Design and performance of a new induction furnace for heat treatment of superconducting radiofrequency niobium cavities [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Science, 2012. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- 065,105-065,110 : digital, PDF file
- Additional Creators:
- Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Superconducting radio frequency (SRF) cavities made of high purity niobium (Nb) are the building blocks of many modern particle accelerators. The fabrication process includes several cycles of chemical and heat treatment at low (≈120 deg C) and high (≈800 deg C) temperatures. In this contribution, we describe the design and performance of an ultra-high-vacuum furnace which uses an induction heating system to heat treat SRF cavities. Cavities are heated by radiation from the Nb susceptor. By using an all-niobium hot zone, contamination of the Nb cavity by foreign elements during heat treatment is minimized and allows avoiding subsequent chemical etching. The furnace was operated up to 1400 deg C with a maximum pressure of ≈1 x 10⁻⁵ Torr and the maximum achievable temperature is estimated to be higher than 2000 deg C. Initial results on the performance of a single cell 1.5 GHz cavity made of ingot Nb heat treated at 1200 deg C using this new induction furnace and without subsequent chemical etching showed a reduction of the RF losses by a factor of ≈2 compared to cavities made of fine-grain Nb which underwent standard chemical and heat treatments.
- Published through SciTech Connect., 06/01/2012., "jlab-acc-12-1554", " doe/or/23177-2198", Review of Scientific Instruments 83 6 ISSN 0034-6748; RSINAK, and Pashupati Dhakal, Gianluigi Ciovati, Way.
- Funding Information:
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