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A new system maps superconducting RF cavities using temperature and magnetic fields. This enables detailed studies of superconducting properties and phenomena like quenches.

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Area of Science:

  • Applied Physics
  • Materials Science
  • Superconductivity

Background:

  • Superconducting Radio Frequency (SRF) cavities are crucial for particle accelerators.
  • Understanding dynamic effects impacting superconducting properties is essential for cavity performance.
  • Current mapping techniques often lack integrated magnetic field measurements.

Purpose of the Study:

  • To present a scalable mapping system for SRF cavities.
  • To integrate local temperature measurement with 3D magnetic field mapping.
  • To enable detailed studies of phenomena affecting superconducting properties.

Main Methods:

  • Developed a system combining temperature sensors and anisotropic magnetoresistance-based magnetic field sensors.
  • Implemented a data acquisition rate of 500 Hz for simultaneous channel mapping.
  • Tested the system on a 1.3 GHz TESLA-type SRF cavity.

Main Results:

  • Achieved a magnetic field resolution of 17 nT.
  • Demonstrated the system's scalability to different cavity types.
  • Presented successful combined temperature and magnetic-field maps.
  • Showed anisotropic magnetoresistance sensors perform well in cryogenic environments.

Conclusions:

  • The integrated mapping system provides new capabilities for SRF cavity research.
  • It allows for detailed studies of trapped magnetic flux and its impact on surface resistance.
  • The system facilitates observation of dynamic effects like phase transitions and quenches.