Maintenance and Access
The linear machine opens at its ends, and the low activation from the 5.44% neutron fraction keeps much maintenance hands-on.
Built to be serviced
Availability depends on being able to inspect and replace components quickly. The burner's linear geometry helps: the machine is a straight line with open ends, so major components — the direct converter, expander internals, and end plugs — are reachable by moving along the axis rather than working through the congested ports of a torus.
Low activation eases access
- The 5.44% neutron fraction keeps induced activation modest
- Low-activation materials shorten cooldown before hands-on work
- Modular units can be serviced while others run
- Straight-line access simplifies component removal and reinstallation
Component lifetimes drive the schedule
The parts that wear are the plasma-facing and high-flux components: the first wall, the collector electrodes, and to a lesser degree the near-plasma magnets. Their design lifetimes set the maintenance cadence and, with it, the site's availability. Designing these as replaceable modules keeps outages short.
Because the machine is a design study, maintenance procedures are planned rather than demonstrated, informed by mirror-program experience and the breeder's engineering. The test unit is where real component lifetimes and service times are first measured, feeding the availability case for fielded units.
Designing for maintainability from the start — replaceable modules, straight-line access, and low activation — is how a fusion machine turns from a physics experiment into a plant that can hold a high capacity factor over years of service.