S74 — Lengyel impurity-seeding detachment window

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S74: Lengyel impurity-seeding detachment window. Tier-1 · reduced-order, part of the Kronos MetroVolt 81-analysis validation record (DOI 10.5281/zenodo.21746479).

Register ID

S74

Campaign

Third-pass review-response

Status

Tier-1 · reduced-order

Deposit

DOI 10.5281/zenodo.21746479

S74 concerns the divertor and plasma-facing components — the plant's exhaust system, which must survive rocket-nozzle-class heat flux.

What the register records

Detachment window contingent on Super-X flux expansion F_x~3-4× (within MAST-U's demonstrated 5-10×). Tier-2: SOLPS-ITER.

This is a register summary of a deposited analysis; its title and notes quote the deposit as-run, so parameters here may reflect the pre-Mode-D basis where they differ — all operating claims cite the frozen Mode-D point (ratified 24 July 2026). Full input decks, scripts, and output data for every analysis S01–S81 are released openly under CC BY 4.0 at DOI 10.5281/zenodo.21746479.