Design Blueprint: A Niobium Superconducting Magnetic Shield for a Low-Field Measurement Laboratory: Sizing, Residual Field and Mass Budget

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24147694): This paper presents a computed design for a niobium shield intended for low-field magnetic measurement, with its performance, resource budgets and margins derived from stated assumptions rather than asserted. The headline results are: residual interior field change for a 50 microtesla external change of 0.25 nT; budgeted trapped-flux offset after a low-field cooldown of 10 nT; combined residual fi 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.