SMuK 2023 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Fundamental Symmetries I

HK 33.2: Group Report

Wednesday, March 22, 2023, 14:30–15:00, SCH/A252

Degaussing of a Magnetically Shielded Room for the ³He-¹²⁹Xe Comagnetometer Experiment in Heidelberg — •Benjamin Brauneis¹, Fabian Allmendinger¹, Werner Heil², and Ulrich Schmidt¹ — ¹Physikalisches Institut, Universität Heidelberg — ²Institut für Physik, Universität Mainz

The permanent Electric Dipole Moment (EDM) of ¹²⁹Xenon is an experimentally accessible signal for potential sources of CP-violation not described by the Standard Model. It can be measured in a clock comparison experiment using a gas mixture of free spin precessing nuclear polarized ³He and ¹²⁹Xe. To reach the desired accuracy this experiment has to be performed at low frequencies (few Hz) and therefore within a Magnetically Shielded Room (MSR). Furthermore, very small field gradients (pT per cm) are required in order to reach a sufficiently large spin coherence time. Our MSR consisting of three layers of Mu-metal and one layer of copper-plated aluminum was constructed in Heidelberg 2021. Efforts are made to develop an advanced degaussing routine yielding to reproducible low residual magnetic fields within the MSR. We report on the current status of preparation for next Xe-EDM measurements in Heidelberg with special focus on the degaussing procedure and the performance for our MSR.