It is an artistic, yet quite accurate 3D model of a tokamak type fusion reactor.
The inner diameter of the fusion chamber is ~12m, which is about the size of "ITER".
Modell: TOKAMAK fusion reactor
Blender version: 2.91.2
Render Engin: Cycles (Main) / Eevee
Polycount: ~800K per segment (6)
There are two scenes.
In the first scene is the funsion reactor.
In the second is a shader that simulates small plasma stripes.
In the collection "Plasma" the plasma is blended with a boolean of a surface - this can slow down the viewport!