Results 81 to 90 of about 994 (182)

Fluctuation and transport reduction in a reversed field pinch by inductive poloidal current drive

open access: yes, 1993
An auxilliay poloidal inductive electric field applied to a reversed field pinch plasma reduces the current density gradient, slows the growth of m=1 tearing fluctations, suppresses their associated sawteeth, and doubles the energy confinement time ...
Sarff, J. S.   +4 more
core   +1 more source

On ion cyclotron current drive for sawtooth control

open access: yes, 2005
Experiments using ion cyclotron current drive (ICCD) to control sawteeth are presented. In particular, discharges demonstrating shortening of fast ion induced long sawteeth reported in (Eriksson et al 2004 Phys. Rev. Lett.
Sauter, O.   +13 more
core   +2 more sources

Neural network-based classification and regression of magnetohydrodynamic modes in tokamaks

open access: yesNuclear Fusion
We present a machine learning-based magnetohydrodynamic (MHD) classifier and regressor that utilizes real or complex-valued 3D magnetic sensor array data to determine neoclassical tearing mode (NTM) onset times in tokamaks with millisecond accuracy.
L. Bardoczi   +6 more
doaj   +1 more source

Sustaining DIII-D High Beta Discharges Without the Sawteeth That Can Lead to Disruptions

open access: yes, 2018
We discuss three methods for avoiding or minimizing sawteeth (ST) in DIII-D. Two methods rely on relatively benign internal 3D perturbations to redistribute poloidal flux, causing the minimum safety factor (qmin) to stay above unity and thus avoiding ...
Luce T   +4 more
core  

Overview of the MAST Upgrade physics programme: testing novel concepts at low aspect ratio to inform future devices

open access: yesNuclear Fusion
The research programme performed on the Mega Amp Spherical Tokamak (MAST) Upgrade experiment has made significant advances in developing the physics understanding of low aspect ratio tokamaks in support of the operation of ITER and design of fusion ...
J.R. Harrison   +383 more
doaj   +1 more source

On the two time scales of the sawteeth precursors

open access: yes, 1988
For current profiles with a slope discontinuity at $\epsilon_{2}$ close to $\epsilon_{1}$ [q($\epsilon_{1}$) = 1] and a small shear $\widehat{s}$ ($\epsilon_{1}$), the jump of the derivative of the magnetohydrodynamic (MHD) solution across the singular q=1 layer is of the form [$\psi$']$_{\epsilon_{1}}$ $\varpropto$ $\widehat{s}$$_{1}$ [1 - 4f($\mu$) $\
Rogister, A., Singh, R.
openaire   +1 more source

Energy-selective confinement of fusion-born alpha particles during internal relaxations in a tokamak plasma. [PDF]

open access: yesNat Commun, 2022
Bierwage A   +11 more
europepmc   +1 more source

Sawteeth and other Transport Phenomena Induced by Ex-drifts in Tokamaks

open access: yes, 1997
Electric fields and the concomitant ExB-drift play a prominent role in many plasma physics phenomena in Tokamaks. Several issues relevant for fusion research and related to the ExB-driven transport, are addressed in the present thesis.
Ödblom, Anders,
core   +1 more source

Home - About - Disclaimer - Privacy