Replication Data for: A Divertor-Exhaust Concept Down-Select for a Compact Spherical-Tokamak Breeder: Super-X, Snowflake, X-Point-Target, and Liquid-Metal Geometries Ranked by Peak Heat Flux and Detachment Window
Year: 2026
Type: dataset
Abstract: Replication data for the paper A Divertor-Exhaust Concept Down-Select for a Compact Spherical-Tokamak Breeder: Super-X, Snowflake, X-Point-Target, and Liquid-Metal Geometries Ranked by Peak Heat Flux and Detachment Window (Kronos Fusion Energy 2026 Publication Series, paper 2.38), published at doi:10.5281/zenodo.22645933. Abstract of the paper. The exhaust of a compact, high-power-density spherical tokamak is a down-select problem before it is an engineering one: the parallel heat flux entering the scrape-off layer is two orders of magnitude above what an actively cooled plasma-facing component can accept, and the resolution is a stack of levers rather than a single clever geometry. We evaluate the full advanced-divertor menu for the Hyperion breeder (design point Q=3.076, P_ fus=85.04 MW, I_p=9.66 MA, δ=-0.30, B_0=8 T, κ=2.0, =1.20 m, aspect ratio A=2.5, centrepost peak field 16.84 T) against a common upstream boundary reconstructed from a reduced two-point model with an Eich heat-flux width (=0.21 mm, =27.4 GW m^-2), and rank every option by delivered target heat flux and by detachment robustness. We write the governing scrape-off-layer transport, the geometric flux-expansion scalings for each candidate, the Lengyel impurity-radiation integral, and the liquid-metal vapor-box evaporation limit as explicit equations, and we cast the down-select as two figures of merit: a closure margin M=q_ cool/q_ t and a Monte-Carlo detachment robustness P_ close. Geometry alone takes the unmitigated attached target from 1370 MW m^-2 (conventional single null) to 171 MW m^-2 (Super-X, an 8× reduction), and a double null splits the residual a further 1.8× (8.04.4 MW m^-2). What this dataset contains data/key_values.csv and data/anchors.json: the frozen design-point values quoted in the paper (symbol, value, unit, provenance), in machine-readable form. data/verification.csv: the validator gates the paper cites, each with its verdict and a link to a live recompute page. figures/: the figures from the paper, as vector PDF, with an inventory. a-divertor-exhaust-concept-down-select-for-a-compact-sp.data-methods.pdf: methods, the computational codes used, and the full value table. data/data_dictionary.md: column definitions. Every value is a frozen design-point number that is independently re-run and recorded in the Kronos Physics De-Risking Register (doi:10.5281/zenodo.22645689). The paper itself is not duplicated here; read it at the DOI above.
Source: Harvard Dataverse
DOI: 10.7910/dvn/c93atm
Author: Ford, P I
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214655082