Current and pressure profile control using ECCD and ECH in TCV
Steerable mirrors allow the change of both the poloidal and toroidal launcher angles in TCV. Both ECH and ECCD experiments have been performed in order to demonstrate the modifications of the electron temperature and current profiles. Full replacement of 153kA with central co-ECCD using three 0.5MW gyrotrons for 100 ms has been achieved. This led to very peaked pressure, however, and current profiles which were unstable and eventually led to disruption. Using a scenario with simultaneous on and off-axis co-ECCD a fully non-inductive steady-state scenario has been obtained. A careful choice of the plasma current is needed to exactly replace the ohmic plasma current. Confirms a significant current drive efficiency for far off-axis ECCD.
Bibliographic Reference: Article: 26th EPS Conference on Controlled Fusion and Plasma Physics, (1999)
Record Number: 199911083 / Last updated on: 1999-08-06
Original language: en
Available languages: en