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Nb3Sn multicell cavity coating system at Jefferson Lab.

G Eremeev1, W Clemens1, K Macha1

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The Review of Scientific Instruments
|August 6, 2020
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Summary
This summary is machine-generated.

Researchers developed a new niobium-tin (Nb3Sn) coating system for superconducting radio frequency niobium cavities. This advancement aims to improve accelerator performance for scientific discovery and industrial applications.

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Area of Science:

  • Materials Science
  • Accelerator Physics
  • Superconductivity

Background:

  • Superconducting radio frequency niobium cavities are crucial for modern particle accelerators.
  • Enhancing cavity performance (lower resistance, higher fields, higher temperatures) is key for future scientific and industrial applications.

Purpose of the Study:

  • To design and evaluate a novel coating system for creating niobium-tin (Nb3Sn) films on the inner surfaces of niobium cavities.
  • To assess the impact of Nb3Sn coatings on the radio frequency properties of accelerator cavities.

Main Methods:

  • A niobium retort was used to heat niobium cavities via radiation.
  • The niobium surface was exposed to tin (Sn) and tin(II) chloride (SnCl2) vapor during a heat cycle to form a ~2 μm Nb3Sn film.
  • Characterization of film composition, structure, and radio frequency performance.

Main Results:

  • Successful fabrication of a ~2 μm thick Nb3Sn film on the inner surface of niobium cavities.
  • Demonstrated the feasibility of the coating system for both research and development (R&D) and practical accelerator cavities.
  • Radio frequency properties of coated cavities were evaluated.

Conclusions:

  • The developed Nb3Sn coating system offers a promising method for enhancing superconducting radio frequency cavities.
  • This technology could lead to improved performance in scientific accelerators and cost-effective industrial solutions.