A Single Crystal Niobium RF Cavity of the TESLA Shape
- DESY, Notkestrasse 85, D-22607 Hamburg (Germany)
A fabrication method for single crystal niobium cavities of the TESLA shape was proposed on the basis of metallographic investigations and electron beam welding tests on niobium single crystals. These tests showed that a cavity can be produced without grain boundaries even in the welding area. An appropriate annealing allows the outgassing of hydrogen and stress relaxation of the material without destruction of the single crystal. A prototype single crystal single cell cavity was build. An accelerating gradient of 37.5 MV/m was reached after approximately 110 {mu}m of Buffered Chemical Polishing (BCP) and in situ baking at 120 deg. C for 6 hrs with a quality factor exceeding 2x1010 at 1.8 K. The developed fabrication method can be extended to fabrication of multi cell cavities.
- OSTI ID:
- 21067373
- Journal Information:
- AIP Conference Proceedings, Vol. 927, Issue 1; Conference: International niobium workshop on single crystal - large grain niobium technology, Araxa (Brazil), 30 Oct - 1 Nov 2006; Other Information: DOI: 10.1063/1.2770686; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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