ECRH-assisted plasma start-up with toroidally inclined launch: Multi-machine comparison and perspectives for ITER

J. Stober, G.L. Jackson, E. Ascasibar, Y.-S. Bae, J. Bucalossi, A. Cappa, T. Casper, M.-H. Cho, Y. Gribov, G. Granucci, K. Hanada, J. Hobirk, A.W. Hyatt, S. Ide, J.-H. Jeong, M. Joung, T. Luce, T. Lunt, W. Namkung, S.-I. ParkP.A. Politzer, J. Schweinzer, A.C.C. Sips

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Abstract

Electron cyclotron resonance heating (ECRH)-assisted plasma breakdown is foreseen with full and half magnetic field in ITER. As reported earlier, the corresponding O1- and X2-schemes have been successfully used to assist pre-ionization and breakdown in present-day devices. This contribution reports on common experiments studying the effect of toroidal inclination of the ECR beam, which is ≥20° in ITER. All devices could demonstrate successful breakdown assistance for this case also, although in some experiments the necessary power was almost a factor of 2 higher compared with perpendicular launch. Differences between the devices with regard to the required power and vertical field are discussed and analysed. In contrast to most of these experiments, ITER will build up loop voltage prior to the formation of the field null due to the strong shielding by the vessel. Possible consequences of this difference are discussed. © 2011 IAEA, Vienna.
Original languageEnglish
Article number083031
Pages (from-to)-
JournalNuclear Fusion
Volume51
Issue number8
DOIs
Publication statusPublished - Aug 2011
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Stober, J., Jackson, G. L., Ascasibar, E., Bae, Y-S., Bucalossi, J., Cappa, A., Casper, T., Cho, M-H., Gribov, Y., Granucci, G., Hanada, K., Hobirk, J., Hyatt, A. W., Ide, S., Jeong, J-H., Joung, M., Luce, T., Lunt, T., Namkung, W., ... Sips, A. C. C. (2011). ECRH-assisted plasma start-up with toroidally inclined launch: Multi-machine comparison and perspectives for ITER. Nuclear Fusion, 51(8), -. [083031]. https://doi.org/10.1088/0029-5515/51/8/083031