A "magnetic" (or "flux") surface is one in which particle orbits remain confined. The only way they move from surface to surface is via colliding with other pa

A "magnetic" (or "flux") surface is one in which particle orbits remain confined. The only way they move from surface to surface is via colliding with other particles, or by being carried away by turbulent fields. I've never heard that "nested" need only refer to a finite number. It's a way to illustrate, with words, how such surfaces relate to a 3d torus. I don't see anything wrong with this.