Plasma current ramp-up and Ohmic-heating transformer recharging experiments using lower-hybrid waves on a tokamak
- 1 April 1987
- journal article
- conference paper
- Published by AIP Publishing in Physics of Fluids
- Vol. 30 (4) , 1169-1176
- https://doi.org/10.1063/1.866316
Abstract
Plasma current ramp‐up by lower‐hybrid waves in a high‐density regime (n̄e≳1×1019 m−3) is investigated on the Alcator C tokamak [Nucl. Fusion 2 5, 1127 (1985)]. A time‐averaged conversion efficiency (Ẇ−Pext)/Prf of over 15% has been obtained at a density of n̄e ≂1×1019 m−3, where W is the poloidal field energy and Pext is the external inductive power. The maximum conversion efficiency obtainable is lower at higher densities. Ramp‐up rates of over 1 MA/sec were obtained when rf current ramp‐up is applied to an Ohmically maintained plasma. Lower‐hybrid current drive can also be used to maintain the plasma while recharging the Ohmic‐heating transformer. The conversion efficiency of 10% obtained during recharging is found to be comparable to that obtained during ramp‐up under similar conditions.Keywords
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