Replication Data for: Cryogenics and the Cold-Mass Thermal Budget of a High-Field Spherical-Tokamak Breeder: Centrepost Heat Loads, Current Leads, and the 4.5 K Refrigeration Plant
Year: 2026
Type: dataset
Abstract: Replication data for the paper Cryogenics and the Cold-Mass Thermal Budget of a High-Field Spherical-Tokamak Breeder: Centrepost Heat Loads, Current Leads, and the 4.5 K Refrigeration Plant (Kronos Fusion Energy 2026 Publication Series, paper 2.23), published at doi:10.5281/zenodo.22645840. Abstract of the paper. The cold-mass thermal budget decides whether a compact spherical tokamak can be built at all, because the toroidal-field current must pass through the tightest radius in the machine, where current density and neutron flux are simultaneously highest. We report the cryogenic case for the Hyperion breeder (design point I_p=9.66, Q=3.076, P_ fus=85.04, 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) and show that high-temperature superconductivity (HTS) is not an optimisation but a requirement. A fully-resistive centrepost would dissipate ≈282 — 3.3× the fusion power — which is a non-starter; a fully superconducting REBCO centrepost replaces that dissipation with a cryogenic load of order ≈5, a reduction of ≈56×, and a hybrid variant retains only a thin (≈12 %, ≈39) resistive innermost layer as a radiation-immune sacrificial element. We derive the governing cold-mass heat balance from the conduction, radiation, current-lead, joint, and nuclear-heating channels, and show that the classical parasitic leaks close to well below 0.1 at , so the envelope is set by centrepost nuclear heating referred across a staged shield system whose fraction, through the Carnot penalty (T_h/T_c-1)/η_2≈263, controls the cryoplant wall-plug. 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. cryogenics-and-the-cold-mass-thermal-budget-of-a-high-f.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/sektd8
Authors: Ford, P I, Kulcinski, G L
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214678582