Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 80: Axions/ALPs II

T 80.6: Vortrag

Donnerstag, 19. März 2026, 17:30–17:45, KH 02.019

Determining the MADMAX boost factor using the bead pull method — •Lea Stankewitz for the MADMAX collaboration — Institut für Experimentalphysik, Universität Hamburg

The MAgnetised Disk and Mirror Axion eXperiment is a dielectric haloscope which aims to search for dark matter axions between 40 µ eV and 400 µ eV. It converts axions into photons using a strong magnetic field. The conversion probability is enhanced by arranging multiple dielectric disks in a resonant configuration, the so called booster. The boost factor, that quantifies how much the axion signal power is amplified relative to a simple dish-antenna configuration, can be determined from the electric field strength in between the disks. To measure the electric field the bead pull method is used, where a small dielectric object is moved through the setup to measure the electric field at different positions. For the next axion search, which will measure multiple frequency ranges, calibration of multiple disc configurations is required. The bead pull measurements inside the cryostat will have a limited range, therefore good reference measurements are required. In this talk I present the results of the boost factor determination for the open booster setup with a three disks configuration using a high-precision bead pull setup. These measurements will be used to calibrate the system for the first cryogenic axion search with MADMAX in the MORPURGO magnet at CERN.

Keywords: Axion; Bead pull; Dielectric haloscope