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f.shbone Instability Excited by Barely Trapped Electrons

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Southwestern Institute of Physics Annual Report

Southwestern Institute of.Physics Annual Report 2006年第1期 113-115页

作者： WANG Zhongtian LONG Yongxing DONG Jiaqi WANG Long zonca f. 不详 Institute of.Physics Chinese Academy of Sciences Beijing 100080 China Associazione EURATOM-ENEA Sulla Fusione C.P. 65-00044 Frascati Rome Italy

1 Introduction Internal kink mode driven by barely trapped suprakthermal electrons is reported on D Ⅲ-D tokama . This instability is most active when electron cyclotron current drive （ ECCD ） is applied on the high f.eld side of.the f.ux surf.ce. It has a bursting behavior with poloidal/toroidal mode number m/n = 1/1. In positive magnetic shear plasma this mode becomes f.shbone instability.

关键词：电子核反应装置核物理学回旋加速器

Simulation of.ECCD and ECRH f.r SUNIST

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Southwestern Institute of Physics Annual Report

Southwestern Institute of.Physics Annual Report 2006年第1期 130-132页

作者： WANG Zhongtian LONG Yongxing DONG Jiaqi HE Zhixiong zonca f. f. G. Y. 不详 Associazione EURATOM-ENEA Sulla Fusione C.E 65-00044 Frascati Rome Italy Plasma Physics Laboratory Princeton University Princeton New Jersey 08543 USA

1 Introduction Interaction of.radio-f.equency wave with plasma in magnetic conf.nement devices has been a very important discipline of.plasma physics. To approach more realistic description of.wave-plasma interaction in a time scale longer than the kinetic time scales bounce-average is needed. The long time evolution of.the kinetic distribution can be treated by f.kker-Planck equation. The behavior of.the plasma and the most interesting macroscopic ef.ects are obtained by balancing the dif.usion term with a collision term.

关键词：等离子体核技术交互作用电子磁场

Self.consistent kinetic theory with nonlinear wave-particle resonances

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Plasma Science and Technology 2019年第12期21卷 6-12页

作者： Liu CHEN f.lvio zonca Institute f.r f.sion Theory and Simulation and Department of.Physics Zhejiang UniversityHangzhou 310027People's Republic of China Department of.Physics and Astronomy University of CaliforniaIrvineCA 92697-4575United States of America ENEA C.R.FrascatiVia E.Fermi 45I-00044 Frascati(Rome)Italy

We have developed, based on the oscillating-center transf.rmation, a general theoretical approach f.r self.consistent plasma dynamics including, explicitly, ef.ects of.nonlinear(higherorder) wave-particle resonances. A specif.c example is then given f.r low-f.equency responses of.trapped particles in axisymmetric tokamaks. Possible applications to transport as well as nonlinear wave growth/damping are also brief.y discussed.

关键词： gyrokinetics nonlinear phenomena:waves wave propagation and other interactions

Unexpanded nonlinear electromagnetic gyrokinetic equations f.r magnetized plasmas

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Plasma Science and Technology 2020年第10期22卷 1-4页

作者： Liu CHEN f.lvio zonca Haotian CHEN Institute f.r f.sion Theory and Simulation and Department of.Physics Zhejiang UniversityHangzhou 310027People’s Republic of China Department of.Physics and Astronomy University of CaliforniaIrvineCA 92697United States of America ENEA Fusion and Nuclear Safety DepartmentC.R.FrascatiVia E.Fermi 4500044 Frascati(Roma)Italy Institute of.Space Science and Technology Nanchang UniversityNanchang 330031.People's Republic of China

Nonlinear electromagnetic gyrokinetic equations have been constructed without expanding the f.eld variables into background and f.nite but small-amplitude f.uctuating components. At the long-wavelength limit, these unexpanded nonlinear gyrokinetic equations recover the wellknown drif.-kinetic equations. At the expanded limit, they recover the usual nonlinear gyrokinetic equations. These equations can theref.re be applied to long-term simulations covering f.om microscopic to macroscopic spatial scales.

关键词： gyrokinetic theory plasma turbulence nonlinear phenomena

Kinetic theory of.geodesic acoustic modes in toroidal plasmas:a brief.review

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Plasma Science and Technology 2018年第9期20卷 24-49页

作者： Zhiyong QIU Liu CHEN f.lvio zonca Institute f.r f.sion Theory and Simulation and Department of.Physics Zhejiang University Department of.Physics and Astronomy University of California ENEA Fusion and Nuclear Safety Department

Geodesic acoustic modes（GAM） are oscillating zonal structures unique to toroidal plasmas,and have been extensively studied in the past decades due to their potential capabilities of.regulating microscopic turbulences and associated anomalous *** article reviews linear and nonlinear theories of.GAM;with emphases on kinetic treatment,system nonunif.rmity and realistic magnetic geometry,in order to ref.ect the realistic experimental ***,in the linear physics,the resonant wave-particle interactions are discussed,with the application to resonant excitation by energetic particles（EPs）.The theory of.EP-induced GAM（EGAM） is applied to realistic devices f.r the interpretation of.experimental observations,and global ef.ects due to coupling to GAM continuum are also ***,in the nonlinear physics,the spontaneous GAM excitation by microscale turbulences is reviewed,including the ef.ects of.various system nonunif.rmities.A unif.ed theoretical f.amework of.GAM/EGAM is then constructed based on our present *** f.rst-principle-based GAM/EGAM theories reviewed here,thus,provide the tools needed f.r the understanding and interpretation of.experimental/numerical results.

关键词： geodesic acoustic mode kinetic theory nonlinear physics energetic particle physics

Theoretical and numerical studies of.chorus waves: A review

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Science China Earth Sciences 2020年第1期63卷 78-92页

作者： Xin TAO f.lvio zonca Liu CHEN Yif.n WU CAS Key Laboratory of.Geospace Environment Department of Geophysics and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Center f.r Excellence in Comparative Planetology Hefei 230026China ENEA Centro Ricerche f.ascati CP 65-00044 FrascatiItaly Institute of.f.sion Theory and Simulation and Department of.Physics Zhejiang UniversityHangzhou 310027China Department of.Physics and Astronomy University of CaliforniaIrvineCA 92697USA

Theoretical and numerical models of.chorus waves are reviewed in this paper. Specif.cally, we f.cus on the nonlinear wave particle interactions and the current understanding of.the f.equency chirping of.rising tone chorus waves. Various other related topics, such as the optimal excitation condition of.chorus, the f.rmation of.subpackets, and the non-adiabaticity of.the nonlinear interaction are also discussed. We end this review paper with a short list of.questions of.chorus waves that are still under research and debate.

关键词： Chorus waves f.equency chirping Triggered emissions

Kinetic Theories of.Geodesic Acoustic Modes：Radial Structure,Linear Excitation by Energetic Particles and Nonlinear Saturation＇

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Plasma Science and Technology 2011年第3期13卷 257-266页

作者： QIU Zhiyong(仇志勇) f.lvio zonca CHEN Liu(陈骝) Institute f.r f.sion Theory and Simulation Zhejiang UniversityHangzhou 310027China Associazione Euratom=ENEA sulla f.sione C. P. 65 -I-00044-Frascati. Italy Dept. of.Physics and Astronomy Univ. of California Irvine CA 92697-4575 USA

Geodesic acoustic modes（GAMs）are oscillating zonal mode structures unique to toroidal plasmas and are capable of.regulating microscopic turbulence and associated ***,three important aspects of.GAM dynamics are investigated,namely（1） GAM continuous spectrum and its mode conversion to kinetic GAM （KGAM）;（2） 1inear excitation of.energetic particle induced GAM （EGAM） and its coupling to the GAM continuum, and （3） nonlinear ***

关键词： geodesic acoustic mode continuum energetic particles wave particle trapping

A Gyrokinetic simulation model f.r low f.equency electromagnetic f.uctuations in magnetized plasmas

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Science China(Physics,Mechanics & Astronomy) 2021年第4期64卷 90-95页

作者： Liu Chen HaoTian Chen f.lvio zonca Yu Lin Institute f.r f.sion Theory and Simulation and Department of.Physics Zhejiang UniversityHangzhou 310027China Department of.Physics and Astronomy University of CaliforniaIrvineCalifornia 92697USA Institute of.Space Science and Technology Nanchang UniversityNanchang 330031China Center f.r Nonlinear Plasma Science and C.R.ENEA f.ascati-C.P.65 Frascati 00044Italy Physics Department Auburn UniversityAuburn AL 36849USA

We present a new model f.r simulating the electromagnetic f.uctuations with f.equencies much lower than the ion cyclotron f.equency in plasmas conf.ned in general magnetic *** novel model(termed as GK-E&B)employs nonlinear gyrokinetic equations f.rmulated in terms of.electromagnetic f.elds along with momentum balance equations f.r solving ***,thus,not only includes kinetic ef.ects,such as wave-particle interaction and microscopic(ion Larmor radius scale)physics;but also is computationally more ef.icient than the conventional f.rmulation described in terms of.*** a benchmark,we perf.rm linear as well as nonlinear simulations of.the kinetic Alf.én wave;demonstrating physics in agreement with the analytical theories.

关键词： plasma kinetic equations Gyrokinetics Gyrokinetic simulations particle orbit and trajectory

Magnetic f.eld Gradient and Curvature-Driven Drif. Modes in Toroidal Plasmas

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Chinese Physics Letters 2004年第8期21卷 1575-1577页

作者：王爱科 H.Sanuki 董家齐 f.zonca K.Itoh SouthwesternInstituteof.hysics POBox432Chengdu610041 NationalInstitutef.rf.sionScience TokiGifu509-5292Japan ENEAC.R.f.ascati C.P.6500044FrascatiRomeItaly

A new kind of.instability driven by the magnetic f.eld gradient and curvature (Mf.C) in toroidal plasmas is presented. It is f.und that the Mf.C drif. modes possess f.nite growth rates even if.the plasma pressure gradient vanishes. In addition, the ef.ects of.plasma pressure gradient and saf.ty f.ctor on the Mf.C modes have been analysed numerically.

关键词： Plasma physics