Abstract
We have developed a set of dc SQUIDs intended for frequency-domainmultiplexed readout of transition edge sensor (TES) arrays. The firstdesign is based on the Ketchen-style washer, and has exhibited a1.2 × 10−7 Φ0 Hz1/2 flux noise both at 4.2 and 0.43 K. The second design is based on the multiloop structureand utilizes the spoke-terminating resistors which double as junction shunts in order tominimize the excess noise due to the resonance damping. The multiloop device has exhibited a3.5 × 10−7 Φ0 Hz1/2 flux noise level at 4.2 K. The mutual inductances are chosen such that a typical ac-biasedTES-based x-ray calorimeter would need only a moderate amount of negative feedback inorder to handle the dynamic range of the signal.
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