Observation of zero current density in the core of jet discharges with lower hybrid heating and current drive |
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Authors: | Hawkes N C Stratton B C Tala T Challis C D Conway G DeAngelis R Giroud C Hobirk J Joffrin E Lomas P Lotte P Mailloux J Mazon D Rachlew E Reyes-Cortes S Solano E Zastrow K D |
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Affiliation: | Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, United Kingdom. |
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Abstract: | 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< or =0.2) of JET tokamak optimized 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. |
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