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

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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.
Keywords
TOKAMAKS, TORE-SUPRA, REACTORS, ITER, Toroidal/Poloidal Magnetic Fields, ICRF Antennas, ICRF discharge, Tokamaks/Stellarators, Wall Conditioning, ASDEX UPGRADE, PERMANENT MAGNETIC-FIELD

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Citation

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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.
@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},
  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},
}

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