- This module implements the Kadomtsev Sawtooth Mixing
Model and the Porcelli Sawtooth Mixing Model
for axisymmetric tokamaks in general geometry. The
module is initialized by calls to "kdsaw_pre_init"
and to "kdsaw_init", the former specifying the mixing
model selection, and the latter providing a grid, the
iota(bar) (1/q) profile, and zone volumes; kdsaw_init
computes the Kadomtsev or Porcelli mapping and stores
it in the module's internal memory. Subsequent calls
are used to extract specific information about the
sawtooth mixing. The grid passed to kdsaw_init is specified
in normalized square-root-toroidal-flux, a coordinate
which functions in a way strictly analogous to the
minor radial coordinate "r" in Kadomtsev's original
paper, but is suitable for general geometry. The grid
is given explicitly and need not be evenly spaced.
The current profile is expressed as (1/q), and the
zone volumes (in any suitable units) are used to adjust
the mapping such that a change in a particle or energy
density profile according to the ideal Kadomtsev mapping
volume integrates to precisely zero: typically, a peaked
density profile is flattened, with the density reduced
in the center and raised at the edge of the mixing
region. A user-adjustable current profile remapping
is also provided.
Both REAL and REAL*8 interfaces
are provided to all routines in the module.
Sov. J. Plasma Phys. Vol. 1 No. 5 Sept. Oct. 1975,
 Porcelli et al., Plasma Physics &
Controlled Fusion 38 (1996) p. 2163, (See section 4).
- Thr Jun 18 16:54:09 2009
- MHD Stability
- Saw Tooth, Tokamak
- Fortran 90
- Doug McCune
- Review Information
- NTCC Review of kdsaw Module
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