Journal ArticleDOI
Power deposition for ion cyclotron heating in large tokamaks
T. Hellsten,Laurent Villard +1 more
TLDR
In this article, the power deposition profiles during minority ion cyclotron heating are analyzed in large tokamaks by using the global toroidal wave code LION and a heuristic formula is given.Abstract:
The power deposition profiles during minority ion cyclotron heating are analysed in large tokamaks by using the global, toroidal wave code LION. For tokamaks with large aspect ratio and with circular cross-section, the wave is focused on the magnetic axis and can be absorbed there by cyclotron absorption when the cyclotron resonance passes through the magnetic axis. The power deposition profile is then essentially determined by the Doppler broadening of the ion cyclotron resonance. For equilibria either non-circular or with a small aspect ratio the power deposition profile depends also on the strength of the damping. In this case the power deposition profile can be expressed as a sum of two power deposition profiles. One is related to the power absorbed in a single pass, and its shape is similar to that obtained for large aspect ratio and circular cross-section. The other profile is obtained by calculating the power deposition in the limit of weak damping, in which case the wave electric field is almost constant along the cyclotron resonance layer. A heuristic formula for the power deposition is given. The formula includes a number of calibration curves and functions which has been calculated with the LION code for JET relevant equilibria. The formula enables calculation of the power deposition profile in a simple way when the launched wave spectrum and damping coefficients are known.read more
Citations
More filters
Journal ArticleDOI
The CRONOS suite of codes for integrated tokamak modelling
J.F. Artaud,V. Basiuk,Frederic Imbeaux,M. Schneider,J. Garcia,G. Giruzzi,P. Huynh,T. Aniel,F. Albajar,J.M. Ané,A. Bécoulet,Clarisse Bourdelle,A. Casati,L. Colas,J. Decker,R. J. Dumont,L.-G. Eriksson,Xavier Garbet,R. Guirlet,P. Hertout,G.T. Hoang,Wayne A Houlberg,G. T. A. Huysmans,E. Joffrin,S.H. Kim,F. Köchl,J.B. Lister,X. Litaudon,Patrick Maget,R. Masset,B. Pégourié,Y. Peysson,P. R. Thomas,E. Tsitrone,Francesca Turco +34 more
TL;DR: The CRONOS suite as mentioned in this paper is a suite of numerical codes for the predictive/interpretative simulation of a full tokamak discharge, which integrates, in a modular structure, a 1D transport solver with general 2D magnetic equilibria, several heat, particle and impurities transport models, as well as heat and particle and momentum sources.
Journal ArticleDOI
Comparison of time dependent simulations with experiments in ion cyclotron heated plasmas
TL;DR: In this article, a time dependent simulation of the majority heating of hydrogen in a deuterium plasma in the JET tokamak has been performed and the results showed good agreement between measurements and calculations for relatively low power levels only.
Journal ArticleDOI
Finite Larmor radius wave equations in Tokamak plasmas in the ion cyclotron frequency range
TL;DR: In this article, the constitutive relation of a nonhomogeneous plasma for h.f. waves in the ion cyclotron frequency domain is derived by integrating the Vlasov equation along the unperturbed particle orbits in the drift approximation.
Journal ArticleDOI
Equilibrium analysis of tokamak discharges with anisotropic pressure
TL;DR: In this article, an anisotropic pressure model for the EFIT equilibrium reconstruction code has been proposed, which exhibits more degrees of freedom and makes the reconstruction more sensitive to experimental errors.
Journal ArticleDOI
A model for calculating icrh power deposition and velocity distribution
L.-G. Eriksson,Torbjörn Hellsten +1 more
TL;DR: In this article, the power deposition and the velocity distribution depend on each other, making it necessary to calculate a power deposition which is consistent with the velocities of the resonating ions.
References
More filters
Journal ArticleDOI
Global Waves in Cold-Plasmas
TL;DR: In this paper, numerical methods developed for the calculation of global wave solutions in cold plasmas, in connection with rf heating in the Alfven and ion Cyclotron Range Frequency, are presented.
Journal ArticleDOI
Textbook Finite-Element Methods Applied to Linear Wave-Propagation Problems Involving Conversion and Absorption
TL;DR: In this paper, a system of two second-order ordinary differential equations describing wave propagation in a hot plasma is solved numerically by the finite element method involving standard linear and cubic elements.
Journal ArticleDOI
A global solution of the ICRH problem based on the combined use of a planar coupling model and hot-plasma ray-tracing in tokamak geometry
TL;DR: In this paper, the global solution of the theoretical problem of ion cyclotron resonance heating in tokamak plasmas is obtained by a subdivision of the problem into two simpler ones by virtue of the single pass absorption hypothesis.
Journal ArticleDOI
Three-dimensional structures of ICRF waves in tokamak plasmas
TL;DR: In this paper, the three-dimensional structure of ICRF (Ion Cyclotron Range of Frequency) waves in a tokamak plasma is investigated, and the wave field and the energy deposition profile are obtained by introducing a simple model for the collision.
Journal ArticleDOI
ICRF wave propagation and absorption in tokamak and mirror magnetic fields: a full-wave calculation
TL;DR: In this article, global solutions for the ion cyclotron resonant frequency (ICRF) wave fields in a straight tokamak with rotational transform and a poloidally symmetric mirror are calculated in the cold plasma limit.