Toroidal universal drift instability: A global gyrokinetic study

Chowdhury, J.; Ganesh, R.; Brunner, S.; Vaclavik, J.; Villard, L.
October 2010
Physics of Plasmas;Oct2010, Vol. 17 Issue 10, p102105
Academic Journal
An electron density gradient driven instability identified as the toroidal branch of the universal drift instability is studied using a global gyrokinetic model treating both electrons and ions fully nonadiabatically and valid at all orders in the ratio of the Larmor radius to the wavelength. The physics of the magnetic drift resonance, Landau resonance and transit resonance, which are considered to be important for the toroidal universal mode, are kept for both species. A systematic parametric study is carried out for the mode. The toroidal universal drift mode is observed to sustain finite temperature gradient and can thus coexist with the temperature gradient driven modes and may contribute to the observed particle transport along with other drift modes. Especially at intermediate scales between the ion temperature gradient driven mode and electron temperature gradient driven mode, this branch of the drift instability can also be a plausible candidate for the observed particle loss. The effect of magnetic fluctuations on the mode is also investigated. In contrast to the slab mode, the toroidal branch of the universal drift mode is found to be strongly stabilized by electromagnetic effects at finite plasma β. Finally, the effect of trapped electrons on the universal mode is studied and compared with the other possible modes in the same parameter regime, namely, ion temperature gradient mode in the presence of trapped electrons and pure trapped electron modes.


Related Articles

  • Toroidal electron temperature gradient driven drift modes. Horton, W.; Hong, B. G.; Tang, W. M. // Physics of Fluids (00319171);Oct88, Vol. 31 Issue 10, p2971 

    The electron temperature gradient in tokamak geometry is shown to drive a short wavelength lower hybrid drift wave turbulence resulting from the unfavorable magnetic curvature on the outside of the toms. Ballooning mode theory is used to determine the stability regimes and the complex...

  • Fast wave stabilization/destabilization of drift waves in a plasma. Kumar, Pawan; Tripathi, V. K. // Physics of Plasmas;Mar2013, Vol. 20 Issue 3, p032502 

    Four wave-nonlinear coupling of a large amplitude whistler with low frequency drift wave and whistler wave sidebands is examined. The pump and whistler sidebands exert a low frequency ponderomotive force on electrons introducing a frequency shift in the drift wave. For whistler pump propagating...

  • Electron-temperature-gradient drift wave instabilities in magnetized electron–ion plasmas. Murtaza, G.; Nadeem, M.; Shukla, P. K. // Physics of Fluids B: Plasma Physics;Jun91, Vol. 3 Issue 6, p1507 

    A general local dispersion relation is derived for the circulating electron-temperature-gradient-driven drift waves in an inhomogeneous magnetized electron–ion plasma. By taking specific limits, two new instabilities are shown to exist. The resulting quasilinear electron energy and...

  • Stability analysis of self-gravitational electrostatic drift waves for a streaming nonuniform quantum dusty magnetoplasma. Bashir, M. F.; Jamil, M.; Murtaza, G.; Salimullah, M.; Shah, H. A. // Physics of Plasmas;Apr2012, Vol. 19 Issue 4, p043701 

    Using the quantum hydrodynamic model of plasmas, the stability analysis of self-gravitational electrostatic drift waves for a streaming non-uniform quantum dusty magnetoplasma is presented. For two different frequency domains, i.e., Ω0d<ω<Ω0i (unmagnetized dust) and ω<Ω0d<Ω0i...

  • Rotation dependence of a phase delay between plasma edge electron density and temperature fields due to a fast rotating, resonant magnetic perturbation field. Stoschus, H.; Schmitz, O.; Frerichs, H.; Jakubowski, M. W.; Unterberg, B.; Abdullaev, S. S.; Clever, M.; Coenen, J. W.; Kruezi, U.; Schega, D.; Samm, U. // Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p060702 

    Measurements of the plasma edge electron density ne and temperature Te fields during application of a fast rotating, resonant magnetic perturbation (RMP) field show a characteristic modulation of both, ne and Te coherent to the rotation frequency of the RMP field. A phase delay...

  • Electron temperature fluctuation measurement from ECE on TEXT-U. Kwon, M.; Gandy, R. F.; Thomas, C. E.; Lim, W. K. // Review of Scientific Instruments;Oct92, Vol. 63 Issue 10, p4633 

    The conceptual design and theory of diagnostics to measure electron temperature and density fluctuations using electron cyclotron emission (ECE) was proposed and a new, single-sightline ECE system with the heterodyne radiometer has been built for TEXT-U. This ECE system was designed to employ...

  • Plasma properties downstream of a low-power Hall thruster. Beal, Brian E.; Gallimore, Alec D.; Hargus, William A. // Physics of Plasmas;Dec2005, Vol. 12 Issue 12, p123503 

    Triple Langmuir probes and emissive probes were used to measure the electron number density, electron temperature, and plasma potential downstream of a low-power Hall thruster. The results show a polytropic relation between electron temperature and electron number density throughout the sampled...

  • A flowing plasma model to describe drift waves in a cylindrical helicon discharge. Chang, L.; Hole, M. J.; Corr, C. S. // Physics of Plasmas;Apr2011, Vol. 18 Issue 4, p042106 

    A two-fluid model developed originally to describe wave oscillations in the vacuum arc centrifuge, a cylindrical, rapidly rotating, low temperature, and confined plasma column, is applied to interpret plasma oscillations in a RF generated linear magnetized plasma [WOMBAT (waves on magnetized...

  • Stochastic particle transport in a magnetic island due to electrostatic drift waves. Nishimura, Y. // Physics of Plasmas;Jul97, Vol. 4 Issue 7, p2365 

    Studies the effect of poloidally mode coupled, ballooning type electrostatic drift waves on a magnetic island. Indication that particle orbits can become stochastic; Particle orbits' behavior as a possible candidate for the radial plasma transport across a magnetic island of a tokamak.


Read the Article


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

Try another library?
Sign out of this library

Other Topics