Replication Data for: Tritium Permeation-Barrier Coatings for a Compact Spherical-Tokamak Breeder: The Liquid-Lithium-over-Tin Wall-Chemistry Choice
Year: 2026
Type: dataset
Abstract: Replication data for the paper Tritium Permeation-Barrier Coatings for a Compact Spherical-Tokamak Breeder: The Liquid-Lithium-over-Tin Wall-Chemistry Choice (Kronos Fusion Energy 2026 Publication Series, paper 2.50), published at doi:10.5281/zenodo.22645870. Abstract of the paper. The tritium a breeder keeps out of its structure is tritium it keeps in its fuel cycle, and the two decisions that set that balance both live at the first wall: which liquid metal, if any, faces the plasma, and what barrier protects the structure behind it. We resolve both for the Hyperion compact spherical-tokamak breeder (P_ fus=85.04, I_p=9.66, Q=3.076, negative triangularity δ=-0.30, B_0=8, elongation κ=2.0, major radius =1.20, aspect ratio A=2.5, centrepost peak field 16.84). We formalise the coupled fuel-cycle and first-wall transport problem — a McNabb–Foster diffusion–trapping system with Sieverts chemical-potential continuity across a tungsten/steel interface, closed by an implantation source and recombination boundaries — and solve it by finite element (FESTIM/FEniCS) on the actual 0.5 W + 2 Eurofer97 stack as part of the Kronos NVIDIA GPU high-performance-computing campaign. The steady permeation flux is 5.16×10^14 T m^-2s^-1≈0.082 T m^-2fpy^-1, only 0.52–0.60 % of the implanted flux, with ~99.4 % re-emitted; the stack is tungsten-diffusion-limited because the tungsten-to-steel solubility partition is ~2×10^-5, and the finite-element result reproduces the analytic two-layer series-resistance limit to seven significant figures. Being diffusion-limited, the loss flux is temperature-independent and linear in load, so for a ~100 wall it is a bounded ~8–10 T fpy^-1 holdup against a kilogram-scale surplus. 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. tritium-permeation-barrier-coatings-for-a-compact-spher.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/3ezz7f
Author: Ford, P I
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214606128