Waste-Heat Management

The small neutron and radiation channels still make heat; the burner captures it for cooling, potential reuse, and to keep components in range.

The heat that remains

Direct conversion handles the charged-particle power, but not everything is charged. The 5.44% of fusion power carried by neutrons deposits as heat in the shield and structure, plasma radiation lands on the first wall, and the collectors and magnets shed some heat too. All of it must be removed to keep components within limits.

Where heat is collected

• Neutron heat in the shield around the central cell
• Radiated power on the first wall
• Beam and collector thermal loads at the ends
• Cryoplant and power-electronics losses

A modest, reusable stream

Because this is a small fraction of total power, the cooling loop is far smaller than a thermal plant's condenser system, and much of it can be dry-cooled with air rather than evaporated water — one reason the machine stays near-waterless. On a co-located site the recovered heat is a stream that can be put to use rather than simply dumped.

Waste-heat handling is where the burner's thermal engineering concentrates, precisely because so little power flows this way. The loads are set in the design study by the neutron fraction and radiation model, and they size the coolant loops and the residual, mostly-dry cooling the site needs.

Keeping this stream small and mostly dry-cooled is what preserves the near-waterless character that makes the machine sitable next to load; if the thermal channel grew, the siting advantage would erode, so it is tracked carefully in the design study.