Finite-element modeling of magnetic shielding for SCUBA-2

Matthew I. Hollister; Michael D. Audley; William D. Duncan; Wayne S. Holland

doi:10.1117/12.671209

27 June 2006 Finite-element modeling of magnetic shielding for SCUBA-2

Matthew I. Hollister, Michael D. Audley, William D. Duncan, Wayne S. Holland

Proceedings Volume 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III; 627522 (2006) https://doi.org/10.1117/12.671209
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

SCUBA-2 is a new wide-field submillimeter camera under construction for the James Clerk Maxwell Telescope on Mauna Kea in Hawaii. SCUBA-2 images simultaneously at 450 and 850 μm using large-scale arrays of superconducting bolometers, with over five thousand pixels at each wavelength. Time division multiplexed readouts and cryogenic amplifiers, both based on superconducting quantum interference devices (SQUIDs), are also used in the design. The SCUBA-2 detector arrays must be well shielded against magnetic fields, since the performance of the bolometers can be seriously affected by the presence of a strong field, and the SQUIDs are themselves sensitive magnetometers. This shielding is to be provided by a combination of high-permeability and superconducting layers on both the ambient temperature and cryogenic stages of the instrument. To optimise and demonstrate the effectiveness of the shielding design, a finite-element modelling method was employed, using the Ansoft^(R) Maxwell 3D^TM package. Although a number of approximations had to be made in the modelling, the finite-element results allow a good estimation of the effectiveness of the shielding at attenuating external magnetic fields to be made. This paper describes the modelling process, outlines the key results and summarises the final shielding design.

Citation Download Citation

Matthew I. Hollister, Michael D. Audley, William D. Duncan, and Wayne S. Holland "Finite-element modeling of magnetic shielding for SCUBA-2", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 627522 (27 June 2006); https://doi.org/10.1117/12.671209

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