G-EQDSK file format

G-EQDSK (G-formatted EQuilibrium DiSK) is a file format used to store the data of an equilibrium from EFIT’s reconstruction. This format is widely used by experimentals to share the results of discharges made in tokamaks. The code implemented is based on information scattered all around the internet [1, 2, 3].

G-EQDSK files don’t contain information about the coordinate convention they are using, so people should know beforehand from the file’s source. The COCOS convention defines an index defining the coordinate systems chosen, choice of sign and normalization.

These files can be read with the following function

Equilibrium read_geqdsk(std::string filename)

Read geqdsk (G formatted EQuilibrium DiSK) files

This replicates what’s implemented here: https://github.com/bendudson/freegs/blob/master/freegs/_geqdsk.py and here: https://github.com/bendudson/pyTokamak/blob/master/tokamak/formats/geqdsk.py Read equilibrium G-EQDSK file

Parameters

filename – name of file

Returns

Equilibrium with the read data