Finite Larmor Radius and Three-Dimensional Effects on the Blobs in the Scrape-Off Layer

2008 ◽  
Author(s):  
D. Jovanović ◽  
P. K. Shukla ◽  
F. Pegoraro ◽  
Padma K. Shukla ◽  
Bengt Eliasson ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Larmor Radius ◽  
Finite Larmor Radius ◽  
Dimensional Effects

scholarly journals Ion Confinement in a Toroidal Heliac

1998 ◽  
Vol 51 (1) ◽  
pp. 67
Author(s):  
J. L. V. Lewandowski
Keyword(s):  
Numerical Simulations ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Larmor Radius ◽  
Collision Term ◽  
Magnetic Topology ◽  
Finite Larmor Radius ◽  
Confinement Mode

A model to describe an unmagnetised plasma in three-dimensional magnetic topology is presented. Ion trajectories are integrated numerically and all finite-Larmor radius effects are retained exactly. A velocity-dependent collision term is included in the equations of motion. Numerical simulations relevant to the low-confinement mode of H1-NF are presented and discussed.

Excitation of Alfvén waves by fast particles in a finite pressure plasma of adiabatic traps

1978 ◽  
Vol 20 (1) ◽  
pp. 137-148 ◽  
Author(s):  
B. I. Meerson ◽  
A. B. Mikhallovskii ◽  
O. A. Pokhotelov
Keyword(s):  
Uniform Magnetic Field ◽  
Alfven Waves ◽  
Larmor Radius ◽  
Alfvén Waves ◽  
Trapped Particles ◽  
Resonance Effects ◽  
Finite Larmor Radius ◽  
Pressure Plasma ◽  
Pressure Stabilization ◽  
Instability Growth

Resonant excitation of Alfvén waves by fast particles in a finite pressure plasma in a non-uniform magnetic field is studied. Plasma compressibility in the wave field is determined both by the curvature of the magnetic lines of force and finite Larmor radius of fast particles. A general expression for the instability growth rate is obtained and analyzed; the applicability of the results obtained in the previous paper has also been studied. The finite pressure stabilization of the trapped particles instability has been found. The bounce-resonance effects are analyzed.

Three-Dimensional Aerodynamic Characteristics of Oscillating Supersonic and Transonic Annular Cascades

1982 ◽  
Author(s):  
M. Namba ◽  
A. Ishikawa
Keyword(s):  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Forces ◽  
Numerical Work ◽  
Dimensional Effects ◽  
Mathematical Expressions ◽  
Strip Theory ◽  
Clear Insight ◽  
Theory Approximation ◽  
Insight Into

A lifting surface theory is developed for unsteady three-dimensional flow in rotating subsonic, transonic and supersonic annular cascades with fluctuating blade loadings. Application of a finite radial eigenfunction series approximation not only affords a clear insight into the three-dimensional structures of acoustic fields but also provides mathematical expressions advantageous to numerical work. The theory is applied to oscillating blades. Numerical examples are presented to demonstrate three-dimensional effects on aerodynamic characteristics. Three-dimensional effects in supersonic cascades are generally small and strip theory predicts local aerodynamic forces as well as total aerodynamic forces with good accuracy. In transonic flow, however, the strip theory approximation breaks down near the sonic span station and three-dimensional effects are of primary importance.

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