&GAS: OPTIONS

GAS-PLOT

Switching on this option requests plots of the drift velocity, the ion mobility, the diffusion coefficients, the Lorentz angle, the Townsend coefficient, the attachment coefficient, the ion dissociation coefficient, and of the excitation and ionisation rates to be produced.

If SRIM data has been entered, then in addition the energy loss, range and straggling parameters are plotted.

These plots are made when the gas section is left, not when the option is switched on. Use e.g. &MAIN to close the section. Once outside the gas section, the plots can be obtained by entering the &OPTIMISE section and issued a PLOT-GAS command.

The representations used in the graphs are the following:

Drift velocity: In the absence of a magnetic field, only the drift velocity is shown, using polyline representation FUNCTION-1. If the magnetic field is not zero, then the component parallel with E uses FUNCTION-1, the component parallel with the orthogonal part of B uses FUNCTION-2 while the component parallel with E\×B is shown using FUNCTION-3.
Ion mobility: The ion mobility curve is drawn with FUNCTION-1.
Diffusion: The longitudinal diffusion uses FUNCTION-1 while the transverse diffusion uses FUNCTION-2.
Multiplication: The Townsend coefficient is drawn with FUNCTION-1, the attachment coefficient is shown using FUNCTION-2 and the ion dissociation coefficient is shown using FUNCTION-3.
Cluster size: the cluster size distribution is drawn with FUNCTION-1.
SRIM: the SRIM total energy loss is shown with FUNCTION-1, the electromagnetic energy loss with FUNCTION-2, and the nuclear energy loss with FUNCTION-3.
SRIM: the SRIM projected range uses FUNCTION-1, the longitudinal straggling FUNCTION-2 and the transverse straggling FUNCTION-3.
Excitation and ionisation: the excitation rates use FUNCTION-1 and the ionisation rates use FUNCTION-2.

[These graphs are not made by default.]

With the PLOT-OPTIONS command, you have further control over the axes (linear or logarithmic) and the vertical scale of these plots. This command also enables you to suppress one or more of the plots.

Use the ATTACHMENT, DRIFT_VELOCITY, GET_E/P_TABLE, ION_MOBILITY, LONGITUDINAL_DIFFUSION, LORENTZ_ANGLE, TOWNSEND, TRANSVERSE_DIFFUSION, VELOCITY_E, VELOCITY_BTRANSVERSE, VELOCITY_ExB, EXCITATION_RATE and IONISATION_RATE procedures for fully customised plots.

[This option is off initially, its setting is remembered from one gas section to the next.]

GAS-PRINT

This option is responsible for making a printout of all available information on the gas.

The tables are printed when the gas section is being left, not when the option is switched on. Use e.g. &MAIN to close the section. As a consequence, if you wish to output the tables to a file, then you have to start the re-routing just before leaving the section and revert to normal output once you are in the next section:

Once outside the gas section, this table can be obtained by entering the &OPTIMISE section and issued a PRINT-GAS command.

&GAS
magboltz argon 80 co2 20
opt gas-print
> Ar_80_CO2_20.print
&MAIN
>

The output can not be used directly as input to the program, use the WRITE instruction for that purpose.

[This option is off initially, its setting is remembered from one gas section to the next.]

Go to the top level, to &GAS, to OPTIONS, to the topic index, to the table of contents, or to the full text.

Formatted on 21/01/18 at 16:55.