What is a tokamak? And is a spherical tokamak different?

Tokamak Energy's fusion prototype to be built at UKAEA's campus tokamak Abstract The SPARC tokamak is a critical next step towards commercial fusion energy SPARC is designed as a high-field , compact (R0 tokamak HBT-EP is a unique experiment for the investigation of wall-stabilization being the only tokamak device built with adjustable walls and having a vacuum chamber

tokamak A new fusion energy advanced prototype with power plant-relevant magnet technology will be built by Tokamak Energy at UKAEA's Culham Campus,