Momentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple

TitleMomentum transport studies in JET H-mode discharges with an enhanced toroidal field ripple
Publication TypeJournal Article
Year of Publication2010
AuthorsP.C de Vries, T.W Versloot, A. Salmi, M.D Hua, D.H Howell, C. Giroud, V. Parail, G. Saibene, T. Tala
JournalPlasma Physics and Controlled Fusion
Date PublishedJun
Type of ArticleArticle
ISBN Number0741-3335
Accession NumberISI:000277562200004

In this study, enhancement of the toroidal field (TF) ripple has been used as a tool in order to reveal the impact of the momentum pinch on the rotation profiles in H-mode JET discharges. The analysis showed that flatter rotation profiles were obtained in discharges with a high TF ripple, attributed to a smaller inward momentum convection. An average inward momentum pinch of approximately V-p approximate to 3.4 m s(-1) and a normalized pinch value of RVp/chi approximate to 6.6 could explain the observation. The data show that the momentum at the edge affects the peaking of the rotation and momentum density profiles. Under the assumption that the heat and momentum diffusivities are equal, an estimate of the levels of the momentum pinch in all discharges in the JET rotation database was made. For H-mode discharge these ranged from 0.3 m s(-1)< V-p < 17 m s(-1), with 2 < RVp/chi < 10. A larger momentum pinch was found in discharges with a smaller density profile gradient length, i.e. a more peaked density profile.

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Fusion Physics



Alternate TitlePlasma Phys. Control. Fusion

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