TITLE

Modeling of plasma turbulence and transport in the Large Plasma Device

AUTHOR(S)
Popovich, P.; Umansky, M. V.; Carter, T. A.; Friedman, B.
PUB. DATE
December 2010
SOURCE
Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122312
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Numerical simulation of plasma turbulence in the Large Plasma Device (LAPD) [W. Gekelman, H. Pfister, Z. Lucky et al., Rev. Sci. Instrum. 62, 2875 (1991)] is presented. The model, implemented in the BOUndary Turbulence code [M. Umansky, X. Xu, B. Dudson et al., Contrib. Plasma Phys. 180, 887 (2009)], includes three-dimensional (3D) collisional fluid equations for plasma density, electron parallel momentum, and current continuity, and also includes the effects of ion-neutral collisions. In nonlinear simulations using measured LAPD density profiles but assuming constant temperature profile for simplicity, self-consistent evolution of instabilities and nonlinearly generated zonal flows results in a saturated turbulent state. Comparisons of these simulations with measurements in LAPD plasmas reveal good qualitative and reasonable quantitative agreement, in particular in frequency spectrum, spatial correlation, and amplitude probability distribution function of density fluctuations. For comparison with LAPD measurements, the plasma density profile in simulations is maintained either by direct azimuthal averaging on each time step, or by adding particle source/sink function. The inferred source/sink values are consistent with the estimated ionization source and parallel losses in LAPD. These simulations lay the groundwork for more a comprehensive effort to test fluid turbulence simulation against LAPD data.
ACCESSION #
56912042

 

Related Articles

  • Numerical simulation and analysis of plasma turbulence the Large Plasma Device. Umansky, M. V.; Popovich, P.; Carter, T. A.; Friedman, B.; Nevins, W. M. // Physics of Plasmas;May2011, Vol. 18 Issue 5, p055709 

    Turbulence calculations with a 3D collisional fluid plasma model demonstrate qualitative and semi-quantitative similarity to experimental data in the Large Plasma Device [W. Gekelman et al., Rev. Sci. Inst. 62, 2875 (1991)], in particular for the temporal spectra, fluctuations amplitude, spatial...

  • Neoclassical equilibria as starting point for global gyrokinetic microturbulence simulations. Vernay, T.; Brunner, S.; Villard, L.; McMillan, B. F.; Jolliet, S.; Tran, T. M.; Bottino, A.; Graves, J. P. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122301 

    The implementation of linearized operators describing inter- and like-species collisions in the global gyrokinetic particle-in-cell code ORB5 [S. Jolliet, Comput. Phys. Commun. 177, 409 (2007)] is presented. A neoclassical axisymmetric equilibrium with self-consistent electric field can be...

  • Origin of higher temperatures in multidipolar plasma devices. Knappmiller, Scott; Robertson, Scott // Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p100702 

    Hot-filament discharge devices with multidipolar surface magnetic fields have densities and temperatures higher than in these devices without multidipolar fields. Probe data show a much higher density of secondary electrons from the wall with multidipolar fields that is best explained by the...

  • Dynamic procedure for filtered gyrokinetic simulations. Morel, P.; Bañón Navarro, A.; Albrecht-Marc, M.; Carati, D.; Merz, F.; Görler, T.; Jenko, F. // Physics of Plasmas;Jan2012, Vol. 19 Issue 1, p012311 

    Large eddy simulations (LES) of gyrokinetic plasma turbulence are investigated as interesting candidates to decrease the computational cost. A dynamic procedure is implemented in the gene code, allowing for dynamic optimization of the free parameters of the LES models (setting the amplitudes of...

  • Measurements and modeling of radio frequency field structures in a helicon plasma. Lee, Charles A.; Chen, Guangye; Arefiev, Alexey V.; Bengtson, Roger D.; Breizman, Boris N. // Physics of Plasmas;Jan2011, Vol. 18 Issue 1, p013501 

    Measurements of the radio frequency (rf) field structure, plasma density, and electron temperature are presented for a 1 kW argon helicon plasma source. The measured profiles change considerably when the equilibrium magnetic field is reversed. The measured rf fields are identified as fields of...

  • Distinctive features of collisionless gradient drift instabilities in a high-β plasma in a highly nonuniform magnetic field. Chirkov, A.; Khvesyuk, V. // Plasma Physics Reports;May2011, Vol. 37 Issue 5, p437 

    set of Vlasov-Maxwell equations for collisionless electromagnetic drift instabilities of high-β plasma configurations with a nonuniform magnetic fields is solved. The effect of the transverse static magnetic field variation and magnetic field line curvature, as well as the plasma temperature...

  • Spatial and temporal evolution of filamentation instability in a current-carrying plasma. Mohammadhosseini, B.; Niknam, A. R.; Shokri, B. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122303 

    The spatial and temporal evolution of the electric and magnetic fields in a current-carrying plasma is investigated in the nonlinear regime. Using the magnetohydrodynamic equations, a nonlinear diffusion equation for the magnetic field in the plasma is obtained. This nonlinear equation is...

  • Excitation of macromagnetohydrodynamic mode due to multiscale interaction in a quasi-steady equilibrium formed by a balance between microturbulence and zonal flow. Ishizawa, A.; Nakajima, N. // Physics of Plasmas;Apr2007, Vol. 14 Issue 4, p040702 

    This is the first numerical simulation demonstrating that a macromagnetohydrodynamic (macro-MHD) mode is excited as a result of multi-scale interaction in a quasi-steady equilibrium formed by a balance between microturbulence and zonal flow based on a reduced two-fluid model. This simulation of...

  • Coherent Structures and Intermittency in Plasma Turbulence. Das, Amita; Kaw, Predhiman; Sen, Abhijit // AIP Conference Proceedings;10/15/2008, Vol. 1061 Issue 1, p14 

    The paper discusses some fundamental issues related to the phenomenon of intermittency in plasma turbulence with particular reference to experimental observations in fusion devices. Intermittency is typically associated with the presence of coherent structures in turbulence. Since coherent...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics