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Toroidal torques due to n=1 magnetic perturbations in ITER baseline scenario

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Plasma Science and Technology 2025年第1期27卷 39-51页

作者： Jingwei LI Li LI Yueqiang LIU Yunfeng LIANG Yanfei WANG Lu TIAN Zhongqing LIU Fangchuan ZHONG College of Physics Donghua UniversityShanghai 201620People’s Republic of China Member of magnetic Confinement fusion Research centre Ministry of EducationShanghai 201620People’s Republic of China General Atomics San Diego CA 92186-5608United States of America Institut für Energie-und Klimaforschung–Plasmaphysik Partner of the Trilateral Euregio Cluster(TEC)Forschungszentrum Juülich GmbHJülich 52425Germany

Toroidal torques,generated by the resonant magnetic perturbation(RMP)and acting on the plasma column,are numerically systematically investigated for an ITER baseline *** neoclassical toroidal viscosity(NTV),in particular the resonant portion,is found to provide the dominant contribution to the total toroidal torque under the slow plasma flow regime in *** the electromagnetic torque always opposes the plasma flow,the toroidal torque associated with the Reynolds stress enhances the plasma flow independent of the flow direction.A peculiar double-peak structure for the net NTV torque is robustly computed for ITER,as the toroidal rotation frequency is scanned near the zero *** structure is found to be ultimately due to a non-monotonic behavior of the wave-particle resonance integral(over the particle pitch angle)in the superbanana plateau NTV regime in *** findings are qualitatively insensitive to variations of a range of factors including the wall resistivity,the plasma pedestal flow and the assumed frequency of the rotating RMP field.

关键词： toroidal torques resonant magnetic perturbation fieds plasma flow ITER baseline scenario

Disruption prediction and mitigation strategies in the EHL-2 spherical torus

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Plasma Science and Technology 2025年第02期 148-157页

作者：蔡剑青梁云峰陈忠勇郑玮胡地薛雷林志芳顾翔 the EHL-2 Team Hebei Key Laboratory of Compact fusion Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasmaphysik International Joint Research Laboratory of magnetic Confinement fusion and Plasma Physics School of Electrical and Electronic Engineering Huazhong University of Science and Technology School of Physics Beihang University Southwestern Institute of Physics School of Electrical Engineering & Automation Jiangsu Normal University ENN Science and Technology Development Co. Ltd.

EHL-2 is a compact,high-field spherical tokamak designed to explore the potential of an advanced p-11B nuclear fusion *** to its high plasma current and thermal energy,it is crucial to mitigate the impact associated with disruptions to ensure the safe operation of *** paper evaluates the performance requirements of the disruption prediction system on EHL-2,with a particular focus on applying generalizable knowledge transfer from existing devices to future ***,the key characteristics of disruption mitigation strategies are analyzed,and their overall mitigation performance on EHL-2 is *** insight provides valuable guidance for optimizing the engineering design of EHL-2 and identifying its optimal operational regime.

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Transport Modelling for EAST with LHRF and NBI

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Plasma Science and Technology 2009年第4期11卷 417-421页

作者：周登 Holger St.JOHN 胡业民李国强任启龙欧靖 Institute of Plasma Physics Chinese Academy of Sciences centre for magnetic fusion theory Chinese Academy of Sciences General Atomics

Lower hybrid simulation code （LSC） is integrated into transport code ONETWO to model discharges of EAST with heating and current drive using both lower hybrid wave and neutral beam injection. To test the integration, the current profiles driven by both lower hybrid wave and neutral beam injection are presented for a given equilibrium and sample density and temperature profiles before carrying out a time advancing simulation. For a steady state H-mode discharge, the temperature profiles are evolved using GLF23 transport model with a boundary value specified at the normalized minor radius pN = 0.9. A case of steady state with non-inductively driven current accounting for up to 80% is presented.

关键词： ONETWO LSC EAST modeling

Characterization of fast ion loss in the EHL-2 spherical torus

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Plasma Science and Technology 2025年第02期 29-38页

作者：孙恬恬姜欣辰李直顾翔王雪韵董力立杨丹可李鹏敏王汉清刘硕李颖颖谢华生石跃江梁云峰刘敏胜 the EHL-2 Team Hebei Key Laboratory of Compact fusion ENN Science and Technology Development Co. Ltd. Forschungszentrum Jülich GmbH Institute of Fusion Energy and Nuclear Waste Management-Plasmaphysik

This study analyzes fast ion losses in the EHL-2 fusion device,focusing on both beam ions and alpha particles as p-11B fusion reaction *** the Monte Carlo orbit-following code TGCO,we evaluate particle confinement under various operational scenarios,including coinjected tangential neutral beam injection at beam energies of 60 keV,80 keV,and 200 *** simulations estimate the heat load driven by lost beam ions and find it to be within acceptable material limits for a plasma current on the order of ***,we simulate the distribution of fusion products and observe a higher particle loss fraction for alpha particles compared to beam ***,due to the relatively low fusion power,these lost alpha particles are unlikely to significantly impact the plasma-facing *** assess the impact of the magnetic ripple,we compute the ripple field distribution by modelling the toroidal field（TF） coils as current *** results indicate that the ripple field effect on particle confinement is minimal,primarily due to the large distance of over 1 m between the TF coils and the plasma on the low-field *** analysis based on the test particle model is a foundational step in ensuring the basic safety aspects of the new device,which is essential for developing a robust design,optimizing performance,and maintaining safe operation.

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Nonlinear saturation of reversed shear Alfvén eigenmode via high-frequency quasi-mode generation

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Plasma Science and Technology 2025年第1期27卷 17-22页

作者： Zhiwen CHENG Guangyu WEI Lei YE Zhiyong QIU Institute for fusion theory and Simulation School of PhysicsZhejiang UniversityHangzhou 310027People’s Republic of China CAS Key Laboratory of Frontier Physics in Controlled Nuclear fusion and Institutes of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Center for Nonlinear Plasma Science ENEA C.R.FrascatiFrascati 00044Italy

A nonlinear saturation mechanism for reversed shear Alfvén eigenmode(RSAE)is proposed and analyzed,and is shown to be of relevance to typical reactor parameter *** saturation is achieved through the generation of high-frequency quasi-mode due to nonlinear coupling of two RSAEs,which is then damped due to coupling with the shear Alfvén continuum,and leads to the nonlinear saturation of the primary *** estimation of the nonlinear damping rate is also provided.

关键词： reversed shear Alfvén eigenmode nonlinear mode coupling continuum damping gyrokinetic theory

Numerical analysis of high Mach flow and flow reversal in the experimental advanced superconducting tokamak divertor

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Chinese Physics B 2011年第9期20卷 276-281页

作者：欧靖杨锦宏 Institute of Plasma Physics Chinese Academy of Sciences Center for magnetic fusion theory Chinese Academy of Sciences

The B2-Eirene （SOLPS 4.0） code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer （SOL） flow, in the experimental advanced superconducting tokamak （EAST） divertor. Simulation results show that the SOL flow in the divertor region can exhibit complex behaviour, such as a high Mach flow and flow reversal in different plasma regimes. When the divertor plasma is in the detachment state, the high Mach flow with approaching or exceeding sonic speed is observed away from the target plate in our simulation. When the divertor plasma is in the high recycling ~tate, the flow reversM with a ~mall Mach number （IMI 〈 0.2） is observed near the X-point along the separatrix region. The driving mechanisms for the high Mach flow and the reversed flow are analysed theoretically through momentum and continuity equations, respectively. The profile of the ionization sources is shown to be a possible formation condition causing the complex behaviour of the SOL flow. In addition, the effects of the high Mach flow and the flow reversal on the impurity transport are also discussed in this paper.

关键词： hiuh Mach flow flow reversal ionization source divertor I)lasma

Ideal MHD Stability Prediction and Required Power for EAST Advanced Scenario

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Plasma Science and Technology 2012年第11期14卷 947-952页

作者：陈均杰李国强钱金平刘子奚 Institute of Plasma Physics Chinese Academy of Sciences Center for magnetic fusion theory Chinese Academy of Sciences

The Experimental Advanced Superconducting Tokamak （EAST） is the first fully superconducting tokamak with a D-shaped cross-sectional plasma presently in operation. The ideal magnetohydrodynamic （MHD） stability and required power for the EAST advanced tokamak （AT） scenario with negative central shear and double transport barrier （DTB） are investigated. With the equilibrium code TOQ and stability code GATO, the ideal MHD stability is analyzed. It is shown that a moderate ratio of edge transport barriers＇（ETB） height to internal transport barriers＇（ITBs） height is beneficial to ideal MHD stability. The normalized beta/3N limit is about 2.20 （without wall） and 3.70 （with ideal wall）. With the scaling law of energy confinement time, the required heating power for EAST AT scenario is calculated. The total heating power Pt increases as the toroidal magnetic field BT or the normalized beta βN is increased.

关键词： ideal MHD beta AT ITB ETB

A Self-Consistent Analysis of Impurity Radiation by SOL-PSI Model

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Plasma Science and Technology 2010年第2期12卷 149-155页

作者：金乐朱思铮 Institute of Plasma Physics Chinese Academy of Sciences Center for magnetic fusion theory Chinese Academy of Sciences

A model of scrape-off layer （SOL）-plasma surface interaction （PSI） coupling is pre- sented for divertor operation. This model can treat the interrelation between impurity production and impurity radiation self-consistently. The model is based on a ＇two-point＇ model and a 0-D steady state impurity particle balance model. The fraction of power radiated in SOL is calcu- lated as a function of the line average density. Compared to the former simple coupling model, this model takes into account the wall-produced impurities that are sputtered by charge-exchange （CX） neutrals. A simple retention factor is also added in this model. A comparison with the experiments is made. The simulation results show the same trend upon the plasma density as shown in experiments. Reasonable qualitative agreement is reached between the results by using the model and those from experiments through the adjustment of the fitted factor.

关键词： plasma surface interactions impurities sputtering 'Two-point' model coupled model

Study on Cavity Modes for D(H) Ion Cycloton Range Frequency Heating Scenarios in EAST

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Plasma Science and Technology 2010年第6期12卷 651-656页

作者：杨程朱思铮 Institute of Plasma Physics Chinese Academy of Sciences Center for magnetic fusion theory Chinese Academy of Sciences

For low single-pass absorption of ion cyclotron range frequency （ICRF） wave in the EAST plasma cavity modes are expected to be excited between the low field side （LFS） antenna and the hybrid cut-off layer. The toroidal spectrum for D（H） minority heating scenarios in EAST is modeled by using FELICE （finite elements ion cyclotron emulator）, a full wave code based on plane-stratified geometry. The excitation of cavity modes is studied. The methods for suppressing cavity modes are also discussed, to increase the efficiency of minority ion heating.

关键词： cavity modes ICRF toroidal spectrum FELICE