## NSCRUNCH

**Abstract**
- A program to compute the moment (Fourier) expansion
of a parametric two-dimensional grid representation.
The moment expansion is computed at some critical surfaces,
in general the first (non-singular) and last, and then
interpolated across the grid. A constrained variational
principle is applied to determine numerically the optimal
parametric angle that minimizes the width of the power
spectrum. at the first non-singular and last radial
surface. Input data are two rank-one grid arrays (xin1d,
yin1d) of size nt*ns, where nt is the number of poloidal
points and ns the number of radial surfaces. Indices
first iterate over the poloidal nodes and then over
the radial surfaces: e.g. xin1d(k), k=(j-1)*nt + i,
represents the "x" points at the i-th poloidal node
and j-th radial surface. Output data are the COS and
SIN radially dependent coefficients of "x" and "y".
**DateOfInformation**
- Thr Jun 18 16:55:48 2009
**Domain**
- Numerical Tools
**Keyword**
- Moment, Fourier, parametric representation, minimization of the power spectrum width
**Language**
- Fortran 90
**Name**
- NSCRUNCH
**TargetEnvironment**
- AIX, CRAY J90, HP-UX, IRIX64, Linux, OSF1, SunOS
**Webpage**
- https://w3.pppl.gov/NTCC/Nscrunch
**ContactIs**
- Alexander Pletzer

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