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  Control of sawteeth and triggering of NTMs with ion cyclotron resonance frequency waves in JET

Westerhof, E., Sauter, O., Mayoral, M. L., Howell, D. F., Mantsinen, M. J., Nave, M. F. F., et al. (2002). Control of sawteeth and triggering of NTMs with ion cyclotron resonance frequency waves in JET. Nuclear Fusion, 42(11), 1324-1334.

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Westerhof, E.1, Author
Sauter, O.1, Author
Mayoral, M. L.1, Author
Howell, D. F.1, Author
Mantsinen, M. J.1, Author
Nave, M. F. F.1, Author
Alper, B.1, Author
Angioni, C.2, Author              
Belo, P.1, Author
Buttery, R. J.1, Author
Gondhalekar, A.3, Author              
Hellsten, T.1, Author
Hender, T. C.1, Author
Johnson, T.1, Author
Lamalle, P.1, Author
Maraschek, M. E.3, Author              
McClements, K. G.1, Author
Nguyen, F.1, Author
Pecquet, A. L.1, Author
Podda, S.1, Author
Rapp, J.1, AuthorSharapov, S. E.1, AuthorZabiego, M.1, AuthorEFDA-JET Work Programme Collaborators1, Author more..
1EURATOM, FOM, TEC, FOM Rijnhuizen, NL-3430 BE Nieuwegein, Netherlands; Ecole Polytech Fed Lausanne, Assoc EURATOM Confederat, Ctr Rech Phys Plasmas, CH-1015 Lausanne, Switzerland; UKAEA Euratom Fus Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England; Helsinki Univ Technol, Assoc Euratom Tekes, FIN-02015 Espoo, Finland; Inst Super Tecn, Assoc Euratom IST, Ctr Fusao Nucl, P-1049001 Lisbon, Portugal; EFDA, JET CSU, Culham Sci Ctr, Abingdon OX14 3EA, Oxon, England; Swedish Res Council, Euratom VR Assoc, SE-10378 Stockholm, Sweden; Royal Mil Acad, TEC, Assoc Euratom Belgian State, LPP,ERM KMS, B-1000 Brussels, Belgium; CEA Cadarache, DSM,DRFC, Assoc EURATOM CEA, St Paul Les Durance, France; Ctr Ric Frascati, ENEA Fus, EURATOM Assoc, I-00044 Frascati, Rome, Italy; KFA Jülich GmbH, Forschungszentrum, EURATOM Assoc, Inst Plasmaphys, D-52425 Jülich, Germany, ou_persistent22              
2Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
3Experimental Plasma Physics 2 (E2), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856292              


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 Abstract: A new scenario to delay or prevent neoclassical tearing mode (NTM) onset is presented. By active sawtooth destabilization, short period and low amplitude sawteeth are generated, such that the sawtooth produced NTM seed island is reduced and the threshold normalized plasma pressure for triggering of NTMs, beta(Nonset), is increased. The scenario has been explored experimentally in the Joint European Torus (JET). Ion cyclotron resonance frequency (ICRF) waves tuned to the 2nd harmonic H- minority resonance have been used for sawtooth control. Whereas ICRF waves generally induce sawtooth stabilization, favouring the triggering of NTMs and reducing beta(Nonset), the present experiments show that by toroidally directed waves, ion cyclotron current drive is produced, and that sawteeth can be destabilized by careful positioning of the 2nd harmonic H resonance layer with respect to the sawtooth inversion radius. As a result, NTM onset is delayed and beta(Nonset) is increased above its value obtained in discharges with additional heating from neutral beam injection alone.


Language(s): eng - English
 Dates: 2002
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 23694
ISI: 000179669300008
 Degree: -



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Source 1

Title: Nuclear Fusion
  Alternative Title : Nucl. Fusion
Source Genre: Journal
Publ. Info: -
Pages: - Volume / Issue: 42 (11) Sequence Number: - Start / End Page: 1324 - 1334 Identifier: ISSN: 0029-5515