Journal Article

PreJuSER-23504

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Comparison of L-mode regimes with enhanced confinement by impurity seeding in JET and DIII-D

Jackson, G. L. ; Murakami, M. ; Baker, D. R. ; Budny, R. ; de Baar, M. R. ; Evans, T. E. ; Groebner, R. J. ; Hawkes, N. C. ; Hillis, D. L. ; Ingesson, L. C. ; Koslowski, H. R.FZJ* ; Lawson, K. D. ; Maddison, G. ; Mc Kee, G. R. ; Messiaen, A. M. ; Monier-Garbet, P. ; Nave, M. F. F. ; Ongena, J. ; Rapp, J.FZJ* ; Sartori, F. ; Staebler, G. M. ; Stamp, M. ; Strachan, J. D. ; Tokar, A. D.FZJ* ; Unterberg, B.FZJ* ; von Hellermann, M. ; Wade, M. R.FZJ*

2002
IOP Publ. Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/1763  doi:10.1088/0741-3335/44/9/307

Abstract: Impurity seeding in both the Joint European Torus (JET) and DIII-D tokamaks has produced L-mode discharges with confinement enhancements comparable to H-mode and a near doubling of the core ion temperature when compared,to similar unseeded discharges. Although Z(eff) increases with the neon injection, the total neutron rate is as high, or higher, than reference discharges and the calculated thermal neutron rate increases dramatically in both devices. Modelling with the gyrokinetic simulation code shows a reduction in low k turbulence growth rates with neon injection decreasing to less than the E x B shearing rate, consistent with stabilization of ion temperature gradient modes in both JET and DIII-D. Reductions in ion thermal diffusivity are also observed with impurity seeding. Neoclassical m/n = 3/2 tearing modes limit the duration of best performance in DIII-D with neon injection, while n = 1 and n = 2 magnetohydrodynamic modes limit the performance in JET.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut für Plasmaphysik (IPP)

Research Program(s):

1. Kernfusion und Plasmaforschung (E05)

Appears in the scientific report 2002
Notes: This version is available at the following Publisher URL: http://dx.doi.org/10.1088/0741-3335/44/9/307

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Database coverage:

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