|
|
|
Citations Index
>>> |
|
Articles With Citations
to Z. Abou-Assaleh
|
|
Theoretical Plasma
Physics |
|
Controlled Thermonuclear Fusion Energy |
| |
|
1993 |
|
|
|
|
|
|
|
1993 |
|
|
|
https://iopscience.iop.org/article/10.1088/0029-5515/35/7/I01/pdf
https://www.researchgate.net/publication/231012461_The_scrape-off_layer_in_a_finite-aspect-ratio_torus_The_influence_of_limiter_position
"The scrape-off layer in a finite-aspect-ratio
torus: the influence of limiter position"
P.J. Harbour and A. Loarte
JET Culham Laboratory (Euratom/UKAEA Fusion
Association) Abingdon, Oxon, 0X14 3DB, UK
Published under licence by IOP
Publishing Ltd
Nuclear Fusion, Volume 35, Number 7
Citation P.J. Harbour and A. Loarte 1995 Nucl. Fusion 35 759
Abstract
The effect on the scrape-off layer (SOL) of
changing the position of a tokamak limiter from the low field side (LFS)
to the high field side (HFS) of the plasma is considered. Conservation of
magnetic flux in the SOL requires that the area, A||, for flow of
particles and energy parallel to the magnetic field, be smaller on the HFS.
The effect that this reduction in A|| has on the SOL is that, when the
limiter is on the HFS, as compared with the LFS, then the characteristic
scrape-off thickness is increased and the plasma particle and energy
densities are higher. Such increases are described. They were observed in
an experiment in JET in which the plasma was limited first on the LFS and
then, during the same discharge, on the HFS. The magnitude of the effect
was larger than expected, with the line integrated density of the SOL, nλn,
having an average increase by a factor of 5.8 ± 1.1 and an increase by a
factor of 7 at the respective limiter. Moreover, there was an increase in
the characteristic scrape-off thickness for power flow, λp, by a factor of
2.5 ± 0.4 on average, and a corresponding increase by a factor of 3.0 at
the respective limiter. Such an increase in n λn can substantially improve
the screening of recycled particles and can increase wall pumping,
although not strongly in the experiments described, which were in helium
to avoid these effects. The large increase in λp measured in JET is useful
in spreading power over a larger area of a limiter on the HFS. Evidence is
presented which suggests that either the observed enhancement of the
effect on the SOL above expectations is due to a reduction in the Mach
number at the limiter sheath when on the HFS or there are fundamental
problems with the modelling procedure usually used for the SOL. Related
experiments are discussed
|
|
|
|
1993 |
| |
|
"Tokamak
divertor modeling with fluid and kinetic codes.
"
David Peter Coster,
Ph.D. dissertation.
PRINCETON UNIVERSITY,
1993 .
|
|
[PDF]
Tokamak divertor modeling with fluid and
kinetic codes.
|
| |
|
1993 |
| |
Physics of Fluids B: Plasma Physics -- May 1993 -- Volume 5,
Issue 5, pp. 1453-1470
|
"Kinetic theory of a nonequilibrium
plasma: Evaluation of the vectorized collisional Boltzmann
equation"
-
Ann W. Morgenthaler
and
Peter L. Hagelstein
-
Department of Electrical Engineering and Computer Science,
Massachusetts Institute of Technology, 38-280, 77
Massachusetts Avenue, Cambridge, Massachusetts 02139
(Received 22 June 1992;
accepted 15 January 1993)
Abstract
Cartesian
velocity moments of the Boltzmann equation are evaluated using
modal solutions to the spherical harmonic oscillator
as a basis set. The nonlinear collision matrix
describing the interaction between any two modes is
evaluated analytically for the Landau collision operator, and
matrix elements describing collisions between identical
particles are calculated for some pairs of
azimuthally symmetric modes. First-order linear transport
coefficients calculated directly from collision
matrix elements are shown to agree
exactly with previously published results; coefficients of
thermal conductivity and viscosity are computed much
more accurately by trivially extending this
calculation. Relaxation times for self-collisions in a
two-dimensional linearized plasma are also computed,
indicating that the plasma equilibrates in roughly
one to ten times the Spitzer self-collision time. The results
obtained in this paper are useful for both analytic and
numerical simulations of nonequilibrium plasmas and an
explicit six-moment model for a one-component
azimuthally symmetric plasma is given. Physics of Fluids B:
Plasma Physics is copyrighted by The American Institute of
Physics.
|
|
Kinetic theory of a nonequilibrium
plasma - Evaluation of the vectorized collisional Boltzmann
equation
|
|
Kinetic theory of a nonequilibrium
plasma - Evaluation of the vectorized collisional Boltzmann
equation
|
|
Kinetic theory of a nonequilibrium
plasma Evaluation of the vectorized collisional Boltzmann
equation
|
| |
| |
| |
|
Citations Index
>>> |
| |
|