Improved confinement in high lilower hybrid driven steady state plasmas in TORE SUPRA
- 1 January 1994
- journal article
- Published by IOP Publishing in Nuclear Fusion
- Vol. 34 (1) , 75-85
- https://doi.org/10.1088/0029-5515/34/1/i05
Abstract
The global energy confinement of combined ohmic and lower hybrid driven TORE SUPRA plasmas has been analysed at various densities. In contradiction to the L mode ITER scaling law, this analysis indicates that the global energy confinement time depends strongly on the plasma density. Furthermore, the thermal electron energy content of steady state discharges is found to be in good agreement with the global Rebut-Lallia-Watkins (RLW) scaling law. Current ramp experiments show an enhancement of the global energy confinement with the internal inductance, li. These results have been extended to steady state regimes with lower hybrid current drive. Improved confinement has been obtained in a high li steady state plasma (li=1.7), where the modification of the current profile by lower hybrid waves leads to an increase in the central value of the safety factor (qψ(0) ≈ 2). In this case, the global confinement time is shown to exceed the value predicted by the RLW scaling law by 40%Keywords
This publication has 14 references indexed in Scilit:
- Transport properties of current driven tokamak plasmasPlasma Physics and Controlled Fusion, 1993
- One minute pulse operation in the TORE SUPRA tokamakNuclear Fusion, 1993
- Lower hybrid wave coupling in TORE SUPRA through multijunction launchersNuclear Fusion, 1992
- Effect of the ergodic divertor on electron thermal confinementNuclear Fusion, 1992
- Lower-hybrid current drive experiments in TORE SUPRAPhysics of Fluids B: Plasma Physics, 1992
- Simulations of deuterium-tritium experiments in TFTRNuclear Fusion, 1992
- High poloidal beta equilibria in the Tokamak Fusion Test Reactor limited by a natural inboard poloidal field nullPhysics of Fluids B: Plasma Physics, 1991
- Scalings for tokamak energy confinementNuclear Fusion, 1990
- Problems and methods of self-consistent reconstruction of tokamak equilibrium profiles from magnetic and polarimetric measurementsNuclear Fusion, 1990
- Energy confinement scaling in Tokamaks: some implications of recent experiments with Ohmic and strong auxiliary heatingPlasma Physics and Controlled Fusion, 1984