Garching-Greifswald Ringberg Theory Meeting

Slides:

Advertisements

Similar presentations

Some New Data From FRC Experiment on Relaxation For discussions at Hall-Dynamo and Related Physics meeting CMSO June 10-11, 2004 at PPPL Guo et al, PRL.

Advertisements

YQ Liu, Peking University, Feb 16-20, 2009 Resonant Field Amplification Yueqiang Liu UKAEA Culham Science Centre Abingdon, Oxon OX14 3DB, UK.

Short wavelength ion temperature gradient driven instability in toroidal plasmas Zhe Gao, a) H. Sanuki, b) K. Itoh b) and J. Q. Dong c) a) Department of.

Stellarator in a Box: Understanding ITG turbulence in stellarator geometries G. G. Plunk, IPP Greifswald Collaborators: T. Bird, J. Connor, P. Helander,

Evening Talk at EFTC-11 MAGNETIC GEOMETRY, PLASMA PROFILES AND STABILITY J W Connor UKAEA/EURATOM Fusion Association, Culham Science Centre, Abingdon,

West Lake International Symposium on Plasma Simulation; April, 2012 Influence of magnetic configuration on kinetic damping of the resistive wall.

TAE-EP Interaction in ARIES ACT-I K. Ghantous, N.N Gorelenkov PPPL ARIES Project Meeting,, 26 Sept

Magnetic Structures in Electron-scale Reconnection Domain

Alfvénic turbulence at ion kinetic scales Yuriy Voitenko Solar-Terrestrial Centre of Excellence, BIRA-IASB, Brussels, Belgium Recent results obtained in.

Non-Resonant Quasilinear Theory Non-Resonant Theory.

Kinetic Theories of Geodesic Acoustic Modes in Toroidal Plasmas Zhiyong Qiu, F. Zonca and L. Chen IFTS, May 2010.

INTRODUCTION OF WAVE-PARTICLE RESONANCE IN TOKAMAKS J.Q. Dong Southwestern Institute of Physics Chengdu, China International School on Plasma Turbulence.

Discrete Alfven Eigenmodes Shuang-hui Hu College of Sci, Guizhou Univ, Guiyang Liu Chen Dept of Phys & Astr, UC Irvine Supported by DOE and NSF.

Alfvén-cyclotron wave mode structure: linear and nonlinear behavior J. A. Araneda 1, H. Astudillo 1, and E. Marsch 2 1 Departamento de Física, Universidad.

Fast ion effects on fishbones and n=1 kinks in JET simulated by a non-perturbative NOVA-KN code TH/5-2Rb N.N. Gorelenkov 1), C.Z.Cheng 1), V.G. Kiptily.

Hybrid Simulation of Ion-Cyclotron Turbulence Induced by Artificial Plasma Cloud in the Magnetosphere W. Scales, J. Wang, C. Chang Center for Space Science.

Francesco Valentini, Pierluigi Veltri Dipartimento di Fisica, Università degli Studi della Calabria (Italy) Dipartimento di Fisica, Università degli Studi.

Assessment of Quasi-Helically Symmetric Configurations as Candidate for Compact Stellarator Reactors Long-Poe Ku Princeton Plasma Physics Laboratory Aries.

TH/3-1Ra Nonperturbative Effects of Energetic Ions on Alfvén Eigenmodes by Y. Todo et al. EX/5-4Rb Configuration Dependence of Energetic Ion Driven Alfven.

The Stability of Internal Transport Barriers to MHD Ballooning Modes and Drift Waves: a Formalism for Low Magnetic Shear and for Velocity Shear The Stability.

Finite Temperature Effects on VLF-Induced Precipitation Praj Kulkarni, U.S. Inan and T. F. Bell MURI Review February 18, 2009.

Incorporating Kinetic Effects into Global Models of the Solar Wind Steven R. Cranmer Harvard-Smithsonian Center for Astrophysics.

Nonlinear Frequency Chirping of Alfven Eigenmode in Toroidal Plasmas Huasen Zhang 1,2 1 Fusion Simulation Center, Peking University, Beijing , China.

Kinetic Effects on the Linear and Nonlinear Stability Properties of Field- Reversed Configurations E. V. Belova PPPL 2003 APS DPP Meeting, October 2003.

J A Snipes, 6 th ITPA MHD Topical Group Meeting, Tarragona, Spain 4 – 6 July 2005 TAE Damping Rates on Alcator C-Mod Compared with Nova-K J A Snipes *,

The Role of Damping in Stable and Unstable Alfvén Eigenmodes S. D. Pinches 1, A. Könies 2, Ph. Lauber 1 H.L.Berk 3, S.E.Sharapov 4 and M.Gryaznavich 4.

Excitation of ion temperature gradient and trapped electron modes in HL-2A tokamak The 3 th Annual Workshop on Fusion Simulation and Theory, Hefei, March.

Stability Properties of Field-Reversed Configurations (FRC) E. V. Belova PPPL 2003 International Sherwood Fusion Theory Conference Corpus Christi, TX,

BGU WISAP Spectral and Algebraic Instabilities in Thin Keplerian Disks: I – Linear Theory Edward Liverts Michael Mond Yuri Shtemler.

Reconnection rates in Hall MHD and Collisionless plasmas

Dynamics of ITG driven turbulence in the presence of a large spatial scale vortex flow Zheng-Xiong Wang, 1 J. Q. Li, 1 J. Q. Dong, 2 and Y. Kishimoto 1.

1 Three views on Landau damping A. Burov AD Talk, July 27, 2010.

Nonlinear interactions between micro-turbulence and macro-scale MHD A. Ishizawa, N. Nakajima, M. Okamoto, J. Ramos* National Institute for Fusion Science.

1 Confinement Studies on TJ-II Stellarator with OH Induced Current F. Castejón, D. López-Bruna, T. Estrada, J. Romero and E. Ascasíbar Laboratorio Nacional.

Electron inertial effects & particle acceleration at magnetic X-points Presented by K G McClements 1 Other contributors: A Thyagaraja 1, B Hamilton 2,

Kinetic MHD Simulation in Tokamaks H. Naitou, J.-N. Leboeuf †, H. Nagahara, T. Kobayashi, M. Yagi ‡, T. Matsumoto*, S. Tokuda* Joint Meeting of US-Japan.

Simulation Study of Magnetic Reconnection in the Magnetotail and Solar Corona Zhi-Wei Ma Zhejiang University & Institute of Plasma Physics Beijing,

Effects of Flow on Radial Electric Fields Shaojie Wang Department of Physics, Fudan University Institute of Plasma Physics, Chinese Academy of Sciences.

Weakly Collisional Landau Damping and BGK Modes: New Results on Old Problems A. Bhattacharjee, C. S. Ng, and F. Skiff Space Science Center University of.

FEC 2006 Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX J.M. Canik 1, D.L. Brower.

1 Stability Studies Plans (FY11) E. Fredrickson, For the NCSX Team NCSX Research Forum Dec. 7, 2006 NCSX.

Alfven Waves in Toroidal Plasmas

The influence of non-resonant perturbation fields: Modelling results and Proposals for TEXTOR experiments S. Günter, V. Igochine, K. Lackner, Q. Yu IPP.

Summary of IAEA Theory Papers on Energetic Particle Physics Guoyong Fu.

Simulations of NBI-driven Global Alfven Eigenmodes in NSTX E. V. Belova, N. N. Gorelenkov, C. Z. Cheng (PPPL) NSTX Results Forum, PPPL July 2006 Motivation:

1 Magnetic components existing in geodesic acoustic modes Deng Zhou Institute of Plasma Physics, Chinese Academy of Sciences.

Flows and Cycles Large scale flows and stellar magnetic cycles Markus Roth Wiebke Herzberg René Kiefer Ariane Schad Guy Davis (UoB) Retreat of the Stellar.

Neoclassical Effects in the Theory of Magnetic Islands: Neoclassical Tearing Modes and more A. Smolyakov* University of Saskatchewan, Saskatoon, Canada,

Ergodic heat transport analysis in non-aligned coordinate systems S. Günter, K. Lackner, Q. Yu IPP Garching Problems with non-aligned coordinates? Description.

Helically Symmetry Configuration Evidence for Alfvénic Fluctuations in Quasi-Helically Symmetric HSX Plasmas C. Deng and D.L. Brower, University of California,

Interaction between vortex flow and microturbulence Zheng-Xiong Wang （王正汹） Dalian University of Technology, Dalian, China West Lake International Symposium.

Plasma Turbulence in the HSX Stellarator Experiment and Probes C. Lechte, W. Guttenfelder, K. Likin, J.N. Talmadge, D.T. Anderson HSX Plasma Laboratory,

Nonlinear plasma-wave interactions in ion cyclotron range of frequency N Xiang, C. Y Gan, J. L. Chen, D. Zhou Institute of plasma phsycis, CAS, Hefei J.

Energetic ion excited long-lasting “sword” modes in tokamak plasmas with low magnetic shear Speaker:RuiBin Zhang Advisor:Xiaogang Wang School of Physics,

54 th APS-DPP Annual Meeting, October 29 - November 2, 2012, Providence, RI Study of ICRH and Ion Confinement in the HSX Stellarator K. M. Likin, S. Murakami.

FPT Discussions on Current Research Topics Z. Lin University of California, Irvine, California 92697, USA.

Influence of pressure-gradient and average- shear on ballooning stability semi-analytic expression for ballooning growth rate S.R.Hudson 1, C.C.Hegna 2,

U NIVERSITY OF S CIENCE AND T ECHNOLOGY OF C HINA Influence of ion orbit width on threshold of neoclassical tearing modes Huishan Cai 1, Ding Li 2, Jintao.

Kinetic Effects on Slowly Rotating Magnetic Islands in Tokamaks

Collective Excitations in QCD Plasma

Reduction of Neoclassical Transport and Observation of a Fast Electron Driven Instability with Quasisymmetry in HSX J.M. Canik1, D.L. Brower2, C. Deng2,

Huishan Cai, Jintao Cao, Ding Li

8th IAEA Technical Meeting on

Spectral and Algebraic Instabilities in Thin Keplerian Disks: I – Linear Theory Edward Liverts Michael Mond Yuri Shtemler.

E3D: status report and application to DIII-D

Gyrofluid Turbulence Modeling of the Linear

Influence of energetic ions on neoclassical tearing modes

Sathya Sai Seetharaman, Ian R. Hooper, William L. Barnes

Resonance properties of metallic ring systems: A rigorous approach

Electron Acoustic Waves (EAW) EAW’s are novel kinetic waves that exist only because nonlinear trapping turns off Landau damping. We recently provided.

Presentation transcript:

Garching-Greifswald Ringberg Theory Meeting 17 November 2008 Compressional and Kinetic Effects on the Lowest Part of the Alfvén Spectrum in Stellarators with Weak Shear D. Eremin, A. Könies Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald

Outline Motivation Case study: unstable Alfvénic mode in quasisymmetric HSX MHD Analysis: coupling of the Alfvén and acoustic modes Kinetic Effects: parallel electric field Further Work Conclusions

Motivation Low-frequency electromagnetic activity in experiment, often no adequate explanation within the purely shear Alfvén physics Direct analysis of the numerical data for stellarators can be extremely complicated. Reduced models needed Alfvén modes can couple with acoustic modes through the curvature of magnetic field lines leading to modified continua (e.g., beta-induced gaps) and new eigenmodes The mode with the helicity close to the rotational transform is particularly sensitive to the interaction with acoustic modes as it has very low frequency Kinetic effects, such as the parallel electric field, are an essential part of the problem Motivation

Electromagnetic activity in W7-AS (Hirsch et al, PPCF 2008) Motivation

Unstable low-frequency mode in HSX HSX Quasisymmetric Stellarator Alfvén continuum (CONTI) (Brower et al, 2005) (A. Könies) Motivation

Quasisymmetric operation in HSX Case Study: HSX

MHD analysis: basic assumptions

Basic equations (MHD) MHD Analysis

Continuous spectra MHD Analysis

Coupling to the acoustic modes Alfvén acoustic geodesic -acoustic modified Alfvén-acoustic continuous spectra unmodified Alfvén unmodified acoustic modified Alfvén-acoustic MHD Analysis

Coupling to other Alfvén modes MHD Analysis

Quasisymmetric configuration in HSX Case Study: HSX

Modified continua: HSX Case calculated with CONTI: Continua calculated with the reduced formula: MHD Analysis

Modified continua: W7-AS Case MHD Analysis

Eigenmode equation (MHD) MHD Analysis

Acoustic resonance MHD Analysis

Eigenvalue code MHD Analysis

Beta-induced gap mode (MHD) MHD Analysis

Beta-induced gap mode (analysis) MHD Analysis

Kinetic effects: parallel electric field

Weakly damped kinetic modes Kinetic Effects

Heavily damped kinetic modes

To do Investigate damping vs magnitude of the magnetic field strength Fourier harmonics Conduct analytical research as to why there are undamped modes despite the strong parallel Landau damping in the kinetic case Study dependence of the continuum damping on the acoustic branches separation Study interaction of Alfvén and acoustic modes in W7-X and W7-AS New physics: - more dominant harmonics of the field strength than in HSX - large ion damping in isothermal plasmas - finite Larmor radius effects Further Work

Conclusions A reduced model for treatment of the coupled Alfvén-acoustic modes in low part of the frequency spectrum is derived Case of the Alfvénic mode with helicity close to the rotational transform as an example of such mode is studied for HSX parameters Alfvén continuum exhibits drastic change of topology as long at the locations where the acoustic frequencies and the Alfvén continuum cross. A gap and a “crossing continuum” are formed MHD eigenfunctions have global character and seem to have no continuum damping Kinetic effects lead to generation of KAWs, which significantly enhances damping of the global gap mode Present research provides a knowledge base for exploring more sophisticated stellarators, such as W7-AS or W7-X