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Title: Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities

Abstract

Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters and increasing the work function of Nb. A collaboration has been established between Fermi National Accelerator Laboratory (FNAL), SLAC National Accelerator Laboratory and Oak Ridge National Laboratory (ORNL) with the purpose of applying plasma processing to the Linac Coherent Light Source-II (LCLS-II) cavities, in order to minimize and overcome field emission without affecting the high Q of nitrogen-doped cavities. The cleaning for LCLS-II will follow the same plasma composition adopted at SNS, which allows in-situ processing of cavities installed in cryomodules from hydrocarbon contaminants. A novel method for plasma ignition has been developed at FNAL: a plasma glow discharge is ignited using high order modes to overcome limitations imposed by the fundamental power coupler, allowing in-situ cleaning for cavities in cryomodule. The plasma can be easily ignited and tuned in each of the cavity cells using low RF power. A method for plasma detection has been developed as well, which allows the detection of themore » plasma location in the cavity without the need of cameras at both cavity ends. The presented method can be applied to other multi-cell cavity designs, even for accelerators where the coupling for the fundamental modes at room temperature is very weak.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [2];  [3];  [3]; ORCiD logo [3]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1556987
Alternate Identifier(s):
OSTI ID: 1532784
Report Number(s):
[arXiv:1902.03172; FERMILAB-PUB-19-284-TD]
[Journal ID: ISSN 0021-8979; 1719218]
Grant/Contract Number:  
[AC02-07CH11359]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
[ Journal Volume: 126; Journal Issue: 2]; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Berrutti, P., Giaccone, B., Martinello, M., Grassellino, A., Khabiboulline, T., Doleans, M., Kim, S., Gonnella, D., Lanza, G., and Ross, M. Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities. United States: N. p., 2019. Web. doi:10.1063/1.5092235.
Berrutti, P., Giaccone, B., Martinello, M., Grassellino, A., Khabiboulline, T., Doleans, M., Kim, S., Gonnella, D., Lanza, G., & Ross, M. Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities. United States. doi:10.1063/1.5092235.
Berrutti, P., Giaccone, B., Martinello, M., Grassellino, A., Khabiboulline, T., Doleans, M., Kim, S., Gonnella, D., Lanza, G., and Ross, M. Wed . "Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities". United States. doi:10.1063/1.5092235. https://www.osti.gov/servlets/purl/1556987.
@article{osti_1556987,
title = {Plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities},
author = {Berrutti, P. and Giaccone, B. and Martinello, M. and Grassellino, A. and Khabiboulline, T. and Doleans, M. and Kim, S. and Gonnella, D. and Lanza, G. and Ross, M.},
abstractNote = {Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters and increasing the work function of Nb. A collaboration has been established between Fermi National Accelerator Laboratory (FNAL), SLAC National Accelerator Laboratory and Oak Ridge National Laboratory (ORNL) with the purpose of applying plasma processing to the Linac Coherent Light Source-II (LCLS-II) cavities, in order to minimize and overcome field emission without affecting the high Q of nitrogen-doped cavities. The cleaning for LCLS-II will follow the same plasma composition adopted at SNS, which allows in-situ processing of cavities installed in cryomodules from hydrocarbon contaminants. A novel method for plasma ignition has been developed at FNAL: a plasma glow discharge is ignited using high order modes to overcome limitations imposed by the fundamental power coupler, allowing in-situ cleaning for cavities in cryomodule. The plasma can be easily ignited and tuned in each of the cavity cells using low RF power. A method for plasma detection has been developed as well, which allows the detection of the plasma location in the cavity without the need of cameras at both cavity ends. The presented method can be applied to other multi-cell cavity designs, even for accelerators where the coupling for the fundamental modes at room temperature is very weak.},
doi = {10.1063/1.5092235},
journal = {Journal of Applied Physics},
number = [2],
volume = [126],
place = {United States},
year = {2019},
month = {7}
}

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Works referenced in this record:

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