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Simultaneous current ramping and application of lower hybrid heating and current drive (LHCD) have produced a region with zero current density within measurement errors in the core (r/a equals or is less than 0.2) of JET tokamak optimised shear discharges. The reduction of core current density is consistent with a simple physical explanation and numerical simulations of radial current diffusion including the effects of LHCD. However, the core current density is clamped at zero, indicating the existence of a physical mechanism, which prevents it from becoming negative.

Additional information

Authors: HAWKES N C ET AL, UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire (GB);STRATTON B C, Princeton Plasma Physics Laboratory, New Jersey (US);TALA T, VTT Chemical Technology, Espoo (FI);CONWAY G, Max-Planch-Institut fur Plasmaphysik, Garching (DE);HOBIRK J, Max-Planch-Institut fur Plasmaphysik, Garching (DE);DEANGELIS R, ENEA sulla Fusione, CRE Frascati, Roma (IT);GIROUD C ET AL, CEA Cadarache, Departement de Recherches sur la Fusion Controlee, St Paul lez Durance (FR);RACHLEW E, Royal Institute of Technology, Department of Physics, Stockholm (SE);REYES-CORTES S, Centro de Fusao Nuclear, Lisbon (PT);SOLANO E, CIEMAT para FUSION, Madrid (ES and EFDA CSU JET, Abingdon, Oxfordshire (GB)
Bibliographic Reference: An article published in: Physical Review Letters, Vol.87, No.11 (2001), pp.115001-1 - 115001-4
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