Operation of kinetic-inductance travelling wave parametric amplifiers at millimetre wavelengths
Superconductor Science and Technology IOP Publishing 37 (2024) 035006
Abstract:
It is expected that the operation of microwave Kinetic Inductance Travelling Wave Parametric Amplifiers (KITWPAs) can be extended to the millimetre (mm) and the sub-mm wavelength range as long as the frequency is below the gap frequency of the superconducting film. This paper presents possible mm-wave designs for KITWPAs based on microstrip transmission lines. Our device is designed based on the BCS (Bardeen-Cooper-Schrieffer) model which successfully reproduces the measured transmission profile, gain, bandwidth, and nonlinear response of a fabricated KITWPA operating in the Ka-band, and includes the millimetre-wave dielectric loss determined by fitting the quality factor of a Wband microstrip resonator. We suggest a layout for a KITWPA operating near 220 GHz that can be fabricated using the same superconducting properties as the Ka-band device and can be coupled to a waveguide system. We conclude the paper by extending the 220 GHz design to higher frequency regimes approaching 1 THz.Embedding Impedance Recovery in a Twin-Junction SIS Mixer
International Symposium on Space Terahertz Technology Isstt 2024 (2024)
Abstract:
We describe a method for calculating the embedding impedance of an SIS mixer employing twin junction tuning. Calculation of the embedding impedance is done using equivalent transmission line circuits of the mixer, the measured pumped and unpumped IV curves of the mixer chip and the Tucker theory expressions of the tunneling currents. Our simulation method does not require the individual IV curves of the two junctions.Heterodyne Spectrometer Instrument (HSI) for Far-IR Spectroscopy Space Telescope (FIRSST)
International Symposium on Space Terahertz Technology Isstt 2024 (2024)
Abstract:
The Heterdyne Spectrometer Instrument (HSI) is one of two instruments on the Far-IR Spectroscopy Space Telescope (FIRSST) proposal to NASA. It would be the first heterodyne array receiver in space and has 3 frequency bands, each containing two 5-pixel arrays, one per polarizations. HSI uses high TRL (>6) components and is an innovative, but low-risk instrument.Modeling and Testing Superconducting Artificial CPW Lines Suitable for Parametric Amplification
(2023)
Engineering the thin film characteristics for optimal performance of superconducting kinetic inductance amplifiers using a rigorous modelling technique.
Open research Europe Faculty of 1000 2 (2023) 88