In-situ plasma processing to increase the accelerating gradients of SRF cavities

Doleans, Marc; Afanador, Ralph; Barnhart, Debra L.; Degraff, Brian D.; Gold, Steven W.; Hannah, Brian S.; Howell, Matthew P.; Kim, Sang-Ho; Mammosser, John; McMahan, Christopher J.; Neustadt, Thomas S.; Saunders, Jeffrey W.; Tyagi, Puneet V.; Vandygriff, Daniel J.; Vandygriff, David M.; Ball, Jeffrey Allen; Blokland, Willem; Crofford, Mark T.; Lee, Sung-Woo; Stewart, Stephen; Strong, William Herb

doi:10.1016/j.nima.2015.12.043

Title: In-situ plasma processing to increase the accelerating gradients of SRF cavities

Journal Article · 31 December 2015 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2015.12.043 · OSTI ID:1234337

Doleans, Marc ^[1]; Afanador, Ralph ^[1]; Barnhart, Debra L. ^[1]; Degraff, Brian D. ^[1]; Gold, Steven W. ^[1]; Hannah, Brian S. ^[1]; Howell, Matthew P. ^[1]; Kim, Sang-Ho ^[1]; Mammosser, John ^[1]; McMahan, Christopher J. ^[1]; Neustadt, Thomas S. ^[1]; Saunders, Jeffrey W. ^[1]; Tyagi, Puneet V. ^[1]; Vandygriff, Daniel J. ^[1]; Vandygriff, David M. ^[1]; Ball, Jeffrey Allen ^[1]; Blokland, Willem ^[1]; Crofford, Mark T. ^[1]; Lee, Sung-Woo ^[1]; Stewart, Stephen ^[1] more »

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

A new in-situ plasma processing technique is being developed at the Spallation Neutron Source (SNS) to improve the performance of the cavities in operation. The technique utilizes a low-density reactive oxygen plasma at room temperature to remove top surface hydrocarbons. The plasma processing technique increases the work function of the cavity surface and reduces the overall amount of vacuum and electron activity during cavity operation; in particular it increases the field emission onset, which enables cavity operation at higher accelerating gradients. Experimental evidence also suggests that the SEY of the Nb surface decreases after plasma processing which helps mitigating multipacting issues. This article discusses the main developments and results from the plasma processing R&D are presented and experimental results for in-situ plasma processing of dressed cavities in the SNS horizontal test apparatus.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1234337

Alternate ID(s):: OSTI ID: 1251772

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 812; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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