Central fuelling and pellet enhanced performance modes have been obtained with pellets injected vertically from the high field side on the FTU tokamak. Four phases have been recognized: ablation of the pellets, drifting plasmoids, MHD modes which take the density to the centre of the discharge and finally an anomalous drift which further increases the density peaking. Pellet ablation data have been compared with values from a pellet ablation and deposition code. Comparison between 0.8 and 1.1 MA discharges at a high magnetic field (BT = 7 T) has been carried out: a higher performance has been obtained with the latter due to the higher target density and the larger inversion radius which would increase the effects of m = 1 modes to take the density to the plasma centre.
在FTU托卡马克上，通过从高场侧垂直注入弹丸，获得了中心加料和高性能模式。识别出四个阶段：弹丸烧蚀、漂移等离子体团、将密度输运至中心的MHD模，以及最终进一步增强密度峰化的反常漂移。弹丸烧蚀数据与烧蚀-沉积代码的计算结果进行了比较。对0.8 MA和1.1 MA放电（高磁场BT = 7 T）进行了对比：后者获得了更高性能，这归因于更高的目标密度和更大的反转半径，从而增强了m = 1模将密度输运至等离子体中心的作用。