Title :
Dc- and un-SQUIDs for readout of ac-biased transition-edge sensors
Author :
Kiviranta, Mikko ; Penttila, Jari S. ; Gronberg, Leif ; Seppa, Heikki ; Suni, Ilkka
Author_Institution :
VTT Inf. Technol., Espoo, Finland
fDate :
6/1/2003 12:00:00 AM
Abstract :
We have developed a set of SQUIDs optimized for readout of ac-biased transition edge sensors. Junction shunts are made of Pd and attached to cooling fins to facilitate low-noise operation at sub-kelvin temperatures. SQUID´s have a low loop inductance in order to reach a large natural dynamic range even without negative feedback. The SQUIDs are intended to be used for frequency-domain multiplexing of X-ray calorimeter arrays. Both traditional dc-SQUIDs and novel un-SQUIDs are manufactured. The fabrication process and SQUID design criteria are reviewed.
Keywords :
SQUIDs; X-ray detection; X-ray imaging; calorimeters; inductance; palladium; superconducting device noise; Pd; X-ray calorimeter arrays; ac-biased transition-edge sensors; cooling fins; dc-SQUIDs; fabrication process; frequency-domain multiplexing; junction shunts; loop inductance; low-noise operation; natural dynamic range; negative feedback; readout; sub-kelvin temperatures; un-SQUIDs; Cooling; Dynamic range; Fabrication; Inductance; Manufacturing; Negative feedback; Negative feedback loops; Process design; SQUIDs; Temperature sensors;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.813962
