Actions for High gradient superconducting niobium cavities [electronic resource] : A review of the present status

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High gradient superconducting niobium cavities [electronic resource] : A review of the present status

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1998.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
1,152 Kilobytes pages : digital, PDF file
Additional Creators
Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Superconducting niobium cavities used in particle accelerators are limited in their rf performance by two phenomena: quench field levels below the theoretical limit of the material caused by defects, and field emission loading resulting from artificial contamination of the superconducting surfaces during surface treatment and assembly procedures. In recent years, the community involved in SRF technology developments has successfully improved cavity performances by applying advanced surface treatment methods such as chemical polishing, electropolishing, tumbling, high temperature heat treatment, high pressure rinsing, ``in situ'' high peak power processing, and clean room assembly procedures. In addition, improvements in the material properties such as thermal conductivity by ''solid state'' gettering'' and very strict QA methods, both in material inspection and during cavity fabrication, have resulted in cavity performance levels of E{sub acc} up to 40 MV/m in monocells and gradients in the vicinity of 30 MV/m in multicell structures at Q-values of ≈ 10¹° at a temperature of 2K. More recently the fabrication of ``seamless'' cavities by spinning is being pursued with encouraging results. This process eliminates electron beam welds, which sometimes are the causes of performance degradations.
Report Numbers
E 1.99:doe/er/40150-1444
E 1.99: jlab-act-98-07
jlab-act-98-07
doe/er/40150-1444
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Note
Published through SciTech Connect.
09/01/1998.
"doe/er/40150-1444"
" jlab-act-98-07"
Conference title not supplied, No location, No date.
Peter Kneisel.
Funding Information
AC05-84ER40150
View MARC record | catkey: 14684611