首页|Impact of Ti/Te ratio on ion transport based on EAST H-mode plasmas

Impact of Ti/Te ratio on ion transport based on EAST H-mode plasmas

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At the EAST tokamak,the ion temperature(Ti)is observed to be clamped around 1.25 keV in electron cyclotron resonance(ECR)-heated plasmas,even at core electron temperatures up to 10 keV(depending on the ECR heating power and the plasma density).This clamping results from the lack of direct ion heating and high levels of turbulence-driven transport.Turbulent transport analysis shows that trapped electron mode and electron temperature gradient-driven modes are the most unstable modes in the core of ECR-heated H-mode plasmas.Nevertheless,recently it was found that the Ti/Te ratio can increase further with the fraction of the neutral beam injection(NBI)power,which leads to a higher core ion temperature(Ti0).In NBI heating-dominant H-mode plasmas,the ion temperature gradient-driven modes become the most unstable modes.Furthermore,a strong and broad internal transport barrier(ITB)can form at the plasma core in high-power NBI-heated H-mode plasmas when the Ti/Te ratio approaches～1,which results in steep core Te and Ti profiles,as well as a peaked ne profile.Power balance analysis shows a weaker Te profile stiffness after the formation of ITBs in the core plasma region,where Ti clamping is broken,and the core Ti can increase further above 2 keV,which is 80％higher than the value of Ti clamping in ECR-heated plasmas.This finding proposes a possible solution to the problem of Ti clamping on EAST and demonstrates an advanced operational regime with the formation of a strong and broad ITB for future fusion plasmas dominated by electron heating.

ion temperature clampingtransportneutral beam injectionstiffnessinternal transport barrier

刘建文、臧庆、梁云峰、陈佳乐、邬潇河、Alexander KNIEPS、扈嘉辉、金仡飞、张斌、储宇奇、刘海庆、吕波、段艳敏、李妙辉、陈颖杰、龚先祖、the EAST Team

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Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

University of Science and Technology of China,Hefei 230026,People's Republic of China

Forschungszentrum Jülich GmbH,Institut für Energie-und Klimaforschung-Plasmaphysik,Partner of the Trilateral Euregio Cluster(TEC),Jülich 52425,Germany

国家自然科学基金Users with Excellence Program of Hefei Science Center,CAS国家重点研发计划Major Science and Technology Infrastructure Maintenance and Reconstruction Projects of the Chinese Academy of Sciences(2021)Special Funds for Improving Conditions for Scientific Research in National Scientific Institutions(2022)国家留学基金委项目ShenMa High Performance Computing Cluster in the Institute of Plasma Physics,Chinese Academy of Sciences

121350152021HSC-UE0122022Y FE03010003

2024

10.1088/2058-6272/ad1195

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(4)
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