Parametric dependences of momentum pinch and Prandtl number in JET (Articolo in rivista)

Type
Label
  • Parametric dependences of momentum pinch and Prandtl number in JET (Articolo in rivista) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/51/12/123002 (literal)
Alternative label
  • Tala, T [ 1 ] ; Salmi, A [ 3 ] ; Angioni, C [ 4 ] ; Casson, FJ [ 4 ] ; Corrigan, G [ 5 ] ; Ferreira, J [ 6 ] ; Giroud, C [ 5 ] ; Mantica, P [ 7 ] ; Naulin, V ; Peeters, AG [ 8 ] ; Solomon, WM [ 9 ] ; Strintzi, D [ 8 ] ; Tsalas, M [ 10 ] ; Versloot, TW [ 10 ] ; de Vries, PC [ 10 ] ; Zastrow, KD [ 5 ]; and JET EFDA contributors (2011)
    Parametric dependences of momentum pinch and Prandtl number in JET
    in Nuclear fusion
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Tala, T [ 1 ] ; Salmi, A [ 3 ] ; Angioni, C [ 4 ] ; Casson, FJ [ 4 ] ; Corrigan, G [ 5 ] ; Ferreira, J [ 6 ] ; Giroud, C [ 5 ] ; Mantica, P [ 7 ] ; Naulin, V ; Peeters, AG [ 8 ] ; Solomon, WM [ 9 ] ; Strintzi, D [ 8 ] ; Tsalas, M [ 10 ] ; Versloot, TW [ 10 ] ; de Vries, PC [ 10 ] ; Zastrow, KD [ 5 ]; and JET EFDA contributors (literal)
Pagina inizio
  • 123002 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://iopscience.iop.org/0029-5515/51/12/123002/ (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 51 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 12 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [ 1 ] Assoc EURATOM Tekes, VTT, FIN-02044 Espoo, Finland [ 2 ] Culham Sci Ctr, JET EFDA, Abingdon OX14 3DB, Oxon, England [ 3 ] Aalto Univ, Assoc EURATOM Tekes, Dept Appl Phys, Helsinki, Finland [ 4 ] EURATOM Assoziat, Max Planck Iinst Plasmaphys, Garching, Germany [ 5 ] EURATOM CCFE Fusion Assoc, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England [ 6 ] Assoc EURATOM IST, Inst Plasmas & Fusao Nucl, P-1049001 Lisbon, Portugal [ 7 ] Istituto di Fisica del Plasma CNR EURATOM, I-20125 Milan, Italy [ 8 ] Univ Bayreuth, Dept Phys, D-95440 Bayreuth, Germany [ 9 ] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA [ 10 ] EURATOM, FOM Inst Rijnhuizen, Nieuwegein, Netherlands (literal)
Titolo
  • Parametric dependences of momentum pinch and Prandtl number in JET (literal)
Abstract
  • Several parametric scans have been performed to study momentum transport on JET. A neutral beam injection modulation technique has been applied to separate the diffusive and convective momentum transport terms. The magnitude of the inward momentum pinch depends strongly on the inverse density gradient length, with an experimental scaling for the pinch number being - Rv(pinch)/chi(phi) = 1.2R/L-n + 1.4. There is no dependence of the pinch number on collisionality, whereas the pinch seems to depend weakly on q-profile, the pinch number decreasing with increasing q. The Prandtl number was not found to depend either on R/L-n, collisionality or on q. The gyro-kinetic simulations show qualitatively similar dependence of the pinch number on R/L-n, but the dependence is weaker in the simulations. Gyro-kinetic simulations do not find any clear parametric dependence in the Prandtl number, in agreement with experiments, but the experimental values are larger than the simulated ones, in particular in L-mode plasmas. The extrapolation of these results to ITER illustrates that at large enough R/L-n > 2 the pinch number becomes large enough (>3-4) to make the rotation profile peaked, provided that the edge rotation is non-zero. And this rotation peaking can be achieved with small or even with no core torque source. The absolute value of the core rotation is still very challenging to predict partly due to the lack of the present knowledge of the rotation at the plasma edge, partly due to insufficient understanding of 3D effects like braking and partly due to the uncertainties in the extrapolation of the present momentum transport results to a larger device. (literal)
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