4.4 Article

Thin Film (High Temperature) Superconducting Radiofrequency Cavities for the Search of Axion Dark Matter

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2022.3147741

Keywords

Axion; 2G HTS conductors; quality factor; SRF superconducting radio frequency cavities; superconducting resonators

Funding

  1. European Research Council [ERC-2018-StG-802836]
  2. European Union's Horizon 2020 Research and Innovation Programme [730871]
  3. Spanish Agencia Estatal De Investigacion (AEI) [PID2019-108122GB-C33, FPI BES-2017-079787, FPA-2016-76978-C3-2-P]
  4. Fondo Europeo De Desarrollo Regional (FEDER) [PID2019-108122GB-C33, FPI BES-2017-079787, FPA-2016-76978-C3-2-P]
  5. MICINN [RTI2018-095853-B-C21]
  6. SuMaTe [RTI2018-095853-B-C21]
  7. European Regional Development Fund, Center of Excellence Award Severo Ochoa [CEX2019-000917-S]
  8. CERN [FCCGOV-CC-0208 KE4947/ATS]
  9. Fundacao para a Ciencia e Tecnologia [SFRH/BEST/150601/2020]
  10. Fundação para a Ciência e a Tecnologia [SFRH/BEST/150601/2020] Funding Source: FCT

Ask authors/readers for more resources

The article discusses the axion particle as a candidate for cold dark matter and presents the research on coating cavities with superconducting materials to increase the quality factor in the axion dark matter detection experiment at CERN.
The axion is a hypothetical particle which is a candidate for cold dark matter. Haloscope experiments directly search for these particles in strong magnetic fields with RF cavities as detectors. The Relic Axion Detector Exploratory Setup (RADES) at CERN in particular is searching for axion dark matter in a mass range above 30 mu eV. The figure of merit of our detector depends linearly on the quality factor of the cavity and therefore we are researching the possibility of coating our cavities with different superconducting materials to increase the quality factor. Since the experiment operates in strong magnetic fields of 11 T and more, superconductors with high critical magnetic fields are necessary. Suitable materials for this application are for example REBa2Cu3O7-x, Nb3Sn or NbN. We designed a microwave cavity which resonates at around 9 GHz, with a geometry optimized to facilitate superconducting coating and designed to fit in the bore of available high-field accelerator magnets at CERN. Several prototypes of this cavity were coated with different superconducting materials, employing different coating techniques. These prototypes were characterized in strong magnetic fields at 4.2 K.

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