H-mode pedestal structure in the variation of toroidal rotation and toroidal field ripple in JT-60U
H-mode pedestal structure in the variation of toroidal rotation and toroidal field ripple in JT-60U
复制标题
DOI：
10.1088/0029-5515/47/7/022
复制
发表时间：
2007-06
期刊：
影响因子：
3.3
通讯作者：
H. Urano;N. Oyama;K. Kamiya;Y. Koide;H. Takenaga;T. Takizuka;M. Yoshida;Y. Kamada
中科院分区：
文献类型：
--
作者：
H. Urano;N. Oyama;K. Kamiya;Y. Koide;H. Takenaga;T. Takizuka;M. Yoshida;Y. Kamada
研究了JT-60 U环向旋转和环向场（TF）涟漪对边缘基座结构和边缘局域模（ELMs）的影响。通过安装铁素体钢瓦（FST）改变TF涟漪的幅度。与FST相比，环形旋转VT的轮廓变得不那么相反，特别是在大体积配置中使用co-NBI的情况下。在这种情况下，等离子体压力在等离子体的整个轮廓上升高。在等离子体边缘，随着基座宽度的增加，基座温度升高。然而，FST的效果在小体积配置中变得不那么显著。随着VT在基座处变得更少，ELM频率fELM减小，并且在穿过分界线Psep的固定功率下，ELM能量损耗ΔWELM增加。在VT处观察到的在相对同方向上的较大ELM能量降涉及在径向更向内延伸的ELM上的电子温度分布的ELM扰动。此外，ELM间的输运损失减小，基座压力Pp略有升高。FST的影响在大体积配置中明显出现，其中即使在基座处的给定VT下，ppp也会升高，而在小体积配置中，ppp不会被FST改变。这表明，TF涟漪的减少，其幅度可以影响VT曲线，在增加的pp中起作用。对于由于使用co-NBI和TF涟漪的减少而增加的ppp，基座离子温度的空间宽度变得更大。
The effects of toroidal rotation and toroidal field (TF) ripple on the edge pedestal structure and edge-localized-modes (ELMs) were examined in JT-60U. The amplitude of the TF ripple was changed by the installation of ferritic steel tiles (FSTs). The profile of toroidal rotation VT became less counter with FSTs, particularly in the case where co-NBI was used in a large volume configuration. In this case, the plasma pressure was raised across the whole profile of the plasma. At the plasma edge, higher pedestal temperature was obtained with the growth of pedestal width. However, the effect of FSTs became less significant in a small volume configuration. As the VT became less counter at the pedestal, ELM frequency fELM was reduced and ELM energy loss ΔWELM was increased at fixed power crossing the separatrix Psep. The observed larger ELM energy drop at VT in a relatively co-direction involves the ELM perturbations of the electron temperature profile across an ELM that extends radially more inward. In addition, the inter-ELM transport loss is reduced and the pedestal pressure pped is weakly raised. The effect of FSTs appeared clearly in the large volume configuration where pped is raised even at a given VT at the pedestal while pped is not changed by FSTs at the small volume configuration. This suggests that the reduction of the TF ripple, the magnitude of which can affect the VT profile, plays a role in the increasing of pped. For increased pped due to the use of co-NBI and the reduction of TF ripple, the spatial width of the pedestal ion temperature became greater.