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Experimental investigation of ICRF heating scenarios for ITER's halffield Hydrogen phase performed in JET

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Abstract
Two ICRF heating schemes proposed for the half-field operation phase of ITER in Hydrogen plasmas - fundamental H majority and 2nd harmonic 3He ICRF heating - were recently investigated in the JET tokamak. Although the same magnetic field and RF frequencies (B0=2.65T, f=42MHz and f=52MHz, respectively) were used, the density and particularly the plasma temperature foreseen for the initial phase of ITER could not be matched in JET. Modest heating efficiencies (h<0.4) with typically dominant electron heating were found for both scenarios and strong plasma-wall interaction manifested by large impurity content and high radiation losses was observed. This effect is stronger for the 3He ICRF heating case than for the H majority heating case. It was verified that concentrations as high as X[3He]≈20% are necessary to observe significant ion heating in the 2nd harmonic 3He ICRF heating scheme. ICRF accelerated ions up to 50keV in the fundamental H heating experiments and up to 200keV in the 2nd harmonic 3He ICRF heating experiments were detected with NPA diagnostics. While hints of an increase in the heating efficiency as function of the plasma temperature were observed in the H majority case, the He3 concentration was the main ‘handle’ for enhancing the heating efficiency in the 2nd harmonic 3He heating scenario.

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MLA
Lerche, E, D Van Eester, T Johnson, et al. “Experimental Investigation of ICRF Heating Scenarios for ITER’s Halffield Hydrogen Phase Performed in JET.” Europhysics Conference Abstracts. Vol. 34A. Mulhouse, France: European Physical Society (EPS), 2010. Print.
APA
Lerche, E., Van Eester, D., Johnson, T., Hellsten, T., Ongena, J., Mayoral, M.-L., Frigione, D., et al. (2010). Experimental investigation of ICRF heating scenarios for ITER’s halffield Hydrogen phase performed in JET. EUROPHYSICS CONFERENCE ABSTRACTS (Vol. 34A). Presented at the 37th EPS conference on Plasma Physics, Mulhouse, France: European Physical Society (EPS).
Chicago author-date
Lerche, E, D Van Eester, T Johnson, T Hellsten, J Ongena, M-L Mayoral, D Frigione, et al. 2010. “Experimental Investigation of ICRF Heating Scenarios for ITER’s Halffield Hydrogen Phase Performed in JET.” In Europhysics Conference Abstracts. Vol. 34A. Mulhouse, France: European Physical Society (EPS).
Chicago author-date (all authors)
Lerche, E, D Van Eester, T Johnson, T Hellsten, J Ongena, M-L Mayoral, D Frigione, C Sozzi, G Calabro, M. Lennholm, P Beaumont, T Blackman, D Brennan, A Brett, M Cecconello, I Coffey, A Coyne, Kristel Crombé, A Czarnecka, R Felton, M Gatu, C Giroud, C Hellesen, P Jacquet, V Kiptily, S Knipe, A Krasilnikov, M Maslov, I Monakhov, C Noble, M Nocente, L Pangioni, I Proverbio, M Stamp, W Studholme, M Tardocchi, T Versloot, V Vdovin, A Whitehurst, E Woolridge, and V Zoita. 2010. “Experimental Investigation of ICRF Heating Scenarios for ITER’s Halffield Hydrogen Phase Performed in JET.” In Europhysics Conference Abstracts. Vol. 34A. Mulhouse, France: European Physical Society (EPS).
Vancouver
1.
Lerche E, Van Eester D, Johnson T, Hellsten T, Ongena J, Mayoral M-L, et al. Experimental investigation of ICRF heating scenarios for ITER’s halffield Hydrogen phase performed in JET. EUROPHYSICS CONFERENCE ABSTRACTS. Mulhouse, France: European Physical Society (EPS); 2010.
IEEE
[1]
E. Lerche et al., “Experimental investigation of ICRF heating scenarios for ITER’s halffield Hydrogen phase performed in JET,” in EUROPHYSICS CONFERENCE ABSTRACTS, Dublin, Ireland, 2010, vol. 34A.
@inproceedings{1247849,
  abstract     = {Two ICRF heating schemes proposed for the half-field operation phase of ITER in Hydrogen plasmas - fundamental H majority and 2nd harmonic 3He ICRF heating - were recently investigated in the JET tokamak. Although the same magnetic field and RF frequencies (B0=2.65T, f=42MHz and f=52MHz, respectively) were used, the density and particularly the plasma temperature foreseen for the initial phase of ITER could not be matched in JET. Modest heating efficiencies (h<0.4) with typically dominant electron heating were found for both scenarios and strong plasma-wall interaction manifested by large impurity content and high radiation losses was observed. This effect is stronger for the 3He ICRF heating case than for the H majority heating case. It was verified that concentrations as high as X[3He]≈20% are necessary to observe significant ion heating in the 2nd harmonic 3He ICRF heating scheme. ICRF accelerated ions up to 50keV in the fundamental H heating experiments and up to 200keV in the 2nd harmonic 3He ICRF heating experiments were detected with NPA diagnostics. While hints of an increase in the heating efficiency as function of the plasma temperature were observed in the H majority case, the He3 concentration was the main ‘handle’ for enhancing the heating efficiency in the 2nd harmonic 3He heating scenario.},
  articleno    = {O4.121},
  author       = {Lerche, E and Van Eester, D and Johnson, T and Hellsten, T and Ongena, J and Mayoral, M-L and Frigione, D and Sozzi, C and Calabro, G and Lennholm, M. and Beaumont, P and Blackman, T and Brennan, D and Brett, A and Cecconello, M and Coffey, I and Coyne, A and Crombé, Kristel and Czarnecka, A and Felton, R and Gatu, M and Giroud, C and Hellesen, C and Jacquet, P and Kiptily, V and Knipe, S and Krasilnikov, A and Maslov, M and Monakhov, I and Noble, C and Nocente, M and Pangioni, L and Proverbio, I and Stamp, M and Studholme, W and Tardocchi, M and Versloot, T and Vdovin, V and Whitehurst, A and Woolridge, E and Zoita, V},
  booktitle    = {EUROPHYSICS CONFERENCE ABSTRACTS},
  isbn         = {9782914771627},
  issn         = {0378-2271},
  language     = {eng},
  location     = {Dublin, Ireland},
  pages        = {4},
  publisher    = {European Physical Society (EPS)},
  title        = {Experimental investigation of ICRF heating scenarios for ITER's halffield Hydrogen phase performed in JET},
  url          = {http://www.iop.org/Jet/fulltext/EFDC100615.pdf},
  volume       = {34A},
  year         = {2010},
}