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Title A Pleasant Surprise: Mild Baking Gives Large Improvement for the Q-Slope of a BCP Cavity
Type Poster high gradient
Abstract Previous measurements have shown that mild baking has a significant effect on the high field Q-drop of electropolished cavities. But for BCP (112) cavities, the improvement is not so substantial. Recently we tested a RRR = 500 cavity without high temperature (1350 C) titanium purification, nor 800 C baking. To our surprise a mild baking (110 C, 48 hours) increased the onset field of the Q-slope by 50%. At 1E10 Q the field increased from Eacc = 18 to Eacc 27 MV/m.  At a Q = 2E9 the field improved from Eacc = 24 to 32 MV/m. A light BCP re-established the stronger Q-slope. A second baking at 140 C had little effect on the Q-slope. Results from other cavities  show Q-slope degradation for higher temperature bakes. All tests are accompanied by temperature mapping which show interesting features.

List of authors...

Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Eremeev G. Cornell University
Liepe M. Cornell University
Padamsee H. Cornell University
Roy R. Cornell University

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