Results 141 to 150 of about 994 (182)

Imaging and manipulation of sawteeth and tearing modes in TEXTOR

, 2006
Jaspers, R. J. E., Hogeweij, G. M. D., Luhmann, N. C., Merkulov, A., Schüller, F. C., Varshney, S. K., Westerhof, E., Zimmermann, O., Park, H. K., de Bock, M., Classen, I. G. J., Domier, C. W., Donné, A. J. H., Koslowski, H. R., Liang, Y., Lopes-Cardozo, N. J.   +15 more
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Coupling Between Sawteeth and Tearing Modes in TCV

, 2011
Canal, G. P., Duval, Basil, Felici, Federico Alberto Alfredo, Goodman, Timothy, Graves, Jonathan, Pochelon, Antoine, Reimerdes, Holger, Sauter, Olivier, Testa, Duccio, Team, TCV   +9 more
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Skin Currents and Compound Sawteeth in Tokamaks

Physical Review Letters, 1986
Two-dimensional MHD simulations are carried out which demonstrate that the cross-field thermal conduction near the magnetic axis controls the structure of sawteeth in tokamaks. In simulations of discharges with good central confinement, skin currents form at a finite radius causing the safety factor q to fall below 1 away from the magnetic axis.
Richard E Denton, James F. Drake, Robert G Kleva   +2 more
exaly   +3 more sources

Sawteeth and Transport in Tokamaks

Plasma Physics and Controlled Fusion, 1994
Sawtooth activity occurs in ohmically heated tokamak plasmas even at high values of edge safety factor. This is not consistent with the predictions of transport calculations in which the resistivity is classical and the thermal conductivity is uniform. In that case q falls to unity in the centre only if the edge q is less than 3.3. Sawteeth can persist
D J Ward
exaly   +2 more sources

Controlled Sawteeth for Helium Exhaust

Fusion Science and Technology, 1998
The influence of controlled sawteeth on thermal helium exhaust is explored using the BALDUR 11/2-dimensional transport code for an ARIES-I-type plasma. Sawteeth are shown to be useful for removing thermal helium from the central region to the outer region of a tokamak plasma.
George H Miley
exaly   +2 more sources

Nature of Monster Sawteeth and Their Relationship to Alfvén Instabilities in Tokamaks

Physical Review Letters, 2000
A correlation is explored between the presence of energetic particle modes (EPM) and long-period sawtooth oscillations in tokamak plasmas heated by rf waves. The eventual crash of these sawteeth is explained in terms of the loss of the stabilizing fast particles due to the EPM. The absence of long-period sawteeth in high q(a) discharges is explained in
J C Hosea, C K Phillips, M G Bell
exaly   +3 more sources

Transport and Reconnection in Tokamak Sawteeth

Physical Review Letters, 2003
The core of a tokamak discharge often undergoes periodic relaxation oscillations, sawteeth, as the steepening current and temperature profiles are flattened by fast reconnection events. Careful analysis of the electron temperature evolution over this cycle gives an estimate of the energy dissipated in the electrons during reconnection and a measure of ...
K W, Gentle, M E, Austin, P E, Phillips
openaire   +2 more sources

Stabilization of Sawteeth with Additional Heating in the JET Tokamak

Physical Review Letters, 1988
Experiments in the JET tokamak with additional heating power (ion cyclotron resonance heating and/or neutral beam injection) above 5 MW show that the plasma can undergo a transition to a new regime. In this regime, the sawtooth instability is suppressed for periods of up to 1.6 S and the level of long-wavelength, coherent MHD activity is very low.
D J Campbell, D F H Start, J A Wesson, D V Bartlett, V P Bhatnagar, M Bures, J G Cordey, G A Cottrell, P A Dupperex, A W Edwards, C D Challis, C Gormezano, C W Gowers, R S Granetz, J H Hammen, T Hellsten, J Jacquinot, E Lazzaro, P J Lomas, N Lopes Cardozo, P Mantica, J A Snipes, D Stork, P E Stott, P R Thomas, E Thompson, K Thomsen, G Tonetti   +27 more
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ELMs and sawteeth with ICRF heating on ASDEX upgrade

AIP Conference Proceedings, 1999
The ASDEX Upgrade ICRF system has recently been completely equipped with 3-dB couplers. They reduce, in a purely passive way, the sensivity of the ICRF system to fast coupling changes as occur in the presence of ELMs. They also make the matching less critical and allow variations of the plasma conditions, even with fixed matching during a discharge ...
Noterdaeme, J., Brambilla, M., Brüsehaber, B., Dux, R., Fahrbach, H.   +4 more
openaire   +2 more sources

Stabilization of sawteeth in tokamaks with toroidal flows

Physics of Plasmas, 2002
Sheared toroidal flows with a magnitude of the order of the sound speed are shown to stabilize sawteeth in tokamaks. In the absence of flows, tokamak equilibria in which the central safety factor q is less than unity are unstable to resistive tearing modes (resistive internal kink modes) with toroidal mode number n=1.
Robert G. Kleva, Parvez N. Guzdar
openaire   +1 more source