Modeling of a lower-hybrid current drive by including spectral broadening induced by parametric instability in tokamak plasmas.
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 approximately equal to 0) is produced by LHCD in a layer close to the ITB radial foot.
Cesario
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Associazione EURATOM-ENEA sulla Fusione, Centro Ricerche Frascati c.p. 65, 00044 Frascati, Italy. cesario@frascati.enea.it
Cardinali
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Castaldo
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Paoletti
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Mazon
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