Modeling of a Lower-Hybrid Current Drive by Including Spectral Broadening Induced by Parametric Instability in Tokamak Plasmas

R. Cesario, A. Cardinali, C. Castaldo, F. Paoletti, and D. Mazon

Phys. Rev. Lett. 92, 175002 – Published 27 April 2004

Abstract

By incorporating parametric instabilities of lower hybrid (LH) waves into a ray-tracing Fokker-Planck code, accurate simulations of the LH deposition profiles are provided, which are useful for interpreting the long-lasting internal transport barriers (ITBs) sustained by lower hybrid current drive (LHCD) on JET (Joint European Torus). Utilizing the new model, the simulation of the $q$ -profile evolution results in agreement with that provided by the motional Stark effect reconstructed equilibria. Low magnetic shear ( $s \approx 0$ ) is produced by LHCD in a layer close to the ITB radial foot.

Received 29 September 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.175002

Authors & Affiliations

R. Cesario^1,*, A. Cardinali¹, C. Castaldo¹, F. Paoletti², and D. Mazon³

¹Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Frascati c.p. 65, 00044 Frascati, Italy
²East Windsor Regional School District, Hightstown, New Jersey 08520, USA
³Association Euratom-CEA, CEA Cadarache 13108, St Paul lez Durance, France

^*Electronic address: cesario@frascati.enea.it

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Vol. 92, Iss. 17 — 30 April 2004

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