Abstract
We have developed a set of dc SQUIDs intended for frequency-domain
multiplexed readout of transition edge sensor (TES) arrays. The first
design is based on the Ketchen-style washer, and has exhibited a 1.2 × 10−7 Φ0 Hz1/2
flux noise both at 4.2 and 0.43 K. The second design is based on the
multiloop structure and utilizes the spoke-terminating resistors which
double as junction shunts in order to minimize the excess noise due to
the resonance damping. The multiloop device has exhibited a 3.5 × 10−7 Φ0 Hz1/2
flux noise level at 4.2 K. The mutual inductances are chosen such that
a typical ac-biased TES-based x-ray calorimeter would need only a
moderate amount of negative feedback in order to handle the dynamic
range of the signal.
Original language | English |
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Pages (from-to) | 285 - 289 |
Number of pages | 5 |
Journal | Superconductor Science and Technology |
Volume | 17 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2004 |
MoE publication type | A1 Journal article-refereed |
Keywords
- SQUID
- washer
- transition edge sensor
- bipolar transistors
- superconducting transistors