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  • Lerche, E. (author)

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 ...

  • 2012-06-22
  • IOP Publishing,2012
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-99407
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99407URI
  • https://doi.org/10.1088/0741-3335/54/7/074008DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178103URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20120731
  • 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 and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Van Eester, D. (author)
  • Johnson, Thomas JoeKTH,Fusionsplasmafysik(Swepub:kth)u1xypjyh (author)
  • Hellsten, TorbjörnKTH,Fusionsplasmafysik(Swepub:kth)u16w7v9f (author)
  • Ongena, J. (author)
  • Mayoral, M-L (author)
  • Frigione, D. (author)
  • Sozzi, C. (author)
  • Calabro, G. (author)
  • Lennholm, M. (author)
  • Beaumont, P. (author)
  • Blackman, T. (author)
  • Brennan, D. (author)
  • Brett, A. (author)
  • Cecconello, MarcoUppsala universitet,Tillämpad kärnfysik(Swepub:uu)marce924 (author)
  • Coffey, I. (author)
  • Coyne, A. (author)
  • Crombe, K. (author)
  • Czarnecka, A. (author)
  • Felton, R. (author)
  • Giroud, C. (author)
  • Gorini, G. (author)
  • Hellesen, CarlUppsala universitet,Tillämpad kärnfysik(Swepub:uu)cahel173 (author)
  • Jacquet, P. (author)
  • Kiptily, V. (author)
  • Knipe, S. (author)
  • Krasilnikov, A. (author)
  • Maslov, M. (author)
  • Monakhov, I. (author)
  • Noble, C. (author)
  • Nocente, M. (author)
  • Pangioni, L. (author)
  • Proverbio, I. (author)
  • Sergienko, G. (author)
  • Stamp, M. (author)
  • Studholme, W. (author)
  • Tardocchi, M. (author)
  • Vdovin, V. (author)
  • Versloot, T. (author)
  • Voitsekhovitch, I. (author)
  • Whitehurst, A. (author)
  • Wooldridge, E. (author)
  • Zoita, V. (author)
  • KTHFusionsplasmafysik (creator_code:org_t)

Related titles

  • In:Plasma Physics and Controlled Fusion: IOP Publishing54:7, s. 074008-0741-33351361-6587

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