EAST H 模放电平衡和不平衡旋转的新古典验证

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Cheonho Bae, Yifei Jin, Bo Lyu, Baolong Hao, Yingying Li, Xinjun Zhang, Haiqing Liu, Hongming Zhang, Fudi Wang, Jia Fu, Jing Fu, Juan Huang, Long Zeng, Qing Zang, Yichao Li, Liang He, Dian Lu
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引用次数: 0

摘要

预测残余应力(RS)对本征旋转的贡献是托卡马克动量传输研究的主要挑战之一。量化 RS 扭矩大小的一种有效实验方法是利用反向对中性束注入(NBI)生成径向平坦且接近零的旋转剖面,在本文中称为 "平衡旋转",以有效抵消来自共对中性束注入的扭矩。然而,剩下的一个问题是,所获得的速度曲线是否足够零化和平坦,以便基于完全平衡假设预测的 RS 扭矩可用于进一步研究,例如拟合扩散和对流系数,使其与实验相匹配。本文利用 TRANSP/NUBEAM 和最近开发的新古典旋转/传输代码 TransROTA(Bae 等,2024 年,Comput.)对平衡和不平衡 EAST H 模式放电进行分析后发现,建议的新古典验证方法成功地验证了获得的平衡旋转。研究还发现,新古典旋回转矩(NGV)是轴对称等离子体的平衡打破机制,平衡打破从核心开始,向边缘传播。这项工作还提出了使用新古典方法在接近 ∼20 km s-1 的高速范围内寻找局部平衡旋转的可能性,这意味着 RS 扭矩可能会在一定的高速范围内缩放。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A neoclassical validation of balanced and unbalanced rotations on EAST H-mode discharges
Predicting residual stress (RS) contribution to intrinsic rotation is one of the major challenges in the study of momentum transport in tokamaks. One efficient experimental means of quantifying RS torque magnitude is to generate radially-flat and near-zero rotation profiles, termed ‘balanced rotations’ in this work, using counter-Ip Neutral Beam Injections (NBIs) to effectively cancel the torques from co-Ip NBIs. One remaining question, however, is on whether or not the attained velocity profile is well zeroed and flat enough so that the predicted RS torques based on perfect balance assumption can be used for further studies such as fitting of diffusive and convective coefficients to match with experiments. This article presents a neoclassical means of validating the attained balanced and unbalanced rotations at EAST to consequently validate the predicted RS torque profiles, using TRANSP/NUBEAM and a recently-developed neoclassical rotation/transport code TransROTA (Bae et al 2024 Comput. Phys. Commun. 296 108992). Both balanced and unbalanced EAST H-mode discharges are analyzed to find that the suggested neoclassical validation methodology successfully validates attained balanced rotations. It also finds that neoclassical gyroviscous (NGV) torque serves as the balance-breaking mechanism for axisymmetric plasmas and the balance-breakings start from the core and propagate towards the edge. This work also suggests the possibility of using the neoclassical methodology to find locally-balanced rotations at an elevated velocity range near ∼20 km s−1, which implies possible scaling of RS torques up to a certain elevated velocity range.
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
期刊介绍: Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.
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