文献类型：期刊文献

中文题名：托卡马克装置EAST中快离子反常扩散对热输运的影响

英文题名：Effects of Anomalous Fast Ion Diffusion on Heat Transport in EAST Tokamak

作者：赵宇安[1];张先梅[1];虞立敏[1];薛二兵[1];陈卫栋[1]

机构：[1]华东理工大学物理系,上海200237

年份：2019

卷号：45

期号：2

起止页码：351

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

语种：中文

中文关键词：中性束注入加热;快离子反常扩散;热输运

外文关键词：NBI;fast ion anomalous diffusion;heat transport

摘要：研究了EAST装置中性束注入加热等离子体时的快离子扩散行为,并研究了其对等离子体有效热输运系数的影响。通过利用输运代码(TRANSP)程序以及蒙特卡洛代码(NUBEAM)模块对等离子体放电进行模拟,发现当安全因子的最小值qmin接近于2的时候,快离子的扩散是反常的;当qmin约等于1时,快离子扩散符合新经典理论。此外发现当快离子反常扩散时会导致中性束注入(NBI)的加热效率降低,并且等离子体储能以及总加热功率也会发生明显下降,且快离子扩散和电子温度会对等离子体有效热输运系数产生相反影响。该研究结果有助于理解EAST装置在有NBI情况时的快离子反常输运并为实验提供指导。
In this paper,the fast ion transport is studied during neutral beam injection (NBI) on the experimental advanced superconducting tokamak (EAST),and its influence on background plasma effective thermal transport is also investigated.By using the NUBEAM and TRANSP code to simulate the EAST discharge,we found that the fast-ion transport is anomalous when the minimum safety factor (qmin) is about 2,but it is neo-classical when qmin is around 1.Alfvén continuum spectrum and the mode structures of TAEs (toroidal Alfvén-eigenmode) are also calculated for comparison between neo-classical fast-ion transport and anomalous fast-ion transport.High qmin discharge with anomalous fast-ion transport has more AE (Alfvén-eigenmode) activity than that of lower qmin discharge with neoclassical fast-ion transport.Furthermore,NBI heating efficiency,plasma stored energy and the total heating power are decreased when the fast ion transport is anomalous.The fast-ion diffusion coefficient and the electron temperature have the opposite influence on the plasma effective thermal transport coefficient.The plasma effective thermal transport coefficient is larger when the fast-ion diffusion coefficient is bigger,while it is smaller when the electron temperature is bigger.This investigation is helpful to understand the mechanism of the fast-ion anomalous transport during NBI in EAST and to provide guidance for future experiments.