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SRF2003 Show Abstract

Title Low temperature heat treatment effect on high-field EP cavities
Type Poster high gradient
Abstract It is well known that low temperature (100-150)C heat treatment (bake) has positive effects on the performance of high field EP cavities. More than 40 test results are analyzed based on single-cell cavity experiments of the CERN-Saclay-DESY collaboration and nine-cell cavities at DESY. The average gradient Eacc,max  increased from 31.9 MV/m to 35.4 MV/m after baking. No dependency of Eacc,max and the gain of Eacc,max on the baking temperature is observed. The Q-value at maximum gradient Q0(Eacc,max) depends significantly on the bake temperature. The average Q0(Eacc,max)s are 5.3E9, 9.2E9 and 7.7E9 at bake temperate (100-110)C, (120-130)C and (130-140)C, respectively. Comparison of BCP and EP cavities shows that at least 60-80 um EP on a BCP surface is necessary. More than 10-15 um removal of the surface by BCP will reduce the performance of an EP cavity.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Hao J. DESY/Peking University
Reschke D. DESY
Brinkmann A. DESY
Lilje L. DESY

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