Abstract
We describe a liquid helium cryostat, developed to cool SQUID-based receivers in low field MRI systems. The cryostat has a 4L liquid helium capacity, a hold time of over 3 days and accommodates 10cm diameter receiver coils. New vacuum insulation methods reduce the noise level by at least an order of magnitude compared to existing commercial designs. The minimum detectable field at 425kHz, with a 5cm diameter circular coil, was estimated to be 0.018fT/Hz1/2 from Q-factor measurements and 0.035fT/Hz1/2 by direct measurement with a SQUID amplifier. Further measurements indicated that most of this field noise probably originates with dielectric losses in the cryostat’s fibreglass shells.
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