Effects of the Shafranov shift on the ballooning mode in negative shear

1999 ◽  
Vol 77 (1) ◽  
pp. 1-5
Author(s):  
M Elia ◽  
A Hirose
Keyword(s):  
Kinetic Model ◽  
Flux Surface ◽  
Ballooning Mode ◽  
52.35 Fp ◽  
Shafranov Shift ◽  
Two Fluid ◽  
Mode A

In negative shear tokamak discharges, an excessively large Shafranov shift (Δ') destabilizes the magnetohydrodynamic ballooning mode. A kinetic model, local to a flux surface and which employs the ballooning-mode representation of the gyrokinetic equations, also predicts the existence of the instability as does two-fluid theory.PACS Nos.: 52.35.Fp, 52.35.Kt, 52.55.Fa

Drift ballooning mode in a kinetic model of the near-Earth plasma sheet

1999 ◽  
Vol 104 (A6) ◽  
pp. 12289-12299 ◽  
Author(s):  
P. L. Pritchett ◽  
F. V. Coroniti
Keyword(s):  
Kinetic Model ◽  
Plasma Sheet ◽  
Ballooning Mode

scholarly journals Developments in the theory of collisionless reconnection in magnetic configurations with a strong guide field

2004 ◽  
Vol 11 (5/6) ◽  
pp. 567-577 ◽  
Author(s):  
F. Pegoraro ◽  
D. Borgogno ◽  
F. Califano ◽  
D. Del Sarto ◽  
E. Echkina ◽  
...  
Keyword(s):  
Kinetic Model ◽  
Two Dimensional ◽  
Plasma Model ◽  
Guide Field ◽  
Laboratory Plasmas ◽  
Collisionless Reconnection ◽  
Two Fluid

Abstract. We review some recent results that have been obtained in the investigation of collisionless reconnection in two dimensional magnetic configurations with a strong guide field in regimes of interest for laboratory plasmas. First we adopt a two-fluid dissipationless plasma model where the plasma evolution is described by the advection of two Lagrangian invariant fields. Then, we show that an analogous formulation in terms of Lagrangian invariants applies to the case where the electron response is obtained from a drift-kinetic model.

Sensitivity of kinetic ballooning mode instability to tokamak equilibrium implementations

2016 ◽  
Vol 82 (5) ◽  
Author(s):  
H. S. Xie ◽  
Y. Xiao ◽  
I. Holod ◽  
Z. Lin ◽  
E. A. Belli
Keyword(s):  
Ion Temperature ◽  
Ion Temperature Gradient ◽  
Order Difference ◽  
Ballooning Mode ◽  
Electron Mode ◽  
Tokamak Edge ◽  
Global Equilibrium ◽  
Global Profile ◽  
Shafranov Shift ◽  
Trapped Electron

Global, first-principles study of the kinetic ballooning mode (KBM) is crucial to understand tokamak edge physics in high-confinement mode (H-mode). In contrast to the ion temperature gradient mode and trapped electron mode, the KBM is found to be very sensitive to the equilibrium implementations in gyrokinetic codes. In this paper, we show that a second-order difference in Shafranov shift or geometric coordinates, or a difference between local and global profile implementations can bring a factor of two or more discrepancy in real frequency and growth rate. This suggests that an accurate global equilibrium is required for validation of gyrokinetic KBM simulations.

Turbulent Diffusion of Suspended Particles: Analysis of the Turbulent Schmidt Number

2011 ◽  
Vol 312-315 ◽  
pp. 794-799 ◽  
Author(s):  
Rafik Absi ◽  
Stéphane Marchandon ◽  
Marc Lavarde
Keyword(s):  
Kinetic Model ◽  
Eddy Viscosity ◽  
Schmidt Number ◽  
Open Channel ◽  
Settling Velocity ◽  
Stokes Number ◽  
Open Channel Flows ◽  
Two Phase ◽  
Turbulent Schmidt Number ◽  
Two Fluid

For mass transfer applications, CFD codes need the turbulent Schmidt number . The aim of our study is the analysis of some theoretical closure results and analytical formulations for . We will investigate different formulations of from the basic conservation equations for sediment-water mixtures in turbulent open-channel flows based on a two-fluid description and a kinetic model. The kinetic model for turbulent two-phase flows provides which depends on particle Stokes number. Our study show that the two approaches provide that depends on turbulent kinetic energy (TKE), eddy viscosity and particles settling velocity. For the analysis, accurate analytical formulations for TKE and eddy viscosity calibrated by DNS data are presented.

RELAXATION AND COLLECTIVE MOTION IN SUPERCONDUCTORS. A TWO-FLUID DESCRIPTION

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-488-C6-489 ◽  
Author(s):  
C. J. Pethick ◽  
H. Smith
Keyword(s):  
Collective Motion ◽  
Two Fluid

ULTRASOUND-MODULATED TWO-FLUID ATOMIZATION OF VISCOUS NEWTONIAN LIQUIDS

2003 ◽  
Vol 13 (4) ◽  
pp. 395-412
Author(s):  
Maha Yamak ◽  
Shirley C. Tsai ◽  
Ken Law
Keyword(s):  
Newtonian Liquids ◽  
Two Fluid
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