The REBCO Magnet Paper

The high-field design points both machines assume depend on rare-earth barium copper oxide superconductors, documented in their own peer-facing paper.

Why a separate magnet paper

Both machines are built around fields that only high-temperature superconductors make plausible: the breeder's 16.84 T peak field and the burner's 26.49 T plug. Rather than assert those numbers, Kronos published a dedicated paper on the rare-earth barium copper oxide (REBCO) magnet basis, so the enabling technology can be judged on its own terms.

What the paper covers

• The superconductor choice and the field levels each machine's design point requires.
• How field, stress, and geometry trade against one another in a high-field coil.
• The stress margins that turn into an honest gate when a coil is pushed past them.

Where it connects to a gate

The magnet physics is exactly where the burner's hardest gate lives. At the burner's design bore, the plug coil is overstressed by roughly 3–3.9x — infeasible as specified. That is not an economic statement; it is a structural one, and it is stated in the open so that any reader can see the coil, not the marketing, is the limit. See the plug-coil gate.

An honest but enabling result

The magnet paper is a case study in the whole open-science posture: the same technology that makes the breeder's field credible also draws a hard line under the burner as currently specified. Publishing both facts in one place lets readers weigh them together. The deposit and DOI (REBCO) are catalogued on the DOI map.

Magnets are the backbone of both designs, and their limits are published rather than assumed away.