Superconducting gain

Intermodulation gain in nonlinear NbN superconducting microwave resonators

We report the measurement of intermodulation gain greater than unity in NbN superconducting stripline resonators. In the intermodulation measurements we inject two unequal tones into the oscillator—the pump and signal—both lying within the resonance band. At the onset of instability of the reflected pump we obtain a simultaneous gain of both the idler and the reflected signal. The measured gain...

Gain, noise and intermodulation in a nonlinear superconducting resonator

*Correspondence: [email protected] 2Nanostructure Physics, Royal Institute of Technology (KTH), Stockholm, Sweden Full list of author information is available at the end of the article Abstract A superconducting microwave resonator is modified with several weak links to make it nonlinear and operated as a phase-insensitive microwave amplifier. Signal gain is demonstrated by intermodulation with a...

Evaluation of High Temperature Superconducting (HTS) Coil Performance Gain for 3T Small Animal MR Imaging

Introduction It has been widely reported that substantial signal to noise ratio (SNR) gain can be achieved through the use of the high-temperature superconducting (HTS) surface coil. Due to its complex and expensive design and construction, computational simulation is an essential design tool [1]. However estimating the likely performance gain of the HTS coil where accurate modelling of importa...

Optimal Fuzzy Gain Scheduling of Pid Controller of Superconducting Magnetic Energy Storage for Power System Stabilization

It is well known that the proportional-integral-derivative (PID) can be applied to solve practical control problems effectively. However, in the face of the high system nonlinearity, the PID controller with fixed parameters may fail to provide satisfactory control performance. To enhance the PID control effect, a new design of the fuzzy gain scheduling of PID controller (FGS-PID) is presented i...

Microstrip Superconducting Quantum Interference Device Amplifiers with Submicron Josephson Junctions: Enhanced Gain at Gigahertz Frequencies