Ultra-long pulse operation using lower hybrid waves on the superconducting high field tokamak TRIAM-1M

1 January 1990

journal article
Published by IOP Publishing in Nuclear Fusion

Vol. 30 (1) , 47-57
https://doi.org/10.1088/0029-5515/30/1/005

Abstract

Ultra-long pulse operation (> 3 min) was achieved on the superconducting high field tokamak TRIAM-1M. In this operation, the plasma current was maintained with a relatively peaked current distribution by the 2.45 GHz radiofrequency power (P_RF ≤ 35 kW) alone. A stationary plasma with a driven current of up to 35 kA and a line averaged electron density of up to 3 × 10¹² cm⁻³ was produced by precise plasma position and gas feed control. The extremely long discharge showed the interesting characteristics that the high temperatures of about 1 keV for the electrons and about 0.5 keV for the ions were kept almost constant during steady state current drive and that there was no impurity accumulation which could have a fatally adverse effect on steady state tokamak operation.

Keywords

This publication has 0 references indexed in Scilit: