High-gradient srf R&D for ILC at jefferson lab

R. L. Geng, A. C. Crawford, G. Ciovati, M. S. Champion, D. A. Sergatskov, F. Furuta, K. Saito

Research output: Contribution to conferencePaperpeer-review

Abstract

Jefferson Lab plays an active role in high-gradient SRF R&D in the frame work of the internationally coordinated International Linea Collider (ILC) S0 program. The S0 aim is to push the yield at 35 MV/m in 9-cell cavities. So far, twelve cavities have been electropolishing (EP) processed and RF tested by using the state-of-the-art recipes at JLab, in close collaboration with FNAL and KEK. Seven of them reached a best gradient of over 31.5 MV/m. Understanding gradient limiting mechanisms in real 9-cell cavities is an important component of our studies. Thermometry and high-resolution optical inspection are used to locate and understand the source of gradient limits. Experimenting with selective cavities is still a necessary method for process optimization. One example is the first demonstration of 35 MV/m without detectable Bremsstrahlung X-ray after a light EP is applied to a previously heavy chemical etched 7-cell cavity. Some new understanding has been gained with regard to quench behaviors, field emission behaviors as well as optimized processing. Progress has been made as a result, exemplified by the recent achievement of ≥ 35 MV/m in two cavities, each after the first light EP. Several exploratory studies are under way at JLab, aiming to covert the new understandings into further improved cavity gradient results.

Original languageEnglish
Pages879-881
Number of pages3
StatePublished - 2009
Externally publishedYes
Event24th International Linear Accelerator Conference, LINAC 2008 - Victoria, BC, Canada
Duration: Sep 29 2008Oct 3 2008

Conference

Conference24th International Linear Accelerator Conference, LINAC 2008
Country/TerritoryCanada
CityVictoria, BC
Period09/29/0810/3/08

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