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ICRF wall conditioning: present status and developments for future superconducting fusion machines

A Lyssoivan, R Koch, Jean-Marie Noterdaeme UGent, V Philipps, D Van Eester, M Vervier, V Rohde, V Bobkov, G Sergienko and E de la Cal, et al. (2009) AIP Conference Proceedings. In AIP Conference Proceedings 1187. p.165-172
abstract
ITER and future superconducting fusion machines need efficient wall conditioning techniques for routine operation in between shots in the presence of permanent high magnetic field for wall cleaning, surface isotope exchange and to control the in-vessel long term tritium retention. Ion Cyclotron Wall Conditioning (ICWC) based on the ICRF discharge is fully compatible and needs the presence of the magnetic field. The present paper focuses on the principal aspects of the ICWC discharge performance in large-size fusion machines: (i) neutral gas RF breakdown with conventional ICRF heating antennas, (ii) antenna coupling with low density (similar to 10(17) m(-3)) RF plasmas and (iii) ICWC scenarios with improved RF plasma homogeneity in the radial and poloidal directions. All these factors were identified as crucial to achieve an enhanced conditioning effect (e.g. removal rates of selected "marker" masses). All the observed effects are analyzed in terms of RF plasma wave excitation/absorption and compared with the predictions from I-D RF full wave and 0-D RF plasma codes. Numerical modeling and empirical extrapolation from the existing machines give good evidence for the feasibility of using ICWC in ITER with the main ICRF antenna.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
TOKAMAKS, TORE-SUPRA, REACTORS, ITER, Toroidal/Poloidal Magnetic Fields, ICRF Antennas, ICRF discharge, Tokamaks/Stellarators, Wall Conditioning, ASDEX UPGRADE, PERMANENT MAGNETIC-FIELD
in
AIP Conference Proceedings
AIP Conf. Proc.
editor
V Bobkov and Jean-Marie Noterdaeme UGent
series title
AIP Conference Proceedings
volume
1187
issue title
Radio frequency power in plasmas
pages
165 - 172
publisher
American Institute of Physics (AIP)
place of publication
Melville, NY, USA
conference name
18th Topical conference on Radio Frequence Power in Plasmas
conference location
Ghent, Belgium
conference start
2009-06-24
conference end
2009-06-26
Web of Science type
Proceedings Paper
Web of Science id
000276069400030
ISSN
0094-243X
ISBN
9780735407534
DOI
10.1063/1.3273720
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1262822
handle
http://hdl.handle.net/1854/LU-1262822
date created
2011-06-15 10:47:44
date last changed
2011-06-16 10:45:16
@inproceedings{1262822,
  abstract     = {ITER and future superconducting fusion machines need efficient wall conditioning techniques for routine operation in between shots in the presence of permanent high magnetic field for wall cleaning, surface isotope exchange and to control the in-vessel long term tritium retention. Ion Cyclotron Wall Conditioning (ICWC) based on the ICRF discharge is fully compatible and needs the presence of the magnetic field. The present paper focuses on the principal aspects of the ICWC discharge performance in large-size fusion machines: (i) neutral gas RF breakdown with conventional ICRF heating antennas, (ii) antenna coupling with low density (similar to 10(17) m(-3)) RF plasmas and (iii) ICWC scenarios with improved RF plasma homogeneity in the radial and poloidal directions. All these factors were identified as crucial to achieve an enhanced conditioning effect (e.g. removal rates of selected {\textacutedbl}marker{\textacutedbl} masses). All the observed effects are analyzed in terms of RF plasma wave excitation/absorption and compared with the predictions from I-D RF full wave and 0-D RF plasma codes. Numerical modeling and empirical extrapolation from the existing machines give good evidence for the feasibility of using ICWC in ITER with the main ICRF antenna.},
  author       = {Lyssoivan, A and Koch, R and Noterdaeme, Jean-Marie and Philipps, V and Van Eester, D and Vervier, M and Rohde, V and Bobkov, V and Sergienko, G and de la Cal, E and Esser, HG and Gauthier, E and Hartmann, DA and Douai, D and Louche, F and Ashikawa, N and Bae, YD and Beaumont, B and Becoulet, A and Br{\'e}mond, S and Dumont, R and Graham, M and Hu, J and Kwak, JG and Laengner, R and Lamalle, PU and Lerche, E and Marchuk, O and Mayoral, ML and Moiseenko, VE and Monakhov, I and Nightingale, M and Ongena, J and Paul, MK and Pitts, R and Plyusnin, V and Schmitz, O and Sch{\"u}ller, FC and Shimada, M and Unterberg, B and Van Schoor, M and Van Wassenhove, G and Volkov, ED and Wauters, Tom and Weynants, R and Zhao, Y},
  booktitle    = {AIP Conference Proceedings},
  editor       = {Bobkov, V and Noterdaeme, Jean-Marie},
  isbn         = {9780735407534},
  issn         = {0094-243X},
  keyword      = {TOKAMAKS,TORE-SUPRA,REACTORS,ITER,Toroidal/Poloidal Magnetic Fields,ICRF Antennas,ICRF discharge,Tokamaks/Stellarators,Wall Conditioning,ASDEX UPGRADE,PERMANENT MAGNETIC-FIELD},
  language     = {eng},
  location     = {Ghent, Belgium},
  pages        = {165--172},
  publisher    = {American Institute of Physics (AIP)},
  title        = {ICRF wall conditioning: present status and developments for future superconducting fusion machines},
  url          = {http://dx.doi.org/10.1063/1.3273720},
  volume       = {1187},
  year         = {2009},
}

Chicago
Lyssoivan, A, R Koch, Jean-Marie Noterdaeme, V Philipps, D Van Eester, M Vervier, V Rohde, et al. 2009. “ICRF Wall Conditioning: Present Status and Developments for Future Superconducting Fusion Machines.” In AIP Conference Proceedings, ed. V Bobkov and Jean-Marie Noterdaeme, 1187:165–172. Melville, NY, USA: American Institute of Physics (AIP).
APA
Lyssoivan, A., Koch, R., Noterdaeme, J.-M., Philipps, V., Van Eester, D., Vervier, M., Rohde, V., et al. (2009). ICRF wall conditioning: present status and developments for future superconducting fusion machines. In V. Bobkov & J.-M. Noterdaeme (Eds.), AIP Conference Proceedings (Vol. 1187, pp. 165–172). Presented at the 18th Topical conference on Radio Frequence Power in Plasmas, Melville, NY, USA: American Institute of Physics (AIP).
Vancouver
1.
Lyssoivan A, Koch R, Noterdaeme J-M, Philipps V, Van Eester D, Vervier M, et al. ICRF wall conditioning: present status and developments for future superconducting fusion machines. In: Bobkov V, Noterdaeme J-M, editors. AIP Conference Proceedings. Melville, NY, USA: American Institute of Physics (AIP); 2009. p. 165–72.
MLA
Lyssoivan, A, R Koch, Jean-Marie Noterdaeme, et al. “ICRF Wall Conditioning: Present Status and Developments for Future Superconducting Fusion Machines.” AIP Conference Proceedings. Ed. V Bobkov & Jean-Marie Noterdaeme. Vol. 1187. Melville, NY, USA: American Institute of Physics (AIP), 2009. 165–172. Print.