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&GAS: INTERPOLATIONS


item

The table item for which you wish to alter the interpolation method.

Keyword Meaning
ATTACHMENT-COEFFICIENT Attachment coefficient of electrons
DRIFT-VELOCITY Electron drift velocity
ION-MOBILITY Mobility of ions
LONGITUDINAL-DIFFUSION Longitudinal diffusion of electrons
LORENTZ-ANGLE Lorentz angle of electrons
TOWNSEND-COEFFICIENT Townsend coefficient of electrons
TRANSVERSE-DIFFUSION Transverse diffusion of electrons


method

The interpolation method to be used. The basic choice is between cubic splines and polynomial Newton interpolation.

Spline interpolation leads to smooth looking graphs, but tends to oscillate making the method less suited for numerical calculations. Spline interpolation can not be used on the 2-dimensional gas tables that are produced by programs like Magboltz when a magnetic field is present.

The order of polynomial interpolation must be between 1 and the smallest of the two numbers: 10 and number of table entries - 1. Orders larger than 2 are not recommended.

Formats:

INTERPOLATIONS item SPLINES
INTERPOLATIONS item NEWTON order

Method Effect Use
SPLINES Cubic spline interpolation only 1-D
NEWTON n Polynomial interpolation of order n 1-D or 2-D
LINEAR Linear interpolation (= NEWTON 1) 1-D or 2-D
QUADRATIC Parabolic interpolation (=NEWTON 2) 1-D or 2-D
CUBIC Cubic interpolation (=NEWTON 3) 1-D or 2-D


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Formatted on 0100-09-02 at 06:56.