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Title: Surface studies of plasma processed Nb samples

Contaminants present at top surface of superconducting radio frequency (SRF) cavities can act as field emitters and restrict the cavity accelerating gradient. A room temperature in-situ plasma processing technology for SRF cavities aiming to clean hydrocarbons from inner surface of cavities has been recently developed at the Spallation Neutron Source (SNS). Surface studies of the plasma-processed Nb samples by Secondary ion mass spectrometry (SIMS) and Scanning Kelvin Probe (SKP) showed that the NeO2 plasma processing is very effective to remove carbonaceous contaminants from top surface and improves the surface work function by 0.5 to 1.0 eV.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Publication Date:
OSTI Identifier:
1225430
DOE Contract Number:
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: SRF 2015, Whistler, BC (Canada), 14-18 Sep 2015
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; NIOBIUM; PLASMA; SUPERCONDUCTING CAVITY RESONATORS; TEMPERATURE RANGE 0273-0400 K; WORK FUNCTIONS; HYDROCARBONS; SURFACE CLEANING; NEON OXIDES Plasma processing; Surface Sience; SRF cavities