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T: Fachverband Teilchenphysik

T 70: Searches for Dark Matter II

T 70.9: Vortrag

Mittwoch, 17. März 2021, 18:00–18:15, Tt

Tuneable (HT)S RADES cavity prototype — •Jessica Golm for the RADES collaboration — European Organization for Nuclear Research (CERN), Geneva , Switzerland — Friedrich Schiller University Jena, Jena, Germany

The RADES (Relic Axion Detector Exploratory Setup) project has the goal of directly searching for axion dark matter above the 30 μeV scale employing custom-made microwave filters in magnetic fields, in particular exploiting existing accelerator dipole magnets. Our existing setup comprises an array of small microwave cavities connected by rectangular irises. The size of the unit cavity determines the main resonant frequency, while connecting a large number of cavities provides a large detection volume. The next step of the project is the development of superconducting cavities which resonate in the range of 8 to 9 GHz and have high quality factors in magnetic fields of up to 14 T. Suitable materials for this applications are high temperature superconductors (HTS) or Nb3Sn. A microwave cavity has been optimized to facilitate superconducting coating which fits in the bore of available high-field accelerator magnets at CERN. Such cavities can be used in multi-tesla magnetic fields and have a higher sensitivity compared to copper coated cavities of the same type. In addition, the new prototype is cut vertically along the electrical field lines which allows a tuning range of 600 MHz by adjusting the separation of the two halves. The present status of this program is described.