read_cross_text

PlasmaCalcs.quantities.collisions.cross_section_tools.read_cross_text(filename)

reads cross sections from text file.

returns a dictionary with keys ‘kT’, ‘cross’.

kT = Temperature [eV]. array of values

cross = cross section [crossunits]. array of values

crossunits = conversion factor; cross * crossunits = cross section [cm^-2]. single value.

raises FileContentsError if file is invalid.

Text file should look like:

; any number of blank lines or lines with comments (starting with ‘;’),

; at any point in the file, are permitted.

; ALWAYS ignores any portion of a line after a ‘;’

1.0e-16 ; a single number. this is the “crossunits”.

; Cross sections in this file represent value [cm^-2] = (value in file) * crossunits

; E (eV) (ignored values) cross section [crossunits]

0.100 -1.0000 33.873

0.297 -1.0000 33.350

0.801 -1.0000 26.996

1.306 -1.0000 22.475

1.647 -1.0000 20.092

1.988 -1.0000 17.587

; … etc. Values above are just an example

; any nonzero amount of whitespace between values is allowed.

; Extra values (more than 3 values per line) are allowed, but ignored if provided.