Design Blueprint: A Combined Mu-Metal and Superconducting Shield for a Cryogenic Sensor Enclosure: Layer Budget, Saturation Margin and Residual Field

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24147753): This paper presents a computed design for a combined shield intended for magnetic shielding for cryogenic sensors, with its performance, resource budgets and margins derived from stated assumptions rather than asserted. The headline results are: combined shielding factor of the two mu-metal shells of 1.8e+04 dimensionless; static residual field inside the ferromagnetic shells of 0.00277 microtesla 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.