NDLI: Refining and maintaining the optimal performance of the CEBAF SRF systems

Content Provider	IEEE Xplore Digital Library
Author	Reece, C. Benesch, J. Preble, J.
Copyright Year	2001
Description	Author affiliation: Thomas Jefferson Nat. Accelerator Facility, Newport News, VA, USA (Reece, C.)
Abstract	CEBAF at Jefferson Lab is striving to achieve its maximum reliability at the maximum deliverable energy for physics experiments. Most critical are the acceleration systems. Characterizations of the individual limiting characteristics of the 338 superconducting RF (SRF) cavities continue to be refined. The field-emission-stimulated discharges at the cold RF waveguide input windows remain the dominant energy-limiting effect. By refining the cavity-specific dependences of this window arcing, we are able to minimize the resulting lost beam time when CEBAF is run near its maximum energy. Operation at increased RF power levels has produced unanticipated heating in the region near the warm polymeric RF windows on a few cavities. This has stimulated the migration to a more durable ceramic replacement window. During 2000, CEBAF encountered its first cryomodule helium leak into beam vacuum, most likely through an indium wire seal. Characterization of the leak and accommodation methods used will be described. Finally, in situ RF/helium processing of cavities continues to increase the available linac voltage.
Sponsorship	U.S. Dept. Energy
Starting Page	1186
Ending Page	1188
File Size	381045
Page Count	3
File Format	PDF
ISBN	0780371917
DOI	10.1109/PAC.2001.986622
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Helium Maintenance Physics Acceleration Heating Polymers Ceramics Indium Wire
Content Type	Text
Resource Type	Article

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Refining and Maintaining the Optimal Performance of the CEBAF SRF Systems

Refining and Maintaining the Optimal Performance of the CEBAF SRF Systems

Performance of the first refurbished CEBAF cryomodule

Performance of production SRF cavities for CEBAF

Performance experience with the CEBAF SRF cavities

Performance of the LEP2 SRF system

SRF Performance of CEBAF After Thermal Cycle to Ambient Temperature

SRF Performance of CEBAF After Thermal Cycle to Ambient Temperature

Cryogenic testing of the RF input waveguide for the CEBAF upgrade cryomodule

Refining and maintaining the optimal performance of the CEBAF SRF systems

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Cryogenic testing of the RF input waveguide for the CEBAF upgrade cryomodule

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