For Deuterium-Tritium reactions, the easiest to achieve, 80% of the energy is contained in neutrons which pass through the first wall and must be captured in a

For Deuterium-Tritium reactions, the easiest to achieve, 80% of the energy is contained in neutrons which pass through the first wall and must be captured in a blanket. The rest of the energy could be carried to the first wall by photons, called radiative cooling, but you can also use divertors that allow the fusion products to escape the plasma carrying away some of the heat. I think in a stellarator you will need divertors to remove the fusion products because of the continuous operation.