Collisionless trapped electron and ion temperature gradient modes in an advanced tokamak equilibrium

Mahmood, M. Ansar; Rafiq, T.; Persson, M.; Weiland, J.
February 2009
Physics of Plasmas;Feb2009, Vol. 16 Issue 2, pN.PAG
Academic Journal
The linear stability of coupled collisionless trapped electron (TE) and ion temperature gradient (ITG) modes is investigated in an International Thermonuclear Experimental Reactor [C. Gormezano et al., Nucl. Fusion 47, S285 (2007)]-like magnetic field configuration. An advanced fluid model in the electrostatic limit and the ballooning mode formalism are used to derive an eigenvalue equation. The growth rates and real frequencies of the most unstable modes and their eigenfunctions are calculated. The coexistence of unstable ITG and TE modes and their relative strengths with respect to the fraction of trapped electrons, wave vector, and local plasma parameters, such as density gradient, electron/ion temperature gradient, and ion to electron temperature ratio are analyzed. The influence of geometrical factors, such as local/global magnetic shear and magnetic field curvature on both ITG and TE modes is also discussed.


Related Articles

  • Numerical study of zonal flow dynamics and electron transport in electron temperature gradient driven turbulence. Jiquan Li; Kishimoto, Y. // Physics of Plasmas;Apr2004, Vol. 11 Issue 4, p1493 

    The electron temperature gradient (ETG) driven turbulence in tokamak core plasmas is numerically investigated based on a three-dimensional gyrofluid model with adiabatic ion response. Attentions are focused on the zonal flow dynamics in ETG fluctuations and the resultant electron heat transport....

  • Magnetic field threshold for runaway generation in tokamak disruptions. Fülöp, T.; Smith, H. M.; Pokol, G. // Physics of Plasmas;Feb2009, Vol. 16 Issue 2, pN.PAG 

    Experimental observations show that there is a magnetic field threshold for runaway electron generation in tokamak disruptions. In this work, two possible reasons for this threshold are studied. The first possible explanation for these observations is that the runaway beam excites whistler waves...

  • Impact of magnetic field inhomogeneity on electron cyclotron radiative loss in tokamak reactors. Kukushkin, A.; Minashin, P.; Polevoi, A. // Plasma Physics Reports;Mar2012, Vol. 38 Issue 3, p187 

    The potential importance of electron cyclotron (EC) emission in the local electron power balance in the steady-state regimes of ITER operation with high temperatures, as well as in the DEMO reactor, requires accurate calculation of the one-dimensional (over magnetic surfaces) distribution of the...

  • Model Magnetic Field Configurations with Islands. Chudnovskiy, A.N. // Plasma Physics Reports;Nov2004, Vol. 30 Issue 11, p907 

    Helical perturbations of the tokamak magnetic field can give rise to magnetic islands in the vicinity of the rational magnetic surfaces at which the pitch of the magnetic field lines coincides with that of the perturbation. The widely known relationship between the magnetic island width and the...

  • Measurements of the Fluctuation-Induced Flux with Emissive Probes in the CASTOR Tokamak. Schrittwieser, R.; Adámek, J.; Balan, P.; Ďuran, I.; Hron, M.; Ionită, C.; Martines, E.; Stöckel, J.; Tichý, M.; Van Oost, G. // AIP Conference Proceedings;2003, Vol. 669 Issue 1, p207 

    In the edge region of the CASTOR tokamak the radial particle flux, induced by fluctuations of the poloidal electric field and of the density, and the electron temperature have been measured. In contrast to the standard procedure using cold probes, here emissive probes have been used to determine...

  • Collisionless current generation in the center of the tokamak plasma by an isotropic source of α-particles. Ilgisonis, V. I.; Sorokina, E. A.; Yurchenko, É. I. // Plasma Physics Reports;Jan2010, Vol. 36 Issue 1, p1 

    The density of the noninductive current generated due to collisionless motion of α-particles in the tokamak magnetic field is calculated. The analysis is based on fully three-dimensional calculations of charged particle trajectories without simplifying assumptions typical for drift and...

  • Influence of Weak Electrostatic Perturbations on the Trajectories of Circulating Particles in a Tokamak Magnetic Field. Chirkov, A. Yu. // Technical Physics;Dec2004, Vol. 49 Issue 12, p1586 

    The influence of weak electrostatic perturbations on the trajectories of circulating particles in a tokamak magnetic field is analyzed. The parameters of the trajectories calculated in the drift approximation allow one to determine the spatial scale of diffusion. The resonant interaction between...

  • Particle transport in reversed field pinch helium plasmas. Lorenzini, R.; Auriemma, F.; Canton, A.; Carraro, L. // Physics of Plasmas;Nov2006, Vol. 13 Issue 11, p112510 

    The isotope effect is known to influence the transport in tokamak machines. In this paper is investigated the isotope effect in the reversed field pinch configuration comparing the particle transport in He and H discharges in the reversed field pinch experiment [G. Rostagni, Fusion Eng. Des. 25,...

  • Electron thermal transport within magnetic islands in the reversed-field pinch. Stephens, H. D.; Den Hartog, D. J.; Hegna, C. C.; Reusch, J. A. // Physics of Plasmas;May2010, Vol. 17 Issue 5, p056115 

    Tearing mode induced magnetic islands have a significant impact on the thermal characteristics of magnetically confined plasmas such as those in the reversed-field pinch (RFP). New Thomson scattering diagnostic capability on the Madison Symmetric Torus (MST) RFP has enabled measurement of the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics