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Hydrogen minority ion cyclotron resonance heating in presence of the iter-like wall in jet

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Abstract
The most recent JET campaign has focused on characterizing operation with the "ITER-like" wall. One of the questions that needed to be answered is whether the auxiliary heating methods do not lead to unacceptably high levels of impurity influx, preventing fusion-relevant operation. In view of its high single pass absorption, hydrogen minority fundamental cyclotron heating in a deuterium plasma was chosen as the reference wave heating scheme in the ion cyclotron domain of frequencies. The present paper discusses the plasma behavior as a function of the minority concentration X[H] in L-mode with up to 4MW of RF power. It was found that the tungsten concentration decreases by a factor of 4 when the minority concentration is increased from X[H] ≈ 5% to X[H] % 20% and that it remains at a similar level when X[H] is further increased to 30%; a monotonic decrease in Beryllium emission is simultaneously observed. The radiated power drops by a factor of 2 and reaches a minimum at X[H] ≈ 20%. It is discussed that poor single pass absorption at too high minority concentrations ultimately tailors the avoidance of the RF induced impurity influx. The edge density being different for different minority concentrations, it is argued that the impact ICRH has on the fate of heavy ions is not only a result of core (wave and transport) physics but also of edge dynamics and fueling.

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Chicago
Van Eester, D, E Lerche, P Jacquet, V Bobkov, A Czarnecka, JW Coenen, L Colas, et al. 2014. “Hydrogen Minority Ion Cyclotron Resonance Heating in Presence of the Iter-like Wall in Jet.” In Radiofrequency Power in Plasmas. Vol. 1580. AIP Publishing.
APA
Van Eester, D, Lerche, E., Jacquet, P., Bobkov, V., Czarnecka, A., Coenen, J., Colas, L., et al. (2014). Hydrogen minority ion cyclotron resonance heating in presence of the iter-like wall in jet. RADIOFREQUENCY POWER IN PLASMAS (Vol. 1580). Presented at the 20th Topical Conference on Radio Frequency Power in Plasmas, AIP Publishing.
Vancouver
1.
Van Eester D, Lerche E, Jacquet P, Bobkov V, Czarnecka A, Coenen J, et al. Hydrogen minority ion cyclotron resonance heating in presence of the iter-like wall in jet. RADIOFREQUENCY POWER IN PLASMAS. AIP Publishing; 2014.
MLA
Van Eester, D, E Lerche, P Jacquet, et al. “Hydrogen Minority Ion Cyclotron Resonance Heating in Presence of the Iter-like Wall in Jet.” Radiofrequency Power in Plasmas. Vol. 1580. AIP Publishing, 2014. Print.
@inproceedings{4147739,
  abstract     = {The most recent JET campaign has focused on characterizing operation with the {\textacutedbl}ITER-like{\textacutedbl} wall. One of the questions that needed to be answered is whether the auxiliary heating methods do not lead to unacceptably high levels of impurity influx, preventing fusion-relevant operation. In view of its high single pass absorption, hydrogen minority fundamental cyclotron heating in a deuterium plasma was chosen as the reference wave heating scheme in the ion cyclotron domain of frequencies. The present paper discusses the plasma behavior as a function of the minority concentration X[H] in L-mode with up to 4MW of RF power. It was found that the tungsten concentration decreases by a factor of 4 when the minority concentration is increased from X[H] \ensuremath{\asymp} 5\% to X[H] \% 20\% and that it remains at a similar level when X[H] is further increased to 30\%; a monotonic decrease in Beryllium emission is simultaneously observed. The radiated power drops by a factor of 2 and reaches a minimum at X[H] \ensuremath{\asymp} 20\%. It is discussed that poor single pass absorption at too high minority concentrations ultimately tailors the avoidance of the RF induced impurity influx. The edge density being different for different minority concentrations, it is argued that the impact ICRH has on the fate of heavy ions is not only a result of core (wave and transport) physics but also of edge dynamics and fueling.},
  articleno    = {223},
  author       = {Van Eester, D and Lerche, E and Jacquet, P and Bobkov, V and Czarnecka, A and Coenen, JW and Colas, L and Cromb{\'e}, Kristel and Graham, M and Jachmich, S and Joffrin, E and Klepper, CC and Marcotte, F and Mayoral, M-L and Monakhov, I and Nave, MFF and Ongena, J and P{\"u}tterich, T and Rimini, F and van Rooij, G},
  booktitle    = {RADIOFREQUENCY POWER IN PLASMAS},
  issn         = {0094-243X},
  language     = {eng},
  location     = {Sorrento, Italy},
  pages        = {4},
  publisher    = {AIP Publishing},
  title        = {Hydrogen minority ion cyclotron resonance heating in presence of the iter-like wall in jet},
  url          = {http://dx.doi.org/10.1063/1.4864528},
  volume       = {1580},
  year         = {2014},
}