Effect of gas injection during LH wave coupling at ITER-relevant plasma-wall distances in JET (Articolo in rivista)

Type
Label
  • Effect of gas injection during LH wave coupling at ITER-relevant plasma-wall distances in JET (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0741-3335/51/4/044001 (literal)
Alternative label
  • Ekedahl A., Rantamäki K., Goniche M., Mailloux J., Petrzilka V., Alper B., Baranov Y., Basiuk V., Beaumont P., Corrigan G., Delpech L., Erents K., Granucci G., Hawkes N., Hobirk J., Imbeaux F., Joffrin E., Kirov K., Loarer T., McDonald D., Nave M. F. F., (2009)
    Effect of gas injection during LH wave coupling at ITER-relevant plasma-wall distances in JET
    in Plasma physics and controlled fusion (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ekedahl A., Rantamäki K., Goniche M., Mailloux J., Petrzilka V., Alper B., Baranov Y., Basiuk V., Beaumont P., Corrigan G., Delpech L., Erents K., Granucci G., Hawkes N., Hobirk J., Imbeaux F., Joffrin E., Kirov K., Loarer T., McDonald D., Nave M. F. F., (literal)
Pagina inizio
  • 044001 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 51 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. CEA, IRFM, F-13108 St Paul Les Durance, France 2. VTT, Assoc Euratom Tekes, FI-02044 Espoo, Finland 3. UKAEA, EURATOM Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England 4. Acad Sci Czech Republic, EURATOM Assoc, IPPCR, IPP, Prague 18221 8, Czech Republic 5. IFP, EURATOM Assoc, ENEA Fus, Milan, Italy 6. MPI Plasmaphys, EURATOM Assoc, D-85748 Garching, Germany 7. Ctr Fusao Nucl, EURATOM Assoc, IST, P-1049001 Lisbon, Portugal 8. ERM KMS, Assoc Euratom Belgian State, B-1000 Brussels, Belgium 9. KTH, SCI, Dept Phys, Assoc Euratom VR, SE-10691 Stockholm, Sweden 10. Culham Sci Ctr, JET EFDA, Abingdon OX14 3DB, Oxon, England (literal)
Titolo
  • Effect of gas injection during LH wave coupling at ITER-relevant plasma-wall distances in JET (literal)
Abstract
  • Good coupling of lower hybrid (LH) waves has been demonstrated in different H-mode scenarios in JET, at high triangularity (delta similar to 0.4) and at large distance between the last closed flux surface and the LH launcher ( up to 15 cm). Local gas injection of D(2) in the region magnetically connected to the LH launcher is used for increasing the local density in the scrape-off layer ( SOL). Reciprocating Langmuir probe measurements magnetically connected to the LH launcher indicate that the electron density profile flattens in the far SOL during gas injection and LH power application. Some degradation in normalized H-mode confinement, as given by the H98(gamma,2)-factor, could be observed at high gas injection rates in these scenarios, but this was rather due to total gas injection and not specifically to the local gas puffing used for LH coupling. Furthermore, experiments carried out in L-mode plasmas in order to evaluate the effect on the LH current drive efficiency, when using local gas injection to improve the coupling, indicate only a small degradation (Delta I(LH)/I(LH) similar to 15%). This effect is largely compensated by the improvement in coupling and thus increase in coupled power when using gas puffing. (literal)
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