Atomic physics

Currently the following atomic physics processes are modeled, usually using coefficients from OpenADAS ([[adas|Brief overview]]):

Neutrals:

• Line radiation: energy sink for background plasma.
• Ionization: kinetic neutral -> background fluid ion.
• Recombination: background fluid ion -> kinetic neutral.
• Charge-exchange: modeled here as elastic collision between a background fluid- and kinetic ion, changes particle velocity and contributes to parallel momentum coupling term.
• Neutral neutral collisions

Impurities:

• Radiation: including line radiation, Bremsstrahlung and contribution from recombination.
• Ionization: increases charge state by one.
• Recombination: decreases charge state by one.
• Collisions: currently binary collisions with the background plasma ions, resulting in neoclassical effects.