Title :
Tightly coupled dc SQUIDs with resonance damping
Author :
Ono, R.H. ; Koch, J.A. ; Steinbach, A. ; Huber, M.E. ; Cromar, M.W.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We have reduced the effect of resonances on washer style dc SQUIDs coupled to input flux transformers and analyzed our damping structures using a distributed circuit model. A resistance of 1/spl Omega/ is placed across each turn of a 137-turn coil coupled to a planar washer dc SQUID reducing the structure in the voltage-flux curve thus extending the range of current biases over which the device operates. The energy sensitivity of the SQUID is predicted to not be degraded by the intracoil resistors.
Keywords :
SQUIDs; damping; superconducting transformers; coupled planar washer DC SQUIDs; current bias; distributed circuit model; energy sensitivity; flux transformer; intracoil resistor; resonance damping; voltage-flux characteristics; Coils; Coupled mode analysis; Coupling circuits; Damping; Degradation; RLC circuits; Resistors; Resonance; SQUIDs; Transformers;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
