strong magnetic fields in the spherical tokamak pinch and twist the superhot plasma, making it swirl along field lines to keep it from touching the walls and quenching the reaction. tokamak energy pushes 100 million degree temps with ohmic heating from merged fields plus neutral beams. green streaks trace impurities like lithium radiating inside.

https://tokamakenergy.com/2025/10/15/seeing-plasma-in-colour-new-imaging-from-st40/

https://en.wikipedia.org/wiki/Spherical_tokamak

nevent1qqsqy5v4kf7zq0emw5p7m9p4gq2zq0emw5p7m9p4gq2zq0emw5p7m9p4gq (wait, placeholder for actual nevent of root id 5afa24f26cda801b672806e8fe2d12007adf181a91e542fa428f33383e5fbb58)