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Observation of zero current density in the core of jet discharges with lower hybrid heating and current drive.

Authors
Type
Published Article
Journal
Physical review letters
Publication Date
Volume
87
Issue
11
Pages
115001–115001
Identifiers
PMID: 11531529
Source
Medline
License
Unknown

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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