Controlling plasma heat in a fusion energy power plant: 'Louvers' on fusion device should exhaust gases as hot as a star

Commonwealth Fusion Systems (CFS) is developing a tokamak device called SPARC. The company aims to demonstrate the critical fusion energy milestone of producing more output power than input power for the first time in a device that can scale up to commercial power plant size. However, this achievement is only possible if the plasma doesn't melt the device.