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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
- Article/chapterEnglish2012
Publisher, publication year, extent ...
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2012-06-22
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IOP Publishing,2012
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-99407
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99407URI
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https://doi.org/10.1088/0741-3335/54/7/074008DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178103URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20120731
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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.
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Van Eester, D.
(author)
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Johnson, Thomas JoeKTH,Fusionsplasmafysik(Swepub:kth)u1xypjyh
(author)
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Hellsten, TorbjörnKTH,Fusionsplasmafysik(Swepub:kth)u16w7v9f
(author)
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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, MarcoUppsala universitet,Tillämpad kärnfysik(Swepub:uu)marce924
(author)
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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, CarlUppsala universitet,Tillämpad kärnfysik(Swepub:uu)cahel173
(author)
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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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KTHFusionsplasmafysik
(creator_code:org_t)
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In:Plasma Physics and Controlled Fusion: IOP Publishing54:7, s. 074008-0741-33351361-6587
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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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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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Royal Institute of Technology
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