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McDonald, D. C. [Author]; Cordey, E. [Author]; de Baar, M. [Author]; de Vries, P. C. [Author]; Erents, K. [Author]; Fundamenski, W. [Author]; Giroud, C. [Author]; Jenkins, I. [Author]; Loarte, A. [Author]; Lomas, P. [Author]; Maddison, G. [Author]; Mailloux, J. [Author]; Righi, F. [Author]; Murari, D. M. [Author]; Ongena, J. [Author]; Rapp, J. [Author]; Pitts, R. [Author]; Strachan, J. [Author]; Suttrop, W. [Author]; Ryter, F. [Author]; Saibene, G. [Author]; Sartori, R. [Author]; Alper, B. [Author]; Bécoulet, M. [Author]; [...]

ELMy H-modes in JET helium-4 plasmas

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  • Media type: E-Article
  • Title: ELMy H-modes in JET helium-4 plasmas
  • Contributor: McDonald, D. C. [Author]; Cordey, E. [Author]; de Baar, M. [Author]; de Vries, P. C. [Author]; Erents, K. [Author]; Fundamenski, W. [Author]; Giroud, C. [Author]; Jenkins, I. [Author]; Loarte, A. [Author]; Lomas, P. [Author]; Maddison, G. [Author]; Mailloux, J. [Author]; Righi, F. [Author]; Murari, D. M. [Author]; Ongena, J. [Author]; Rapp, J. [Author]; Pitts, R. [Author]; Strachan, J. [Author]; Suttrop, W. [Author]; Ryter, F. [Author]; Saibene, G. [Author]; Sartori, R. [Author]; Alper, B. [Author]; Bécoulet, M. [Author]; [...]
  • imprint: IOP Publ., 2004
  • Published in: Plasma physics and controlled fusion 46, 519 (2004). doi:10.1088/0741-3335/46/3/007
  • Language: English
  • DOI: https://doi.org/10.1088/0741-3335/46/3/007
  • ISSN: 0741-3335
  • Keywords:
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: ELMy H-modes in helium-4 plasmas provide valuable information on ELMy H-mode physics as well as a possible early low activation operational phase for next-step tokamaks, such as ITER. With this in mind, a series of helium-4 H-mode experiments were performed on JET with pure helium-4 NBI auxiliary heating (up to 12 MW). A set of ELMy H-mode plasmas were produced, in both the Type I ELM regime and a second regime, which showed characteristics similar to the deuterium Type III regime, but with a reverse ELM frequency dependence on power. Sawteeth were also observed, and had similar behaviour to those seen in deuterium. Compared with deuterium plasmas, Type I ELMy H-mode confinement is seen to be 28 +/- 6% poorer in helium-4 plasmas and the L-H power threshold 42 +/- 10% larger. This is the opposite of the behaviour predicted by experimental isotope mass scalings from hydrogenic plasmas.Comparison with a wider hydrogenic database, enables the effects of isotopic charge and mass to be studied independently.
  • Access State: Open Access