Results 91 to 100 of about 20,493 (125)

The magnetic coherent mode with shifted Alfvén gap frequency destabilized by the thermal trapped electron resonance in the pedestal of high-confinement tokamak plasmas

Nuclear Fusion
The magnetic coherent modes (MCM) with toroidal mode number n about 1 (Chen R. et al 2018 Nucl. Fusion 58 112004) frequently appear in the edge pedestal of high-confinement tokamak plasmas on EAST in the absence of energetic particles.
Xingquan Wu (伍兴权), Guosheng Xu (徐国盛), Ran Chen (陈冉), Baonian Wan (万宝年)   +3 more
doaj   +1 more source

Axisymmetric perturbations and vertical displacement oscillatory modes driven by fast ions in tokamak plasmas

Nuclear Fusion
Recent progress on the theory and numerical simulations of vertical displacement oscillatory modes (VDOM) in tokamak plasmas is reported. VDOM are driven unstable by energetic particles and can have an impact on plasma disruptions, plasma edge stability ...
F. Porcelli, D. Banerjee, S. Cavallero, T. Barberis, F. Qiu, A. Yolbarsop, L.-G. Eriksson, C.C. Kim   +7 more
doaj   +1 more source

Excitation of beta Alfvén eigenmodes in Tore-Supra

, 2009
Modes oscillating at the acoustic frequency and identified as beta Alfvén eigenmodes (BAEs) have been observed in Tore-Supra under ion cyclotron resonant heating.
Elbèze, D., Nguyen, C., Basiuk, V., Decker, J., Schneider, M.M., Eriksson, L.-G., Ségui, J.-L., Goniche, M., Garbet, X., Macor, A., Huysmans, G.T.A., Sabot, R., Maget, P., X Garbet, A Macor, V Basiuk, C Nguyen, R Sabot, L-G Eriksson, M Goniche, M Schneider, J-L Ségui, D Elbèze, G T A Huysmans, J Decker, P Maget   +25 more
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Exact Nonlinear Decomposition of Ideal-MHD Waves Using Eigenenergies. II. Fully Analytical Equations and Pseudoadvective Eigenenergies

The Astrophysical Journal
Physical insight into plasma evolution in the magnetohydrodynamic (MHD) limit can be revealed by decomposing the evolution according to the characteristic modes of the system. In this paper we explore aspects of the eigenenergy decomposition method (EEDM)
Axel Raboonik, David I. Pontin, Lucas A. Tarr   +2 more
doaj   +1 more source

Bursting core-localized ellipticity-induced Alfvén eigenmodes driven by energetic electrons during EAST ohmic discharges

Nuclear Fusion
A series of high-frequency ( $400\sim1000{\text{ kHz}}$ ) bursting core-localized Alfvén instabilities have been observed during ohmic discharges in EAST tokamak. The instability trigger favours the discharge conditions of low toroidal magnetic field and
P. Su, H. Lan, C. Zhou, J. Bao, A. Liu, X. Zhu, M. Wu, C. Luo, J. Han, J. Wang, H. Liu, T. Zhang, R. Zhou, S. Lin, H. Zhao, Y. Sun, Z. Qiu, N. Chu, T. Tang, Y. Tan, L. Zeng, Z. Gao   +21 more
doaj   +1 more source

Comprehensive simulations of bursting and non-bursting shear Alfvén waves in ICRF heated tokamak plasmas

Nuclear Fusion
This work reports the first comprehensive simulations of ion cyclotron resonance heating (ICRH) driven tokamak plasmas on the slowing-down timescale using the kinetic-MHD hybrid code MEGA, where shear Alfvén wave induced minority ion transport is self ...
J. Wang, Y. Todo, R. Seki, A. Bierwage, N. Tsujii, Z. Cheng, Z.X. Wang, K. Ogawa, Wang H., M. Sato, J. Han, S. Wei, H. Li, T. Nagai   +13 more
doaj   +1 more source

Measurement of toroidal Alfvén eigenmode-driven fast-ion flows using an imaging neutral particle analyzer at ASDEX Upgrade

Nuclear Fusion
Alfvén Eigenmodes-driven fast-ion flows have been measured for the first time at the ASDEX Upgrade tokamak using an imaging neutral particle analyzer.
J. Rueda-Rueda, M. Garcia-Munoz, E. Viezzer, P.A. Schneider, J. Galdon-Quiroga, J. Garcia-Dominguez, P. Oyola, L. Velarde, J. Hidalgo-Salaverri, X. Du, M.A. Van Zeeland, M. Videla-Trevin, J. Gonzalez-Martin, Ph. Lauber, T. Lunt, A. Herrmann, J. Ayllon-Guerola, the ASDEX Upgrade Team   +17 more
doaj   +1 more source

β-induced Alfvén eigenmodes and fishbone driven by energetic electrons in EAST electron heating dominant plasmas

Nuclear Fusion
β-induced Alfvén eigenmodes (e-BAE) and fishbone (e-fishbone) driven by the energetic electrons have been identified on the experimental advanced superconducting tokamak in electron cyclotron resonance heating (ECRH), low hybrid wave (LHW) together with ...
Y. Chao, L.Q. Xu, C.W. Mai, M.Q. Wu, Y.M. Duan, S.Y. Lin, K.N Geng, C. Zhou, L.Q. Hu   +8 more
doaj   +1 more source

Toroidal Alfvén eigenmodes excited by energetic electrons in EAST low-density ohmic plasmas

Nuclear Fusion
Operation in the quiescent regime with abundant trapped energetic electrons (EEs) has been achieved during the current flattop in EAST low-density Ohmic plasmas.
Xiang Zhu, Zhiyong Qiu, Jian Bao, Tao Zhang, Haiqing Liu, Chenxi Luo, Tian Tang, Tonghui Shi, Dalong Chen, Jinping Qian, Xiaodong Lin, Xiang Gao, Xianzu Gong, Shiyao Lin, Long Zeng   +14 more
doaj   +1 more source

FOXTAIL: Modeling the nonlinear interaction between Alfvén eigenmodes and energetic particles in tokamaks [Elektronisk resurs]

, 2016
FOXTAIL is a new hybrid magnetohydrodynamic-kinetic code used to describe interactions between energetic particles and Alfvén eigenmodes in tokamaks with realistic geometries.
Johnson, Thomas,, Tholerus, Emmi,, Hellsten, Torbjörn,   +2 more
core