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Document Version Version Comment Date Status
60446.0 [No comment] 15.11.2006 15:44 Released

ID: 60446.0, MPI für Plasmaphysik / Conference Papers
Sawtooth, neo-classical tearing mode and error field
studies in JET
Authors:Hender, T. C.; Sauter, O.; Alper, B.; Angioni, C.; de Baar, M. R.; De Benedetti, M.; Belo, P.; Bigi, M.; Borba, D. N.; Bolzonella, T.; Budny, R.; Buttery, R. J.; Gondhalekar, A.; Gorelenkov, N. N.; Gude, A.; Günter, S.; Hellsten, T.; Howell, D. F.; Koslowski, R.; La Haye, R. J.; Hyatt, A. W.; Lamalle, P.; Lazzaro, E.; Mantsinen, M. J.; Maraschek, M.; Mayoral, M. L.; McClements, K. G.; Milani, F.; Nabais, F.; Nave, M. F. F.; Nguyen, F.; Nowak, S.; Pecquet, A.-L.; Perez, C.; Petty, C. C.; Pinches, S. D.; Pochelon, A.; Podda, S.; Rapp, J.; Salzedas, F.; Sartori, F.; Sharapov, S. E.; Stamp, M.; Testa, D.; Westerhof, E.; de Vries, P. C.; Zanca, P.; JET EFDA Contributors
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/S1-2
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:A range of ITER relevant plasma stability issues has been studied in the JET tokamak; these include
the effects of fast particles on sawteeth, control of NTMs via sawtooth seeds, scaling of m=2, n=1 NTM
thresholds and the effect of error fields on plasma rotation and vice-versa. The sawtooth studies have examined
both the effects of ICRF and NBI fast particles, and models used for ITER predictions have been validated.
Large sawteeth, due to fast particle stabilisation, have been shown to trigger m=3, n=2 NTMs at low beta.
Conversely the use of ICRF to produce small short-period sawteeth has been shown to raise the NTM β-limit,
indicating the value of local heating and current drive near q=1. The marginal-β (βΝ,marg)below which the m=3,
n=2 NTM is unconditionally stable has been examined; it is found that βΝ,marg scales almost linearly with ρ* and
typical H-mode (with q95≈3) discharges are meta-stable to NTMs (ie a sufficiently large seed can always
destabilise an NTM). The m=2, n=1 NTM has been studied in a joint scaling experiment with the DIII-D
tokamak. These experiments, using closely matched non-dimensional parameters (plasma shape, R/a, q, gyro-radius
and collisionality) on DIII-D and JET, show similar NTM β-limits and consistent scalings. The issue of
error field thresholds and their variation with plasma rotation has also been studied, helping to clarify scalings to ITER.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/TOK
External Affiliations:EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, United Kingdom; CRPP, Assoc. Euratom-Confédération Suisse, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland; FOM-Rijnhuizen, Assoc. Euratom-FOM, Nieuwegein, Netherlands; CRE ENEA, Assoc. EURATOM-ENEA, Frascati, Italy; Assoc. Euratom/IST, Centro de Fusão Nuclear, Lisboa, Portugal; EFDA-JET CSU, Culham Science Centre, Abingdon, Oxfordshire, UK; Consorzio RFX Assoc. Euratom-ENEA-CNR, Padova, Italy; Princeton Plasma Physics Laboratory, Princeton, NJ, USA; KTH Assoc. Euratom/NFR, Stockholm, Sweden; Forschungszentrum Jülich GmbH, Assoc. EURATOM-FZ Jülich, Jülich, Germany; General Atomics, San Diego, USA; ERM/KMS, Euratom-Belgian State Assoc. Brussels, Belgium; IFP CNR Assoc. Euratom-ENEA-CNR, Milan, Italy; Helsinki University of Technology, Association Euratom-Tekes, Finland; Association Euratom-CEA sur la Fusion Contrôlée, Cadarach, France; Plasma Science and Fusion Center, Massachusetts Institute of Technology, Boston, USA