Results 71 to 80 of about 20,493 (125)

Reduced model analysis of supercritical and subcritical chirping Alfvén eigenmodes

, 2009
International audienceWe present a new method for analyzing fundamental kinetic plasma parameters such as the linear drive and the external damping rate based on experimental observations of chirping Alfvén Eigenmodes (AEs).
Idomura, Y., Garbet, Xavier, Lesur, Maxime, Shinohara, K.   +3 more
core   +2 more sources

Radial phase variation and energy flow of Alfvén gap modes

Nuclear Fusion
Radially curved mode structures of Alfvén eigenmodes are commonly observed in fusion experiments associated with energy transport, which indicate the radial phase variation arising from non-ideal magnetohydrodynamics (MHD) and global effects.
X.R. Xu, J. Bao, W.L. Zhang, C. Dong, J.T. Cao, D. Li   +5 more
doaj   +1 more source

Fast ion profile stiffness due to the resonance overlap of multiple Alfvén eigenmodes [PDF]

, 2016
0000-0001-9323-8285Fast ion pressure profiles flattened by multiple Alfvén eigenmodes (AEs) are investigated for various neutral beam deposition powers in a multi-phase simulation, which is a combination of classical simulation and hybrid simulation for ...
Heidbrink, WW, Todo, Y, Van Zeeland, MA, Heidbrink, W.W., Zeeland, M.A. Van, TODO, Yasushi   +5 more
core   +1 more source

Radiative damping of toroidal Alfvén eigenmode in low-shear plasmas

Fundamental Plasma Physics
Instabilities of Alfvén eigenmodes (AEs) are of significant concern because they can enhance the cross-field transport of fusion-born alpha particles beyond the neoclassical level in magnetic fusion plasmas. The threshold value of alpha-particle pressure
B.N. Breizman, S.E. Sharapov
doaj   +1 more source

Damping of magnetospheric toroidal Alfvén eigenmodes due to phase mixing

, 2013
We demonstrate that toroidal shear Alfvén eigenmodes in dipolar magnetostatic plasma equilibrium are subject to damping due to phase mixing. This result is of particular interest for the investigation of Pc5-6 geomagnetic pulsations.This research was ...
Cheremnykh, S.O., Parnowski, A.S.
core  

Convective beam ion losses due to Alfvén eigenmodes in DIII-D reversed-shear plasmas [PDF]

, 2011
Coherent losses of neutral beam ions are observed at frequencies corresponding to toroidal and reversed-shear Alfvén eigenmodes (RSAEs) in DIII-D. Reversed-shear profiles are created by injecting beam power during the plasma current ramp. Beam ion losses
Heidbrink, WW, Van Zeeland, MA, Heidbrink, W., Pace, DC, Fisher, RK, Garcia-Munoz, M., Van Zeeland, M., Pace, D., Fisher, R., García-Muñoz, M   +9 more
core   +1 more source

Observation of Reversed-Shear Alfven Eigenmodes Excited by Energetic Ions in a Helical Plasma [PDF]

, 2010
Reversed-shear Alfvén eigenmodes were observed for the first time in a helical plasma having negative q0'' (the curvature of the safety factor q at the zero shear layer).
Isobe, M., Nishiura, M., T. Shimozuma, LHD, Experiment Group, R. Sakamoto, Tanaka, K., S. Morita, S. Kubo, Kubo, S., Ido, T., Watanabe, K. Y., T. Ido, Tsumori, K., K. Ikeda, Y. Takeiri, Watanabe, F., Toi, K., M. Nishiura, T. Tokuzawa, K. Toi, Todo, Y., Kawahata, K., Ogawa, K., Sakamoto, R., Y. Oka, T. Ito, K. Tsumori, Ikeda, K., Yoshinuma, M., Kaneko, O., Takeiri, Y., T. Watari, K. Nagaoka, M. Goto, Sakakibara, S., S. Yamamoto, K. Narihara, A. Shimizu, M. Yoshinuma, Shimizu, A., J. Miyazawa, Morita, S., D. A. Spong, Funaba, H., Ida, K., M. Osakabe, F. Watanabe, Ohdachi, S., H. Funaba, Watari, T., Yamada, I., Goto, M., Komori, A., Ito, T., Minami, T., Nagaoka, K., I. Yamada, Y. Narushima, Nagayama, Y., S. Inagaki, K. Ogawa, Narushima, Y., K. Kawahata, Tokuzawa, T., O. Kaneko, A. Komori, Y. Nagayama, K. Ida, S. Ohdachi, Oka, Y., K. Y. Watanabe, T. Minami, Y. Todo, S. Murakami, Shimozuma, T., Narihara, K., Murakami, S., Inagaki, S., Osakabe, M., Spong, D. A., Miyazawa, J., M. Isobe, S. Sakakibara, K. Tanaka, Yamamoto, S., Watanabe, K.Y   +85 more
core   +1 more source

Observation of bi-directional global Alfvén eigenmodes in the MAST-U tokamak

Nuclear Fusion
The first observations and classification of deuterium beam-driven sub-cyclotron frequency range Alfvén eigenmodes (AEs) are presented for the MAST-Upgrade tokamak. Sets of observed eigenmodes are separated in frequency by approximately 200 kHz.
M.B. Dreval, H.J.C. Oliver, S.E. Sharapov, J.F. Rivero-Rodriguez, M. Fitzgerald, C. Michael, R. Ochoukov, L. Velarde, M. Cecconello, D. Ryan, the MAST-U Team   +10 more
doaj   +1 more source

Destabilization and characterization of Toroidicity-induced Alfvén Eigenmodes with Gysela [PDF]

Nuclear fusion promises a clean, limitless energy source. This thesis focuses on magnetic confinement fusion in tokamaks, which use magnetic fields to contain hot plasma in a toroidal shape, creating a stable environment for fusion reactions.
Bramucci, Lorenzo
core  

Characteristics of the Alfvénic activity during the current quench in ASDEX Upgrade

Nuclear Fusion
ASDEX Upgrade has developed multiple massive gas injection (MGI) scenarios to investigate runaway electron (RE) dynamics. During the current quench of the MGI induced disruptions, Alfvénic activity is observed in the 300–800 kHz range. With the help of a
P. Heinrich, G. Papp, Ph. Lauber, G. Pautasso, M. Dunne, M. Maraschek, V. Igochine, O. Linder, the ASDEX Upgrade Team, the EUROfusion Tokamak Exploitation Team   +9 more
doaj   +1 more source