[feniv]

Not the same reactor, but this high speed video gives a great perspective inside a fusion reactor.

https://youtu.be/IhHsOwLdCu4

[wiz21c]

This video is so scifi.... Moreover I don't know why my gut feeling was "it looks so reassuring"... Do you know why it pulses ? And what are the little point-lights running around from time to time ?

[superkuh]

The little lights are probably tiny bits of metal dust or slivers exploding off the walls due to local electrical potentials.