Design Blueprint: An Adiabatic Demagnetisation Refrigerator Stage: Salt-Pill Entropy Budget, Hold Time and Magnet Requirements

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24147793): This paper presents a computed design for a adiabatic demagnetisation stage intended for magnetic refrigeration at low temperature, with its performance, resource budgets and margins derived from stated assumptions rather than asserted. The headline results are: usable entropy change of the pill between magnetised and demagnetised states of 9.34 J per K; cooling capacity at the 100 mK operating po Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.