Improving the Work Function of Nitrogen-Doped Niobium Surfaces for SRF Cavities by Plasma Processing

Conference · Wed Oct 03 00:00:00 EDT 2018 · J.Phys.Conf.Ser.

DOI:https://doi.org/10.18429/JACoW-IPAC2018-THPAL065· OSTI ID:1481372

Tippey, Kristin ^[1]; Afanador, Ralph ^[1]; Doleans, Marc ^[1]; Kim, Sang-Ho ^[1]; Mammosser, John ^[1]; Martinello, Martina ^[2]; McMahan, Christopher ^[1]

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1. ORNL, Oak Ridge (main)
2. Fermilab

Work function and surface chemistries of SiC-polished, electropolished, and nitrogen-doped niobium coupons were analyzed before and after plasma processing using a neon-oxygen gas mixture. These studies represent an initial enquiry into the feasibility of applying the plasma processing technique designed at ORNL for the Spallation Neutron Source (SNS) to the nitrogen-doped Nb cavities for the Coherent Light Source II (LCLS-II). Work function of all measured samples was increased after plasma processing, which indicates the strong potential of the plasma processing technique as a tool for increasing the accelerating gradient of nitrogen-doped cavities.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1481372
• Report Number(s): FERMILAB-CONF-18-482-TD; 1689775
• Journal Information: J.Phys.Conf.Ser., Vol. 1067, Issue 8; Conference: 9th International Particle Accelerator Conference, Vancouver, BC Canada, 04/29-05/04/2018
• Country of Publication: United States
• Language: English

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