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

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
Type
Published Article
Journal
Physical review letters
Publication Date
Sep 10, 2001
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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