Results 21 to 30 of about 2,674 (184)

Achievement of ion temperatures in excess of 100 million degrees Kelvin in the compact high-field spherical tokamak ST40

Nuclear Fusion, 2023
Ion temperatures of over 100 million degrees Kelvin (8.6 keV) have been produced in the ST40 compact high-field spherical tokamak (ST). Ion temperatures in excess of 5 keV have not previously been reached in any ST and have only been obtained in much ...
S.A.M. McNamara, O. Asunta, J. Bland, P.F. Buxton, C. Colgan, A. Dnestrovskii, M. Gemmell, M. Gryaznevich, D. Hoffman, F. Janky, J.B. Lister, H.F. Lowe, R.S. Mirfayzi, G. Naylor, V. Nemytov, J. Njau, T. Pyragius, A. Rengle, M. Romanelli, C. Romero, M. Sertoli, V. Shevchenko, J. Sinha, A. Sladkomedova, S. Sridhar, Y. Takase, P. Thomas, J. Varje, B. Vincent, H.V. Willett, J. Wood, D. Zakhar, D.J. Battaglia, S.M. Kaye, L.F. Delgado-Aparicio, R. Maingi, D. Mueller, M. Podesta, E. Delabie, B. Lomanowski, O. Marchuk, the ST40 Team   +41 more
doaj   +1 more source

On The Confinement of a Tokamak Plasma [PDF]

SIAM Journal on Mathematical Analysis, 2010
The goal of this paper is to understand from a mathematical point of view the magnetic confinement of plasmas for fusion. Following Frénod and Sonnendrücker \cite{FS2}, we first use two-scale convergence tools to derive a gyrokinetic system for a plasma submitted to a large magnetic field with a slowly spatially varying intensity.
openaire   +2 more sources

MHD Instabilities in Tokamaks [PDF]

Fusion Science and Technology, 2006
A general introduction to ideal magnetohydrodynamic (MHD) stability of tokamak plasmas is given, using linear perturbations of the ideal MHD equations.
openaire   +4 more sources

Plasma Equilibrium in Tokamaks [PDF]

Fusion Science and Technology, 2006
This lecture treats the magnetohydrodynamic (MHD) equilibrium of axisymmetric plasmas, as given by the Grad-Shafranov equation.
openaire   +5 more sources

Interplay between beam-driven chirping modes and plasma confinement transitions in spherical tokamak ST40

Nuclear Fusion, 2022
Experiments on the high field spherical tokamak ST40 have led to the recent observation of interplay between beam-driven modes of sweeping frequency (chirping modes) and transitions to the enhanced global confinement regime (H-mode) and back to the low ...
J. Bland, J. Varje, N.N. Gorelenkov, M.P. Gryaznevich, S.E. Sharapov, J. Wood, Team The ST40   +6 more
doaj   +1 more source

In-situ Low Power Tests of the ASDEX Upgrade ECRH Transmission Lines [PDF]

EPJ Web of Conferences
An Electron Cyclotron Resonance Heating (ECRH) system employing 8 gyrotrons is in routine operation at the ASDEX Upgrade tokamak at IPP Garching. The gyrotrons are of two-frequency type operating at 105 and 140 GHz with a maximum output power of up to 1 ...
Wagner Dietmar, Leuterer Fritz, Monaco Francesco, Schütz Harald, Stober Jörg, Thumm Manfred   +5 more
doaj   +1 more source

Perturbative analysis of low-frequency instabilities in high-field ST40 experiments

Nuclear Fusion, 2023
Linear and nonlinear perturbative analyses of low-frequency instabilities are presented for ST40 spherical torus high field plasmas, with simultaneous neutral beam heating due to two tangential sources at 25 keV and 55 keV.
V.N. Duarte, N.N. Gorelenkov, S.M. Kaye, P.J. Bonofiglo, M. Podestà, J. Bland, P. Buxton, M. Gryaznevich, M. Romanelli, M. Sertoli   +9 more
doaj   +1 more source

Theoretical–Computational Study of Atmospheric DBD Plasma and Its Utility for Nanoscale Biocompatible Plasmonic Coating

Molecules, 2021
In this study, time-dependent, one-dimensional modeling of a surface dielectric barrier discharge (SDBD) device, driven by a sinusoidal voltage of amplitude 1–3 kV at 20 kHz, in argon is described. An SDBD device with two Cu-stripe electrodes, covered by
Taj Muhammad Khan, Shahab Ud-Din Khan, Muhammad Raffi, Riaz Khan   +3 more
doaj   +1 more source

Evaluation of the functional acceptability of the ITER vacuum vessel

Nuclear Fusion, 2022
The International Thermonuclear Experimental Reactor (ITER) vacuum vessel (VV) is one of the critical components of the ITER tokamak fusion reactor. The first sector of the ITER VV was delivered to ITER Organization in 2020, and it is ready to assemble ...
Hokyu Moon, Soo-Hyeon Park, Hyun-Soo Kim, Beom Seok Kim   +3 more
doaj   +1 more source

A model of multi-pass absorption of external EC radiation at initial stage of discharge in ITER

EPJ Web of Conferences, 2015
A model is developed for multi-pass absorption of external electron cyclotron radiation (ECR) in tokamaks, which is used at initial stage of discharge to overcome the impurity radiation barrier (burn-through). Model is based on a semi-analytical solution
Minashin P.V., Kukushkin A.B., Khayrutdinov R.R., Lukash V.E.   +3 more
doaj   +1 more source