S78 — Toroidal-field (B0/R_c) lever
S78: Toroidal-field (B0/R_c) lever. Design-space study (forward-looking), part of the Kronos MetroVolt 81-analysis validation record (DOI 10.5281/zenodo.21746479).
- Register ID
- S78
- Campaign
- Design-space studies (forward-looking)
- Status
- Design-space study (forward-looking)
- Deposit
- DOI 10.5281/zenodo.21746479
S78 tests the high-field magnet system — the REBCO conductor, its structural loads, and its protection — that lets a compact tokamak reach a 24.42 T peak field.
What the register records
A constraint-checked upgrade (NOT a change to the frozen point): R_c 1.40→1.44 m and B0 6.0→6.11 T holds peak conductor field at the demonstrated 24.4 T while improving Troyon and kink margins; the freed β_N headroom can instead buy +6% Pfus (2409→2557 MW) at unchanged H98.
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.