REVIEW OF HIGH FIELD Q SLOPE, CAVITY MEASUREMENTS

Conference · Wed Jan 23 00:00:00 EST 2008

OSTI ID:922270

Ciovati, Gianluigi

One of the most interesting phenomenon occurring in superconducting radio-frequency (SRF) cavities made of bulk niobium is represented by a sharp decrease of the quality factor above peak surface magnetic field of about 90 mT and is referred to as "high field Q-slope" or "Q-drop". This phenomenon was observed first in 1997 and since then some effort was devoted to the understanding of the causes behind it. Still, no clear physical interpretation of the Q-drop has emerged, despite several attempts. In this contribution, I will review the experimental results for various cavities measured in many laboratories and I will try to identify common features and differences related to the Q-drop.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 922270
• Report Number(s): JLAB-ACC-07-769; DOE/OR/23177-0289
• Resource Relation: Conference: 13th Workshop on RF Superconductivity, Beijing, China, Oct. 14 - 19, 2007
• Country of Publication: United States
• Language: English