Results 11 to 20 of about 1,922,886 (290)

Control of Transport-Barrier Relaxations by Resonant Magnetic Perturbations

Physical Review Letters, 2009
Transport-barrier relaxation oscillations in the presence of resonant magnetic perturbations are investigated using three-dimensional global fluid turbulence simulations from first principles at the edge of a tokamak. It is shown that resonant magnetic perturbations have a stabilizing effect on these relaxation oscillations and that this effect is due ...
Leconte, Michael, Beyer, P., Garbet, Xavier, Benkadda, S.   +3 more
openaire   +5 more sources

Isochronous island bifurcations driven by resonant magnetic perturbations in tokamaks [PDF]

Physical Review E
Recent evidences show that heteroclinic bifurcations in magnetic islands may be caused by the amplitude variation of resonant magnetic perturbations in tokamaks. To investigate the onset of these bifurcations, we consider a large aspect ratio tokamak with an ergodic limiter composed of two pairs of rings that create external primary perturbations with ...
Leal, B. B., Caldas, I. L., de Sousa, M. C., Viana, R. L., Ozorio de Almeida, A. M.   +4 more
core   +5 more sources

Understanding the effect resonant magnetic perturbations have on ELMs [PDF]

Plasma Physics and Controlled Fusion, 2013
All current estimations of the energy released by type I ELMs indicate that, in order to ensure an adequate lifetime of the divertor targets on ITER, a mechanism is required to decrease the amount of energy released by an ELM, or to eliminate ELMs altogether.
Kirk, A, Chapman, I T, Evans, T E, Ham, C, Harrison, J R, Huijsmans, G, Liang, Y, Liu, Y Q, Loarte, A, Suttrop, W, Thornton, A J   +10 more
openaire   +3 more sources

Applications of cosmological perturbation theory [PDF]

, 2011
PhDCosmological perturbation theory is crucial for our understanding of the universe. The linear theory has been well understood for some time, however developing and applying the theory beyond linear order is currently at the forefront of research in
Christopherson, Adam J.
core   +4 more sources

Transition in particle transport under resonant magnetic perturbations in a tokamak

Nuclear Fusion, 2023
Nonlinear 3D MHD simulations and validations reveal that the hybrid particle-MHD transport is a key process for driving the pump-out in the presence of Resonant Magnetic Perturbations (RMPs) in the KSTAR tokamak.
S.K. Kim, N.C. Logan, M. Becoulet, M. Hoelzl, Q. Hu, G.T.A. Huijsmans, S.J.P. Pamela, Q. Yu, S.M. Yang, C. Paz-soldan, E. Kolemen, J.-K. Park   +11 more
doaj   +1 more source

Effect of resonant magnetic perturbations on particle confinement [PDF]

Nuclear Fusion, 2009
The effect of externally applied resonant magnetic perturbations (RMPs) on plasma particle transport is investigated based on two fluid equations. It is found that, depending on the frequency and direction of plasma rotation, the RMP of a moderate amplitude can either increase or decrease the plasma density gradient around the corresponding rational ...
Yu, Q., Günter, S.
openaire   +3 more sources

Plasma response impact on RMP divertor footprint modeling for KSTAR

Nuclear Materials and Energy, 2023
The striation pattern of heat loads on the divertor targets is determined by the plasma response to external resonant magnetic perturbations (RMPs) applied for suppression of edge localized modes (ELMs).
H. Frerichs, J. Van Blarcum, S.M. Yang, J-K. Park, N.C. Logan, Y. Feng, O. Schmitz   +6 more
doaj   +1 more source

Spectra of magnetic perturbations triggered by pellets in JET plasmas [PDF]

, 2010
Aiming at investigating edge localised mode (ELM) pacing for future application on ITER, experiments have been conducted on JET injecting pellets in different plasma configurations, including high confinement regimes with type-I and type-III ELMs, low ...
Poli, F., Lang, P.T., F.M. Poli, Sharapov, E.E., Lang, P., Alper, S., Sharapov, S. E., Poli, F. M., JET-EFDA Contributors, B. Alper, null null, Poli, F. M. (Francesca), S.E. Sharapov, HASH(0x55a67fc0d2b0), Lang, P. T., HASH(0x55a67f978e80), H.R. Koslowski, Koslowski, H. R., Poli, F.M., Sharapov, S., P.T. Lang, Sharapov, S. E. (Sergei E.), Koslowski, H., Alper, B.   +23 more
core   +1 more source

Gas puff imaging measurements during resonant magnetic perturbations on the HL-2A tokamak

Nuclear Fusion, 2023
The gas puff imaging diagnostic is used for the investigation of the poloidal flow and turbulent fluctuations at the plasma edge and scrape-off layer (SOL) on the HL-2A tokamak.
J.B. Yuan, M. Xu, Y. Yu, B.D Yuan, L. Nie, Z.H. Wang, T.F. Sun, T. Wu, R. Ke, T. Long, S.B. Gong, X.Q. Ji, J.Q. Li, HL-2A team   +13 more
doaj   +1 more source

Tearing mode dynamics in the presence of resonant magnetic perturbations

, 2016
Magnetically confined fusion (MCF) plasmas are typically subject to several unstable modes. The growth of one mode can limit the plasma energy confinement and might cause a termination of the plasma. Externally applied resonant magnetic perturbations (RMPs) are used to control and to mitigate some of the unstable modes. Examples are, mitigation of edge
Fridström, Richard
core   +4 more sources