ELMy H-modes in JET helium-4 plasmas

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

doi:10.1088/0741-3335/46/3/007

Journal Article

ELMy H-modes in JET helium-4 plasmas

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

2004
IOP Publ. Bristol

Plasma physics and controlled fusion 46, 519 (2004) [10.1088/0741-3335/46/3/007]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1809 doi:10.1088/0741-3335/46/3/007

Abstract: 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.

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