Results 51 to 60 of about 994 (182)

Evolution of safety factor profiles in sawteeth

, 2020
Two different definitions of the safety factor are applied to investigate the evolution of the safety factor profile during normal sawteeth, the stationary state, and the incomplete reconnection. It is found that the safety factor profiles from the old definition are sometimes inconsistent with the Poincare plots of the magnetic field during sawteeth ...
Zhang, W., Ma, Z. W., Zhang, H. W.
openaire   +2 more sources

MHD, disruptions and control physics: Chapter 4 of the special issue: on the path to tokamak burning plasma operation

Nuclear Fusion
In this chapter, we review the progress in MHD stability, disruptions and control in magnetic fusion research that has occurred over the past (more than) one and a half decades since the publication by Hender et al in 2007 on the same topic as part of ...
I. Bandyopadhyay, V. Igochine, O. Sauter, S.A. Sabbagh, J.-K. Park, E. Nardon, F. Villone, M. Maraschek, G. Pautasso, N. Eidietis, S.C. Jardin, D.A. Humphreys, M. Dubrov, F.J. Artola, M. de Baar, L. Bardóczi, L.R. Baylor, J.W. Berkery, A.H. Boozer, B. Cannas, Z.Y. Chen, B. Esposito, A. Fanni, N.M. Ferraro, R. Fitzpatrick, S. Gerasimov, T. Goodman, R. Granetz, G. Granucci, J. Graves, Y. Gribov, A. Gude, M. Hoelzl, E.M. Hollmann, Q. Hu, W. Hu, Y. In, A. Isayama, N. Isernia, S. Jachmich, A.A. Kavin, R.R. Khayrutdinov, G. Kim, M. Kong, O. Kudláček, M. Lehnen, Y. Liu, N.C. Logan, V.E. Lukash, P. Maget, T. Markovic, A. Matsuyama, F. Maviglia, J.E. Menard, C. Myers, D. Orlov, A. Pau, C. Paz-Soldan, L. Piron, G. Pucella, V.D. Pustovitov, G.A. Rattá, C. Rea, H. Reimerdes, C. Reux, R. Roccella, G. Rubinacci, U. Sheikh, D. Shiraki, G. Sias, B. Sieglin, C. Sovinec, H. Strauss, Y. Sun, R. Sweeney, H.-H. Wang, S.M. Yang, V. Yanovskiy, H. Zohm, the ITPA MHD, Disruption and Control Topical Group   +79 more
doaj   +1 more source

Spatiotemporally controlled emergence of nanoparticle microvortices under electric field

Aggregate, Volume 5, Issue 2, April 2024.
Fascinating microvortices patterns emerge in swarms of nanoparticles when applying voltage via electrodes with complex shapes. In situ darkfield microscopy and particle collective analysis elucidate the mechanism behind the formation and stabilization of microvortices, attributing it to the combined effects of the sharp teeth‐mediated large‐scale ...
Qi Pan, Xijian Lin, Shiyuan Wei, Jinghong Su, Hansen Zhao, Xiaojie Duan, Guoqing Hu, Yan He   +7 more
wiley   +1 more source

Numerical modeling of linear and nonlinear evolution of tearing modes and resistive-kink modes with runaway electrons

Nuclear Fusion
In this work, we extend the three-dimensional, nonlinear resistive/two-fluid MHD code CLT to simulate runaway electron physics by implementing a widely adopted fluid runaway electron MHD (RE-MHD) model.
Y. Zhang, W. Zhang, Y.Y. Ying, Z.W. Ma
doaj   +1 more source

Benchmarking of electron cyclotron heating and current drive codes on ITER scenarios within the European Integrated Tokamak Modelling framework

EPJ Web of Conferences, 2012
Electron cyclotron resonance heating (ECRH) and electron cyclotron current drive (ECCD) are used to heat the plasma, to tailor the current profiles and to achieve different operating regimes of tokamak plasmas. Plasmas with ECRH/ECCD are characterized by
Peysson Y., Poli E., Marushchenko N. B., Farina D., Decker J., Figini L., Westerhof E.   +6 more
doaj   +1 more source

Auroral Characteristics Related to AU&AL Indices

Journal of Geophysical Research: Space Physics, Volume 129, Issue 3, March 2024.
Abstract Auroral images of the N2 Lyman‐Birge‐Hopfield emissions from Polar Ultraviolet Imager (UVI) for 1.5 years are used to investigate the auroral characteristics related to the AU and AL indices that represent the directly driven and unloading processes in the solar wind‐magnetosphere‐ionosphere coupling, respectively.
Chen Wu, Aaron J. Ridley
wiley   +1 more source

Stabilization and re-excitation of sawtooth oscillations due to energetic particles in tokamaks

Nuclear Fusion
Sawtooth oscillations, driven by internal kink modes, are fundamental phenomena in tokamak plasmas. They can be classified into different types, including normal sawteeth, small sawteeth, and in some cases, evolving into the steady-island state, each ...
H.X. Zhang, H.W. Zhang, Z.W. Ma, J.X. Huang, W. Zhang   +4 more
doaj   +1 more source

Effects of Along‐Trench Asymmetric Subduction Initiation on Plate Rotation and Trench Migration: A Laboratory Modeling Perspective

Tectonics, Volume 43, Issue 1, January 2024.
Abstract The impact of along‐trench asymmetric subduction on plate kinematic evolution (e.g., plate rotation and trench migration) remains enigmatic. In this study, analog experiments were performed to investigate the effects of symmetric and asymmetric subduction initiation on slab kinematics and trench migration.
Chunyang Wang, Weiwei Ding, Wouter P. Schellart, Zhengyi Tong, Chongzhi Dong, Yinxia Fang, Jiabiao Li   +6 more
wiley   +1 more source

Numerical and experimental study of the redistribution of energetic and impurity ions by sawteeth in ASDEX Upgrade:Paper [PDF]

, 2016
In the non-linear phase of a sawtooth, the complete reconnection of field lines around the q = 1 flux surface often occurs resulting in a radial displacement of the plasma core. A complete time-dependent electromagnetic model of this type of reconnection
Westerhof, E., EUROfusion MST1 Team, Jacobsen, Asger Schou, Salewski, Mirko, Jacobsen, A., Rasmussen, Jesper, Nielsen, S. K., Weiland, M., Salewski, M., Nielsen, Stefan Kragh, Rasmussen, J., Jacobsen, A. S., Pedersen, Morten Stejner, Stejner, M., Geiger, B., Odstrčil, T., ASDEX Upgrade Team, Jaulmes, F., Nielsen, S.   +18 more
core   +1 more source

Control of sawteeth and triggering of NTMs with ion cyclotron resonance frequency waves in JET

, 2002
A new scenario to delay or prevent neoclassical tearing mode (NTM) onset is presented. By active sawtooth destabilization, short period and low amplitude sawteeth are generated, such that the sawtooth produced NTM seed island is reduced and the threshold
Nguyen, F., Sauter, O., Maraschek, M. E., Zabiego, M., Mayoral, M. L., Belo, P., McClements, K. G., Gondhalekar, A., Westerhof, E., Buttery, R. J., Sharapov, S. E., Johnson, T., Mantsinen, M. J., Nave, M. F. F., Hender, T. C., Lamalle, P., Howell, D. F., Angioni, C., Hellsten, T., Pecquet, A. L., Podda, S., Rapp, J., Alper, B.   +22 more
core   +2 more sources