Performance of Oak Ridge National Laboratory spallation neutron source proton power upgrade cavities and cryomodule production

Journal Article · 10 October 2024 · Physical Review Accelerators and Beams

DOI: https://doi.org/10.1103/PhysRevAccelBeams.27.102001 · OSTI ID:2462837

Dhakal, P. ; Daly, E. F.; Davis, K.; Drury, M. ; Fischer, J.; Forehand, D.; Grabowski, A.; Huque, N.; Kent, J.; Macha, K.; McCaughan, M. ; McEwen, E. A. ; Mitchell, A. ; Owen, P. ; Stirbet, M.; Wilson, K. M. ; Zhao, L. ; Howell, M.; Kim, S.; Mammosser, J. D.

The Proton Power Upgrade initiative at Oak Ridge National Lab’s Spallation Neutron Source aims to greatly boost the capability of proton beam power. This upgrade involves the integration of seven additional cryomodules, each housing four six-cell high-beta ( $\beta =0.81$ ) superconducting radio frequency cavities. These cavities, manufactured and processed by Research Instruments in Germany, underwent meticulous treatment, including electropolishing as the bulk and final vital step. Upon delivery to Jefferson Lab, a total of 28 cavities for seven cryomodules, along with an additional four cavities for a spare cryomodule, underwent thorough vertical qualification tests, meeting the required specifications. Following cavity tanking and subsequent rf testing, the assembly of eight cryomodules was successfully executed, with all 32 cavities demonstrating compliance with acceptance criteria. The transportation of the cryomodule to SNS for high-power testing in the tunnel yielded exceptional results. Notably, the performance surpassed specifications, in terms of quality factor and accelerating gradient. Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• Grant/Contract Number: AC05-06OR23177
• OSTI ID: 2462837
• Journal Information: Physical Review Accelerators and Beams, Journal Name: Physical Review Accelerators and Beams Journal Issue: 10 Vol. 27; ISSN 2469-9888; ISSN PRABCJ
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English