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Item | Explanation | Unit |
---|---|---|
ATTACHMENT-COEFFICIENT |
Attachment coefficient/pressure | 1/cm.Torr |
DRIFT-VELOCITY |
Drift velocity | cm/microsec |
ION-DISSOCIATION |
Ion dissociation coefficient | 1/cm.Torr |
ION-MOBILITY |
Ion mobility | cm2/microsec.V |
LONGITUDINAL-DIFFUSION |
Longitudinal diffusion * sqrt(p) | cm*sqrt(Torr) for 1 cm |
LORENTZ-ANGLE |
Lorentz angle | degrees |
TOWNSEND-COEFFICIENT |
Townsend coefficient/pressure | 1/cm.Torr |
TRANSVERSE-DIFFUSION |
Transverse diffusion * sqrt(p) | cm*sqrt(Torr) for 1 cm |
Note that the same scalings have to be applied as for the TABLE.
Variable | Meaning | Unit |
---|---|---|
ANGLE_EB |
Angle between E and B | degrees |
ATTACHMENT |
Attachment coefficient / p | 1/cm.Torr |
B |
Magnetic field strength | Tesla |
BOLTZMANN |
Boltzmann constant | 1.380658E-23 J/K |
DISS |
Ion dissociation coefficient | 1/cm.Torr |
ECHARGE |
Electron charge | 1.60217733E-19 C |
EP |
Electric field / p | V/cm.Torr |
LORENTZ |
Lorentz angle | degrees |
MOBILITY |
Ion mobility | cm2/microsec.V |
P |
Pressure | Torr |
SIGMA_L |
Longitudinal diffusion * sqrt(p) | cm*sqrt(Torr) for 1 cm |
SIGMA_T |
Transverse diffusion * sqrt(p) | cm*sqrt(Torr) for 1 cm |
T |
Temperature | K |
TOWNSEND |
Townsend coefficient / p | 1/cm.Torr |
VELOCITY |
Electron drift velocity | cm/microsec |
The variable EP can always be used, ANGLE_EB and B can only be used in tables prepared for magnetic fields. The transport properties can be used only insofar as they have been entered already.
The E/p vector should in principle cover the entire range of the table. If it doesn't, and if the selected item already exists, then values outside the range of the E/p vector are kept. If the E/p range is too short while the selected item doesn't yet exist, then the replacement is refused. No attempt is made to extrapolate the table.
The E/p values in your measurements do not have to coincide with the E/p values present in the table - your measurements will be interpolated at the values of the table and these interpolations are stored instead of the actual measurements.
When the data is smooth, a value of 2 (quadratic interpolation) is a good choice. This may however lead to intermediate points with a negative value in for instance Townsend coefficient tables that usually start at 0. For such tables, linear interpolation is advised.
Instead of ORDER 1, you may also type LINEAR. QUADRATIC is a synonym for ORDER 2, CUBIC for ORDER 3.
Formatted on 0105-10-15 at 17:17.