric haloscope for axion dark matter detection, MADMAX — •Dominik Bergermann for the MADMAX collaboration — RWTH Aachen University, Physics Institute III A

The axion is a promising candidate to explain cold dark matter and the absence of CP violation in strong interaction. The MAgnetized Disc and Mirror Axion eXperiment is a planned experiment which intends to probe axion dark matter in a mass range of 40 to 400 µeV. It is a dielectric microwave haloscope utilizing the axion photon conversion, consisting of multiple, consecutive and movable dielectric discs.

Covering this range with a single experimental setup, while simultaneously being able to finetune the resonance on potential signals, necessitates repositioning the experimental hardware continuously and automatically. In simulations the parameter-space (disc positions) can be optimized to produce desired signals. Prominent optimizers are Nelder-Mead or Quasi-Newtonian algorithms.

This talk focuses on the attempt of optimizing a physical, scaled-down MADMAX-like setup in-place based on it’s electrical microwave responses. Challenges are the reduced set of information, the time requirement of the motor movement and the reliability of the algorithm.