The exhaust problem, live: a two-point edge model computes the target heat flux and
temperature as you change SOL power, flux-channel width, connection length and detachment. Unmitigated, the
parallel load is enormous — this is why detachment exists. This is a reduced-order surrogate that
SOLPS / BOUT++ retire; it establishes the datum (study H9) rather than reproducing a frozen one.
Honest gate Steady-state tungsten tolerates roughly 10 MW/m² at the target.
The two-point model here reduces the parallel flux only by detachment — real flux expansion and plate tilt
(which SOLPS / BOUT++ resolve) buy the rest. Gap-closer: no prior anchor; the real edge codes establish the
target load (study H9, exhaust & divertor engineering).