A Single Crystal Niobium RF Cavity of the TESLA Shape
Abstract
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 built. An accelerating gradient of 37.5 MV/m was reached after approximately 110 mu-m of Buffered Chanical Polishing (BCP) and in situ baking at 120°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.
- Authors:
- Publication Date:
- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Org.:
- USDOE - Office of Energy Research (ER)
- OSTI Identifier:
- 914631
- Report Number(s):
- JLAB-ACO-07-709; DOE/ER/40150-4322
TRN: US200812%%203
- DOE Contract Number:
- AC05-84ER40150
- Resource Type:
- Conference
- Resource Relation:
- Conference: Single Crystal Niobium Technology Workship, Araxá, Brazil, October 30-November 1, 2006
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 08 HYDROGEN; ANNEALING; BAKING; CAVITIES; CHEMICAL POLISHING; ELECTRON BEAM WELDING; FABRICATION; GRAIN BOUNDARIES; HYDROGEN; MONOCRYSTALS; NIOBIUM; QUALITY FACTOR; SHAPE; STRESS RELAXATION; WELDING
Citation Formats
Singer, W, Singer, X, and Kneisel, P. A Single Crystal Niobium RF Cavity of the TESLA Shape. United States: N. p., 2007.
Web.
Singer, W, Singer, X, & Kneisel, P. A Single Crystal Niobium RF Cavity of the TESLA Shape. United States.
Singer, W, Singer, X, and Kneisel, P. 2007.
"A Single Crystal Niobium RF Cavity of the TESLA Shape". United States. https://www.osti.gov/servlets/purl/914631.
@article{osti_914631,
title = {A Single Crystal Niobium RF Cavity of the TESLA Shape},
author = {Singer, W and Singer, X and Kneisel, P},
abstractNote = {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 built. An accelerating gradient of 37.5 MV/m was reached after approximately 110 mu-m of Buffered Chanical Polishing (BCP) and in situ baking at 120°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.},
doi = {},
url = {https://www.osti.gov/biblio/914631},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Sep 01 00:00:00 EDT 2007},
month = {Sat Sep 01 00:00:00 EDT 2007}
}