ISDEP is a fusion plasma application programmed and highly optimized in the C language which calculates the trajectories of the particles inside a fusion device in the presence of magnetic and electric fields and collisions with a background plasma of a given temperature and density. 
An impression of the ITER system (about 20 meters high) that is currently under construction in France.
There is a factsheet on ISDEP on EDGES available for download (PDF 5,3 Mbyte)
More information on the ITER project that is supported by ISDEP: Fusion energy: the energy of the future.