Understanding Torax equilibrium evolution

[geekygiks]

Hi,

Wanted to understand a couple of things regarding Torax

We provide equilibrium files in geometry section using Chease or other framework, does torax compute time evolving parameters(Te,Ne) based on provided equilibrium file or Equilibrium also evolves with time inside torax.

Thanks.

[theo-brown]

There is no equilibrium update step in TORAX, so the equilibrium is frozen at the one that is externally provided.

The one case that is different is when you provide a sequence of geometries, in which case a smooth interpolation is performed:

A sequence of different geometries at different timesteps can be provided at config, and the various Geometry objects are constructed upon initialization. These are packaged together into a GeometryProvider which, interpolates a new Geometry at each timestep allowing for dynamic time stepping.

Note that this interpolation does not ensure self-consistency - we're not resolving the equilibrium, we're just imposing a new one.

This sort of question should really be in a discussion, so I'll convert it now.

[geekygiks]

Ok. Thanks. I see ur other thread of trying to use Freegsnke output into Torax through IMAS. Seems interesting because thats what we are looking at.

Are you able to use it.?

[theo-brown]

FreeGSNKE doesn't yet support the IMAS outputs that TORAX requires. Kamran (FreeGSNKE dev) is looking into this in the next couple of weeks. In the meantime you can load from EQDSK no problem - you just need to make sure that you convert the FreeGSNKE EQDSK from COCOS7 to COCOS2.