Neoclassical transport simulations with an improved model collision operator

2021 ◽  
Vol 28 (6) ◽  
pp. 064501
Author(s):  
S. Matsuoka ◽  
H. Sugama ◽  
Y. Idomura
Keyword(s):  
Collision Operator ◽  
Neoclassical Transport ◽  
Model Collision ◽  
Improved Model

scholarly journals Evolution Equation and Transport Coefficients of Swarms in Initial Relaxation Processes

1987 ◽  
Vol 40 (3) ◽  
pp. 367 ◽  
Author(s):  
Keiichi Kondo
Keyword(s):  
Evolution Equation ◽  
Transport Coefficients ◽  
Collision Operator ◽  
Operator Method ◽  
Time Dependent ◽  
Relaxation Processes ◽  
Projection Operator Method ◽  
Model Collision ◽  
The Difference ◽  
Dependent Transport

The problem of a swarm approaching the hydrodynamic regime is studied by using the projection operator method. An evolution equation for the density and the related time-dependent transport coefficient are derived. The effects of the initial condition on the transport characteristics of a swarm are separated from the intrinsic evolution of the swarms, and the difference from the continuity equation with time-dependent transport coefficients introduced by Tagashira et al. (1977, 1978) is discussed. To illustrate this method, calculations on the relaxation model collision operator have been carried out. The results are found to agree with the analysis by Robson (1975).

scholarly journals Improved linearized model collision operator for the highly collisional regime

2019 ◽  
Vol 26 (10) ◽  
pp. 102108 ◽  
Author(s):  
H. Sugama ◽  
S. Matsuoka ◽  
S. Satake ◽  
M. Nunami ◽  
T.-H. Watanabe
Keyword(s):  
Collision Operator ◽  
Model Collision ◽  
Linearized Model ◽  
Collisional Regime

Symmetries of and entropy production by transport in toroidal confinement systems

1998 ◽  
Vol 59 (4) ◽  
pp. 695-706 ◽  
Author(s):  
H. SUGAMA ◽  
W. HORTON
Keyword(s):  
Entropy Production ◽  
Transport Process ◽  
Collision Operator ◽  
Positive Definite ◽  
Anomalous Transport ◽  
The Self ◽  
Entropy Production Rate ◽  
Onsager Symmetry ◽  
Neoclassical Transport ◽  
Linearized Collision Operator

A synthesized formulation of classical, neoclassical and anomalous transport in toroidal confinement systems with electromagnetic fluctuations and large mean flows is presented. The positive-definite entropy production rate and the conjugate flux–force pairs are rigorously defined for each transport process. The Onsager symmetries of the classical and neoclassical transport matrices are derived from the self-adjointness of the linearized collision operator. The linear gyrokinetic equation with given electromagnetic fluctuations determines the anomalous fluxes with the quasilinear anomalous transport matrix, which satisfies the Onsager symmetry.

scholarly journals Gyrokinetic simulations of neoclassical transport using a minimal collision operator

2008 ◽  
Author(s):  
G. Dif-Pradalier ◽  
V. Grandgirard ◽  
Y. Sarazin ◽  
X. Garbet ◽  
Ph. Ghendrih ◽  
...  
Keyword(s):  
Collision Operator ◽  
Neoclassical Transport ◽  
Gyrokinetic Simulations

Improved Unlike-Particle Collision Operator for delta-f Drift-Kinetic Particle Simulations

2011 ◽  
Vol 9 (2) ◽  
pp. 231-239
Author(s):  
R. A. Kolesnikov ◽  
W. X. Wang ◽  
F. L. Hinton
Keyword(s):  
Collision Operator ◽  
Particle Simulation ◽  
Particle Collision ◽  
Nonlocal Effects ◽  
Toroidal Plasmas ◽  
Neoclassical Transport ◽  
Particle Simulations ◽  
Impurity Ion ◽  
Ion Species ◽  
Particle Operator

AbstractPlasmas in modern tokamak experiments contain a significant fraction of impurity ion species in addition to main deuterium background. A new unlike-particle collision operator for δf particle simulation has been developed to study the nonlocal effects of impurities due to finite ion orbits on neoclassical transport in toroidal plasmas. A new algorithm for simulation of cross-collisions between different ion species includes test-particle and conserving field-particle operators. An improved field-particle operator is designed to exactly enforce conservation of number, momentum and energy.

A minimal collision operator for implementing neoclassical transport in gyrokinetic simulations

2008 ◽  
Author(s):  
X. Garbet ◽  
G. Dif-Pradalier ◽  
C. Nguyen ◽  
P. Angelino ◽  
Y. Sarazin ◽  
...  
Keyword(s):  
Collision Operator ◽  
Neoclassical Transport ◽  
Gyrokinetic Simulations
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