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Abstract

The lower hybrid current drive (LHCD) system for FTU has a modular configuration that gives it a high degree of flexibility in operations. The system normally operates with six conventional grills (CG), each one made of four superimposed rows of 12 waveguides, distributed on two independent launching structures. This modular configuration has given the possibility of testing on FTU a classical multijunction (MJ) and a passive active multijunction (PAM) that is considered as a privileged candidate for the LH launcher for ITER. The tests have confirmed the good coupling properties of the MJ with plasma densities lower than those normally acceptable for a CG, but at expenses of a reduced power directivity and flexibility in N//. The PAM, with a small reduction on power directivity and flexibility in N// with reference to the MJ, has shown an efficient coupling when working close to cut-off density (0.8 x 10{18}m{-3}) flush to the first wall, a relatively quiet region in the harsh plasma environment of ITER. The paper presents an overview of the performances, in term of coupling characteristics, of the three launchers on FTU and gives a comparative analysis of the results obtained in similar plasma conditions, in particular during the same shot.
Proceedings of the 24th Symposium on Fusion Technology - SOFT-24

Additional information

Authors: MIRIZZI F, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);CALABRÒ G, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);PERICOLI RIDOLFINI V, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);TUCCILLO A A, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);BIBET PH, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Fusion Engineering and Design, Volume 82, Issues 5-14 (2007), pp. 751-757
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1016/j.fusengdes.2007.05.068
Record Number: 200819669 / Last updated on: 2008-02-15
Category: PUBLICATION
Original language: en
Available languages: en