Comparison of steady‐state and perturbative transport coefficients in TFTR

Steady‐state and perturbative transport analysis are complementary techniques for the study of transport in tokamaks. These techniques are applied to the investigation of auxiliary‐heated L‐mode and supershot plasmas in the tokamak fusion test reactor (TFTR) [R. J. Hawryluk e t a l., P l a s m a P h y s i c s a n d C o n t r o l l e d N u c l e a r F u s i o n R e s e a r c h, Proceedings of the 11th International Conference, Kyoto, 1986 (IAEA, Vienna, 1987), Vol. 1, p. 51.]. In the L mode, both steady‐state and perturbative transport measurements reveal a strong temperature dependence that is consistent with electrostatic microinstability theory and the degradation of confinement with neutral beam power. Steady‐state analysis of the ion heat and momentum balance in supershots indicates a reduction and a significant weakening of the power‐law dependence on the transport in the center of the discharge.