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Title: Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities

Abstract

In this study, an in-situ plasma processing technique has been developed at the Spallation Neutron Source (SNS) to improve the performance of the superconducting radio-frequency (SRF) cavities in operation. The technique uses a low-density reactive neon-oxygen plasma at room-temperature to improve the surface work function, to help remove adsorbed gases on the RF surface and to reduce its secondary emission yield. SNS SRF cavities are six-cell elliptical cavities and the plasma typically ignites in the cell where the electric field is the highest. This article will detail a technique that was developed to ignite and monitor the plasma in each cell of the SNS cavities.

Authors:
ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1338535
Alternate Identifier(s):
OSTI ID: 1337589
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 120; Journal Issue: 24; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Plasma processes; Radiofrequency discharges; Superconductivity; Particle accelerators

Citation Formats

Doleans, Marc. Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities. United States: N. p., 2016. Web. doi:10.1063/1.4972838.
Doleans, Marc. Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities. United States. https://doi.org/10.1063/1.4972838
Doleans, Marc. Tue . "Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities". United States. https://doi.org/10.1063/1.4972838. https://www.osti.gov/servlets/purl/1338535.
@article{osti_1338535,
title = {Ignition and monitoring technique for plasma processing of multicell superconducting radio-frequency cavities},
author = {Doleans, Marc},
abstractNote = {In this study, an in-situ plasma processing technique has been developed at the Spallation Neutron Source (SNS) to improve the performance of the superconducting radio-frequency (SRF) cavities in operation. The technique uses a low-density reactive neon-oxygen plasma at room-temperature to improve the surface work function, to help remove adsorbed gases on the RF surface and to reduce its secondary emission yield. SNS SRF cavities are six-cell elliptical cavities and the plasma typically ignites in the cell where the electric field is the highest. This article will detail a technique that was developed to ignite and monitor the plasma in each cell of the SNS cavities.},
doi = {10.1063/1.4972838},
journal = {Journal of Applied Physics},
number = 24,
volume = 120,
place = {United States},
year = {Tue Dec 27 00:00:00 EST 2016},
month = {Tue Dec 27 00:00:00 EST 2016}
}

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Cited by: 6 works
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Works referenced in this record:

In-situ plasma processing to increase the accelerating gradients of superconducting radio-frequency cavities
journal, March 2016

  • Doleans, M.; Tyagi, P. V.; Afanador, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 812
  • DOI: 10.1016/j.nima.2015.12.043

Improving the work function of the niobium surface of SRF cavities by plasma processing
journal, April 2016


The Spallation Neutron Source accelerator system design
journal, November 2014

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Status of the SNS Superconducting Linac and Future Plan
journal, March 2008

  • Kim, Sang-Ho
  • Journal of the Korean Physical Society, Vol. 52, Issue 9(3)
  • DOI: 10.3938/jkps.52.714

Works referencing / citing this record:

Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities
journal, July 2019

  • Berrutti, P.; Giaccone, B.; Martinello, M.
  • Journal of Applied Physics, Vol. 126, Issue 2
  • DOI: 10.1063/1.5092235