1094 / 2019-10-29 10:59:06

Study of advanced scenarios on EAST tokamak

全体主题 > 磁约束核聚变实验

Steady-state long-pulse H-mode discharge has been obtained using RF heating and current drive with dominant electron heating on EAST tokamak. Demonstration of >100 seconds time scale long-pulse steady-state scenario with a good plasma performance (H98y2 ~1.1) and a good control of impurity and heat exhaust with the tungsten divertor has been successfully achieved on EAST using RF power heating and current drive. Recently, a high beta-p discharge was successfully maintained over 24s with improved hardware capabilities, demonstrating performance levels needed for China Fusion Engineering Test Reactor (CFETR) steady-state operation. The observed improvement in plasma confinement is much better (H98y2 ~ 1.3) when compared with the RF dominant heating experiments in the EAST 2016 - 2017 experimental campaign (H98y2 ~ 1.1). Integrated modeling prediction suggests that high electron density would increase the plasma performance and bootstrap current fraction, which is consistent with the general experimental trend. The Shafranov shift is shown to play a role in the suppression of the electron turbulent energy transport in the high beta-P RF-only discharges. Besides, extensive experiments of high beta-N scenario development have been carried out on EAST.