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Title A Review of High-Field Q-Slope Studies at Cornell
Type Poster SRF basics
Abstract The TESLA collaboration has been making steady progress in developing cavity treatment procedures to regularly reach accelerating fields above 25 MV/m. At higher gradients the Q begins to drop precipitously without field emission. New treatments such as electro-polishing and 100 C baking have been developed to delay the onset of the Q-drop to 30 - 40 MV/m.  Missing is a good understanding of the cause of the Q-decline, the reason for the effectiveness of the empirical cures, and whether the cures work on all cavities. Advances in these areas will open the door to higher gradients. This paper will summarize Q-slope studies at Cornell over the last few years. These include tests on cavities prepared by various treatments: standard chemical etching, electro-polishing, and anodizing. DESY has provided some of the cavities, especially those with electro-polished surfaces. Each cavity is tested before and after baking over a range of temperatures, as well as after baking at 800 C. Tests at Cornell include a powerful thermometry diagnostic system which helps identify regions of high RF losses.  Models for the Q-slope and baking effects will also be discussed in the context of the Cornell experiments.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Padamsee H. Cornell University
Barnes P. Cornell University
Bazarov I. Cornell University
Crawford C. Cornell University
Eremeev G. Cornell University
Geng R.L. Cornell University
Knobloch J. Cornell University
Liepe M. Cornell University
Romanenko O. Cornell University
Sears J. Cornell University

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