Document Type

Conference Paper

Publication Date




Publication Title

Proceedings, 8th International Particle Accelerator Conference (IPAC 2017)



Conference Name

8th International Particle Accelerator Conference (IPAC 2017), Copenhagen, Denmark, May 14-19, 2017


The final steps in the manufacturing of a superconducting RF cavity involve careful tuning before the final welds to match the target frequency as fabrication tolerances may introduce some frequency deviations. The target frequency is chosen based on analysis of the shifts induced by remaining processing steps including acid etching and cool down. The baseline fabrication of a DQW crab cavity for the High Luminosity LHC (HL-LHC) envisages a first tuning before the cavity subassemblies are welded together. To produce a very accurate final result, subassemblies are trimmed to frequency in the last machining steps, using a clamped cavity assembly for RF measurements. This paper will describe the trim tuning of one of the SPS prototype DQW crab cavities fabricated by Niowave.


Copyright © 2017 by JACoW, Geneva, Switzerland.

Published under a Creative Commons Attribution 3.0 unported license.

Work partially supported by US Department of Energy via BSA LLC contract No. DE-AC02-98CH10886 and by the US LARP program.

Original Publication Citation

Verdu-Andres, S., Skaritka, J., Wu, Q., Ratti, A., Baurac, S., Boulware, C., . . . Park, H. (2017). Trim tuning of a SPS-series DQW crab cavity prototypes. Paper presented at the 8th International Particle Accelerator Conference, Copenhagen, Denmark.