2011 Particle Accelerator Conference - List of Authors (Doleans, M.)

Paper

Title

Page

R&D Status for In-Situ Plasma Surface Cleaning of SRF Cavities at Spallation Neutron Source

2124

S.-H. Kim, M.T. Crofford
ORNL, Oak Ridge, Tennessee, USA
M. Doleans
NSCL, East Lansing, Michigan, USA
J.D. Mammosser
JLAB, Newport News, Virginia, USA
J. Saunders
ORNL RAD, Oak Ridge, Tennessee, USA

Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE.
The SNS SCL is reliably operating at 0.93 GeV output energy with an energy reserve of 10MeV with high availability. Most of the cavities exhibit field emission, which directly or indirectly (through heating of end groups) limits the gradients achievable in the high beta cavities in normal operation with the beam. One of the field emission sources would be surface contaminations during surface processing for which mild surface cleaning, if any, will help in reducing field emission. An R&D effort is in progress to develop in-situ surface processing for the cryomodules in the tunnel without disassembly. As the first attempt, in-situ plasma processing has been applied to the CM12 in the SNS SRF facility after the repair work with a promising result. This paper will report the R&D status of plasma processing in the SNS.

Slides THOCS3 [3.294 MB]

Paper	Title	Page
THOCS3	R&D Status for In-Situ Plasma Surface Cleaning of SRF Cavities at Spallation Neutron Source	2124
	S.-H. Kim, M.T. Crofford ORNL, Oak Ridge, Tennessee, USA M. Doleans NSCL, East Lansing, Michigan, USA J.D. Mammosser JLAB, Newport News, Virginia, USA J. Saunders ORNL RAD, Oak Ridge, Tennessee, USA
	Funding: This work was supported by SNS through UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. DOE. The SNS SCL is reliably operating at 0.93 GeV output energy with an energy reserve of 10MeV with high availability. Most of the cavities exhibit field emission, which directly or indirectly (through heating of end groups) limits the gradients achievable in the high beta cavities in normal operation with the beam. One of the field emission sources would be surface contaminations during surface processing for which mild surface cleaning, if any, will help in reducing field emission. An R&D effort is in progress to develop in-situ surface processing for the cryomodules in the tunnel without disassembly. As the first attempt, in-situ plasma processing has been applied to the CM12 in the SNS SRF facility after the repair work with a promising result. This paper will report the R&D status of plasma processing in the SNS.
	Slides THOCS3 [3.294 MB]