J-TEXT托卡马克锯齿周期及热输运分析  

Sawtooth Period and Heat Transport Analysis on J-TEXT Tokamak

作　　者：张锦钰 赵开君 谢耀禹 向林 杨宇 ZHANG Jinyu;ZHAO Kaijun;XIE Yaoyu;XIANG Lin;YANG Yu(School of Nuclear Science and Engineer,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核科学与工程学院,南昌330013

出　　处：《能源研究与管理》2023年第1期88-94,共7页Energy Research and Management

基　　金：国家自然科学基金项目(12075057,11875020);创新群体项目(51821005);江西省自然科学基金项目(20202ACBL201002)。

摘　　要：研究锯齿振荡现象旨在控制托卡马克等离子体的约束和输运。基于导数法寻峰,设计了采用条件平均方法分析处理锯齿振荡信号的程序。统计分析了J-TEXT装置上不同放电条件下锯齿振荡周期。结果表明锯齿振荡周期与电子密度之间呈线性关系,且振荡周期随密度的增加而增加,进一步分析表明锯齿振荡周期也可能与边界安全因子相关。采用该方法及time-to-peak方法估算出不同电子密度时的电子热输运系数,随着电子密度的升高,锯齿热脉冲引起的电子热输运系数降低。相较于传统方法,采用条件平均方法估算锯齿周期以及热脉冲引起的电子热输运系数更准确。The study of the sawtooth oscillation phenomenon aims to control plasma confinement and transport in tokamaks.Based on the derivative peak finding method,a code is written to analyze the sawtooth oscillation signal using the conditional average method.The sawtooth oscillation periods under various discharge conditions on the J-TEXT device were statistically analyzed.The result shows a linear relationship between the sawtooth oscillation period and the electron density,and the oscillation period increases with the density.Further analysis shows that the sawtooth oscillation period may also be related to the edge safety factor.Combing this method and the time-to-peak method,the electron thermal diffusivity is estimated at various densities.As the density increases,the electron thermal diffusivity caused by the sawtooth heat pulse decreases.Compared to the traditional methods,the evaluations of the sawtooth period and the thermal diffusivity induced by heat pulses are more accurate using the conditional average method.

关 键 词：托卡马克 锯齿振荡 条件平均法 热输运 软X射线 

分 类 号：TL631.24[核科学技术—核技术及应用]