Abstract
The performance of transition-edge sensors (TES) and their SQUID multiplexed readouts is very sensitive to ambient magnetic field and its fluctuations. In order to run ground experiments on thousands of X-ray TES microcalorimeters with a small uniform ambient magnetic field (< 1 μT, with a uniformity < 0.1 μT), we need a very low ambient field to be trapped into the superconducting magnetic shields. We have designed a sub-Kelvin test platform to reach these specifications. For this purpose, we modeled a new design for the shielding consisting of a series of different mu-metal and superconducting shields, including a niobium shield at 50 mK, a cryoperm (A4K) shield at 3 K, and a mu-metal shield at 300 K. A magnetic field coil is used to vary the local perpendicular magnetic field over the TES array. To optimize this field, we have studied a number of different field-coil designs and the impact of the different shield geometries, in order to reach the required field uniformity.
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Miniussi, A.R., Adams, J.S., Bandler, S.R. et al. Design of Magnetic Shielding and Field Coils for a TES X-ray Microcalorimeter Test Platform. J Low Temp Phys 194, 433–442 (2019). https://doi.org/10.1007/s10909-018-02131-0
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DOI: https://doi.org/10.1007/s10909-018-02131-0