Commissioning results of Nb₃Sn cavity vapor diffusion deposition system at JLab [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 620.19 Other engineering materials
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2015
• Mô tả vật lý: Size: 3 p. : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 268198
• Chủ đề: 1. 36 materials science; 2. 43 particle accelerators; 3. Cebaf accelerator; 4. Niobium base alloys; 5. Tin alloys

Tóm tắt

 Nb<
 sub>
 3<
 /sub>
 Sn as a BCS superconductor with a superconducting critical temperature higher than that of niobium offers potential benefit for SRF cavities via a lower-than-niobium surface resistance at the same temperature and frequency. A Nb<
 sub>
 3<
 /sub>
 Sn vapor diffusion deposition system designed for coating of 1.5 and 1.3 GHz single-cell cavities was built and commissioned at JLab. As the part of the commissioning, RF performance at 2.0 K of a single-cell 1.5 GHz CEBAF-shaped cavity was measured before and after coating in the system. Before Nb<
 sub>
 3<
 /sub>
 Sn coating the cavity had a Q<
 sub>
 0<
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  of about 10<
 sup>
 10<
 /sup>
  and was limited by the high field Q-slope at E<
 sub>
 acc<
 /sub>
  ? 27 MV/m. Coated cavity exhibited the superconducting transition at about 17.9 K. The low-field quality factor was about 5?10<
 sup>
 9<
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  at 4.3 K and 7?10<
 sup>
 9<
 /sup>
  at 2.0 K decreasing with field to about 1?10<
 sup>
 9<
 /sup>
  at E<
 sub>
 acc<
 /sub>
  ? 8 MV/m at both temperatures. The highest field was limited by the available RF power.