Author: Crofford, M.T.
Paper Title Page
TUPB093 Initial Commissioning Experience with the Spallation Neutron Source Vertical Test Area RF System 819
 
  • M.T. Crofford, J.A. Ball, M. Doleans, S.-H. Kim, S.W. Lee, J.D. Mammosser, J. Saunders
    ORNL, Oak Ridge, Tennessee, USA
  • T.L. Davidson, S. Whaley
    ORNL RAD, Oak Ridge, Tennessee, USA
 
  Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
The Spallation Neutron Source (SNS) has developed a vertical test area (VTA) for the testing and qualification of superconducting radio frequency cavities. The associated RF System successfully supported the initial commissioning of the VTA system and has been utilized for cavity testing at both 4 and 2 K. As operational experience was gained, improvements to the RF system were implemented to better utilize the dynamic range of the system, and software updates and additions were made to meet the operational needs. The system continues to evolve as we gain better understanding of the testing needs.
 
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THBA01
Plasma Processing to Improve SRF Accelerating Gradient  
 
  • M. Doleans, R. Afanador, J.A. Ball, D.L. Barnhart, W. Blokland, M.T. Crofford, B. DeGraff, B.S. Hannah, M.P. Howell, S.-H. Kim, S.W. Lee, J.D. Mammosser, C.J. McMahan, T.S. Neustadt, J. Saunders, S.E. Stewart, W.H. Strong, P.V. Tyagi, D.M. Vandygriff
    ORNL, Oak Ridge, Tennessee, USA
 
  Funding: This work is supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE
A new In-situ plasma processing technique is being developed at the SNS (Spallation Neutron Source) to improve the performance of the cavities in operation. The technique utilizes a reactive low-density room-temperature plasma to remove top-surface hydrocarbons. This increases the work function of the cavity surface and reduces the overall amount of electron activity; In particular it increases the field-emission onset, which enables to operate a cavity at higher accelerating gradient. Development of the basic plasma processing parameters and effect on the Niobium surface can be found elsewhere *,**. Details on the results for in-situ plasma processing of dressed cavities in the SNS HTA (horizontal test apparatus) will be reported here.
* M. Doleans et al. “Plasma processing R&D for the SNS superconducting linac RF cavities” SRF2013 Proceedings
** P. V. Tyagi, et al. “Surface Studies of Plasma Processed Nb samples” These proceedings
 
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