The effect of collisional dissipation on the radial profiles of current driven by the lower-hybrid waves

A simulation of the collisional dissipation of fast electrons has been conducted in lower-hybrid-current drive (LHCD) tokamak plasmas. The simulation results show that the dissipation of fast electrons will counteract the effect of radial diffusion to some extent, thereby making the LHCD current pro...

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Bibliographic Details
Published in:Physics of plasmas 2008-06, Vol.15 (6)
Main Authors: Li, Dehui, Kuang, Guangli, Wang, Shaojie
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COLLISIONS
CURRENTS
DEPOSITION
ELECTRONS
LOWER HYBRID CURRENT DRIVE
LOWER HYBRID HEATING
MAGNETIC FIELD CONFIGURATIONS
PLASMA
PLASMA CONFINEMENT
PLASMA SIMULATION
REVERSED SHEAR
STEADY-STATE CONDITIONS
TOKAMAK DEVICES
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Summary:A simulation of the collisional dissipation of fast electrons has been conducted in lower-hybrid-current drive (LHCD) tokamak plasmas. The simulation results show that the dissipation of fast electrons will counteract the effect of radial diffusion to some extent, thereby making the LHCD current profile closer to the power deposition profile. It seems that the dissipation is helpful to maintain a steady state “hole current profile” in LHCD plasmas; thereby, the desired reversed magnetic shear should be maintained.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2928163