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Lower hybrid current drive in tokamak plasmas allows to obtain continuous operations, which constitute a necessary step towards a definition of a thermonuclear fusion reactor. The objectives of this work is to define and study fully non inductive steady-state scenarios on Tore Supra.
The current diffusion equation is solved to determined precisely the inductive and non inductive current density profiles and their influence on the time evolution of a discharge.
Then, a new operation mode is studied theoretically and experimentally. In this scenario, the transformer primary circuit voltage is controlled in such a way that the flux consumption vanishes. It allows to achieve full steady-state discharges in a fast and reproducible manner.
A theoretical flux consumption scaling law during plasma current ramp-up assisted by lower hybrid waves is presented and validated by experimental data, in view to minimized this consumption.
The influence of a non monotonic current density profile on the confinement and the transport of energy in the plasma is also clearly illustrated by experiments. ts.

Additional information

Authors: KAZARIAN-VIBERT F, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Article: CEN Cadarache Laboratory Report (1996) EUR-CEA-FC-1584
Record Number: 199611244 / Last updated on: 1996-11-11
Original language: fr
Available languages: fr
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