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  Role of sawtooth in avoiding impurity accumulation and maintaining good confinement in JET radiative mantle discharges

Nave, M. F. F., Rapp, J., Bolzonella, T., Dux, R., Mantsinen, M. J., Budny, R., et al. (2003). Role of sawtooth in avoiding impurity accumulation and maintaining good confinement in JET radiative mantle discharges. Nuclear Fusion, 43(10), 1204-1213. doi:10.1088/0029-5515/43/10/023.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-2ED4-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-2EE1-D
Genre: Journal Article

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Nave, M. F. F.1, Author
Rapp, J.1, Author
Bolzonella, T.1, Author
Dux, R.2, Author              
Mantsinen, M. J.1, Author
Budny, R.1, Author
Dumortier, P.1, Author
von Hellermann, M.1, Author
Jachmich, S.1, Author
Koslowski, H. R.1, Author
Maddison, G.1, Author
Messiaen, A.1, Author
Monier-Garbet, P.1, Author
Ongena, J.1, Author
Puiatti, M. E.1, Author
Strachan, J.1, Author
Telesca, G.1, Author
Unterberg, B.1, Author
Valisa, M.1, Author
de Vries, P.1, Author
Contributors to the JET-EFDA Workprogramme, Author   more..
Affiliations:
1Associação EURATOM/IST, Centro de Fusão Nuclear, 1049-001 Lisbon, Portugal; Association EURATOM-FZ-Juelich, Institut fuer Plasmaphysik, TEC, 52425 Juelich, Germany; Consorzio RFX—Associazione Euratom-Enea sulla Fusione, Corso Stati Uniti 4, I-35127 Padova, Italy; Helsinki University of Technology, Association Euratom-Tekes, PO Box 2200, FIN-02015 HUT, Finland; PPPL, Princeton University, NJ, USA; LPP-ERM/KMS, Association Euratom-Belgian State, Brussels, Belgium; Associatie EURATOM-FOM, Rijnhuizen, PO Box 1207, 3430 BE, Netherlands; Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, UK; Association EURATOM/CEA CEA CADARACHE, DRFC, Bâtiment 513, 13108 Saint-Paul-Lez-Durance, France, ou_persistent22              
2Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              

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 Abstract: Impurity injection in the JET ELMy H-mode regime has produced high-confinement, quasi-steady-state plasmas with densities close to the Greenwald density. However, at large Ar densities, a sudden loss of confinement is observed. A possible correlation between loss of confinement and the observed MHD phenomena, both in the core and in the edge of the plasma, was considered. The degradation in confinement coincided with impurity profile peaking following the disappearance of sawtooth activity. In addition, impurity density profile analysis confirmed that central MHD modes prevented impurity peaking. Experiments were designed to understand the role of sawtooth crashes in re-distributing impurities. Ion-cyclotron radio frequency heating was used to control the central q-profile and maintain sawtooth activity. This resulted in quasi-steady-state, high-performance plasmas with high Ar densities. At H<sub>98y</sub> * f<sub>GWD</sub> ~ 0.8 and high Ar injection rates, quasi-steady-states, which previously only lasted <1τ<sub>E</sub>, were now maintained for the duration of the heating ( Δt ~ 9τ<sub>E</sub>). The increased central heating may have an additional beneficial effect in opposing impurity accumulation by changing the core power balance and modifying the impurity transport as predicted by neo-classical theory.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
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 Rev. Type: Peer
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Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
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Publ. Info: Copyright © Institute of Physics and IOP Publishing Limited 2003
Pages: - Volume / Issue: 43 (10) Sequence Number: - Start / End Page: 1204 - 1213 Identifier: -