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Metal impurity transport control in JET H-mode plasmas with central ion cyclotron radiofrequency power injection (Articolo in rivista)

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Metal impurity transport control in JET H-mode plasmas with central ion cyclotron radiofrequency power injection (Articolo in rivista) (literal)

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M. Valisa; L. Carraro; I. Predebon; M.E. Puiatti; C. Angioni; I. Coffey; C. Giroud; L. Lauro Taroni; B. Alper; M. Baruzzo; P. Belo daSilva; P. Buratti; L. Garzotti; D. Van Eester; E. Lerche; P. Mantica; V. Naulin; T. Tala; M. Tsalas; JET-EFDA contributors (2011)
Metal impurity transport control in JET H-mode plasmas with central ion cyclotron radiofrequency power injection
in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria)
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M. Valisa; L. Carraro; I. Predebon; M.E. Puiatti; C. Angioni; I. Coffey; C. Giroud; L. Lauro Taroni; B. Alper; M. Baruzzo; P. Belo daSilva; P. Buratti; L. Garzotti; D. Van Eester; E. Lerche; P. Mantica; V. Naulin; T. Tala; M. Tsalas; JET-EFDA contributors (literal)

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Article Number: 033002 - La rivista è pubblicata anche online con ISSN 1741-4326, Editore: Institute of Physics Publishing (IOP) Bristol, GB (literal)

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1 Consorzio RFX-Associazione EURATOM-ENEA sulla Fusione, Padova, Italy; - 2 Max Planck Institut für Plasmaphysik, EURATOM-IPP Association, D-85748 Garching, Germany; - 3 Department of Physics, Queen's University, Belfast, UK; - 4 EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, UK; - 5 EURATOM/IST 5Fusion Association, Instituto de Plasmas e Fusão Nuclear, Av. Rovisco Pais 1049-001 Lisbon, Portugal; - 6 EURATOM-ENEA Association, C.R. Frascati, CP 65, 00044 Frascati, Italy; - 7 Association EURATOM-Belgian State, LPP-ERM/KMS, Partner in TEC, B-1000 Brussels, Belgium; - 8 Associazione EURATOM-ENEA sulla Fusione, Via Cozzi, Milano, Italy; - 9 Association EURATOM-Risoe DTU, Frederiksborgvej 399, 4000 Roskilde, Denmark; - 10 Association Euratom-Tekes, VTT, PO Box 1000 FI-02044 VTT, Finland; - 11 EFDA CSU Culham, Culham Science Centre, Abingdon, OX14 3DB, UK; - Contributors: JET-EFDA, Culham Science Centre, OX14 3DB, Abingdon, UK. - (M. Valisa1, L. Carraro1, I. Predebon1, M.E. Puiatti1, C. Angioni2, I. Coffey3, C. Giroud4, L. Lauro Taroni1, B. Alper4, M. Baruzzo1, P. Belo daSilva5, P. Buratti6, L. Garzotti4, D. Van Eester7, E. Lerche7, P. Mantica8, V. Naulin9, T. Tala10, M. Tsalas11 and JET-EFDA contributors) (literal)

Titolo

Metal impurity transport control in JET H-mode plasmas with central ion cyclotron radiofrequency power injection (literal)

Abstract

The scan of ion cyclotron resonant heating (ICRH) power has been used to systematically study the pump out effect of central electron heating on impurities such as Ni and Mo in H-mode low collisionality discharges in JET. The transport parameters of Ni and Mo have been measured by introducing a transient perturbation on their densities via the laser blow off technique. Without ICRH Ni and Mo density profiles are typically peaked. The application of ICRH induces on Ni and Mo in the plasma centre (at normalized poloidal flux rho = 0.2) an outward drift approximately proportional to the amount of injected power. Above a threshold of ICRH power of about 3 MW in the specific case the radial flow of Ni and Mo changes from inwards to outwards and the impurity profiles, extrapolated to stationary conditions, become hollow. At mid-radius the impurity profiles become flat or only slightly hollow. In the plasma centre the variation of the convection-to-diffusivity ratio upsilon/D of Ni is particularly well correlated with the change in the ion temperature gradient in qualitative agreement with the neoclassical theory. However, the experimental radial velocity is larger than the neoclassical one by up to one order of magnitude. Gyrokinetic simulations of the radial impurity fluxes induced by electrostatic turbulence do not foresee a flow reversal in the analysed discharges. (literal)

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