We designed two different sensor SQUIDs for the readout of the resonant mass gravitational wave detector MiniGRAIL. Both designs have integrated input inductors in the order of 1.5μ Hand are planned for operation in the mK temperature range. Cooling fins were added to the shunt resistors. The fabricated SQUIDs show a behavior that differs from standard dc-SQUIDs. We were able to operate a design with a parallel configuration of washers at reasonable sensitivities. The flux noise saturated to a value of 0.84μΦ₀/ Hzbelow a temperature of 200 mK. The equivalent noise referred to the current through the input coil is 155fA/ Hzand the energy resolution yields 62.
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Pleikies et al. (2007) studied this question.
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