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Experimental invest...
Experimental investigation of ion cyclotron range of frequencies heating scenarios for ITER's half-field hydrogen phase performed in JET
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Lerche, E. (author)
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Van Eester, D. (author)
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- Johnson, Thomas Joe (author)
- KTH,Fusionsplasmafysik
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- Hellsten, Torbjörn (author)
- KTH,Fusionsplasmafysik
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Ongena, J. (author)
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Mayoral, M-L (author)
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Frigione, D. (author)
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Sozzi, C. (author)
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Calabro, G. (author)
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Lennholm, M. (author)
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Beaumont, P. (author)
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Blackman, T. (author)
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Brennan, D. (author)
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Brett, A. (author)
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- Cecconello, Marco (author)
- Uppsala universitet,Tillämpad kärnfysik
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Coffey, I. (author)
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Coyne, A. (author)
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Crombe, K. (author)
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Czarnecka, A. (author)
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Felton, R. (author)
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Giroud, C. (author)
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Gorini, G. (author)
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- Hellesen, Carl (author)
- Uppsala universitet,Tillämpad kärnfysik
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Jacquet, P. (author)
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Kiptily, V. (author)
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Knipe, S. (author)
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Krasilnikov, A. (author)
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Maslov, M. (author)
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Monakhov, I. (author)
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Noble, C. (author)
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Nocente, M. (author)
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Pangioni, L. (author)
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Proverbio, I. (author)
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Sergienko, G. (author)
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Stamp, M. (author)
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Studholme, W. (author)
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Tardocchi, M. (author)
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Vdovin, V. (author)
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Versloot, T. (author)
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Voitsekhovitch, I. (author)
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Whitehurst, A. (author)
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Wooldridge, E. (author)
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Zoita, V. (author)
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(creator_code:org_t)
- 2012-06-22
- 2012
- English.
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In: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 0741-3335 .- 1361-6587. ; 54:7, s. 074008-
- Related links:
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https://biblio.ugent...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Two ion cyclotron range of frequencies ( ICRF) heating schemes proposed for the half-field operation phase of ITER in hydrogen plasmas-fundamental H majority and second harmonic He-3 ICRF heating-were recently investigated in JET. Although the same magnetic field and RF frequencies (f approximate to 42 MHz and f approximate to 52 MHz, respectively) were used, the density and particularly the plasma temperature were lower than those expected in the initial phase of ITER. Unlike for the well-performing H minority heating scheme to be used in He-4 plasmas, modest heating efficiencies (n = P-absorbed/P-launched < 40%) with dominant electron heating were found in both H plasma scenarios studied, and enhanced plasma-wall interaction manifested by high radiation losses and relatively large impurity content in the plasma was observed. This effect was stronger in the He-3 ICRF heating case than in the H majority heating experiments and it was verified that concentrations as high as similar to 20% are necessary to observe significant ion heating in this case. The RF acceleration of the heated ions was modest in both cases, although a small fraction of the 3He ions reached about 260 keV in the second harmonic He-3 heating experiments when 5MW of ICRF power was applied. Considerable RF acceleration of deuterium beam ions was also observed in some discharges of the He-3 heating experiments (where both the second and third harmonic ion cyclotron resonance layers of the D ions are inside the plasma) whilst it was practically absent in the majority hydrogen heating scenario. While hints of improved RF heating efficiency as a function of the plasma temperature and plasma dilution (with He-4) were confirmed in the H majority case, the He-3 concentration was the main handle on the heating efficiency in the second harmonic He-3 heating scenario.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Dt Plasmas
- Spectroscopy
- Tokamak
- System
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Lerche, E.
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Van Eester, D.
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Johnson, Thomas ...
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Hellsten, Torbjö ...
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Ongena, J.
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Mayoral, M-L
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show more...
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Frigione, D.
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Sozzi, C.
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Calabro, G.
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Lennholm, M.
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Beaumont, P.
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Blackman, T.
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Brennan, D.
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Brett, A.
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Cecconello, Marc ...
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Coffey, I.
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Coyne, A.
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Crombe, K.
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Czarnecka, A.
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Felton, R.
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Giroud, C.
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Gorini, G.
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Hellesen, Carl
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Jacquet, P.
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Kiptily, V.
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Knipe, S.
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Krasilnikov, A.
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Maslov, M.
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Monakhov, I.
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Noble, C.
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Nocente, M.
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Pangioni, L.
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Proverbio, I.
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Sergienko, G.
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Stamp, M.
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Studholme, W.
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Tardocchi, M.
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Vdovin, V.
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Versloot, T.
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Voitsekhovitch, ...
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Whitehurst, A.
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Wooldridge, E.
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Zoita, V.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
- Articles in the publication
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Plasma Physics a ...
- By the university
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Royal Institute of Technology
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Uppsala University