Housing and Shielding Design for a Superconducting Quantum Interference Sensor Array: Shielding Requirement, Thermal Load and Johnson Noise Budget

This paper presents a computed design for a SQUID array housing intended for SQUID sensor systems, with its performance, resource budgets and margins derived from stated assumptions rather than asserted. The headline results are: shielding factor required to bring ambient fluctuation to the sensor noise target of 4e+05 dimensionless; achieved shielding factor of the derated layered enclosure with liner of 7.5e+06 dimensionless; ratio of achieved to required shielding of 18.8 dimensionless; johnson-noise field from the superconducting liner at the stated distance of 2.2 fT per root hertz; total cryogenic load of the housed array of 22.7 mW. Each figure was produced by the deposited computation from the inputs listed in the Methods, and the sensitivity of the conclusions to those inputs is examined in the Discussion. The design is a paper study: it is labelled, on its face and in this abstract, SIMULATED, NOT MEASURED, and no quantity reported here is a measurement of built hardware.