4 research outputs found
Parametric amplification via superconducting contacts in a Ka band niobium pillbox cavity
Superconducting parametric amplifiers are commonly fabricated using planar
transmission lines with a non-linear inductance provided by either Josephson
junctions or the intrinsic kinetic inductance of the thin film. However, Banys
et al. [1] reported non-linear behaviour in a niobium pillbox cavity,
hypothesising that below Tc, the pair iris-bulk resonator would act as a
superconducting contact surface exploiting a Josephson-like non-linearity. This
work investigates this effect further by applying Keysight Technologies'
Advanced Design System (ADS) to simulate the cavity using an equivalent circuit
model that includes a user defined Josephson inductance component. The
simulations show that for a resonance centred at nu0 = 30.649 GHz, when two
tones (pump and signal) are injected into the cavity, mixing and parametric
gain occur. The maximum achievable gain is explored when the resonator is taken
to its bifurcation energy. These results are compared to cryogenic measurements
where the pump and signal are provided by a Vector Network Analyzer
Millimetre Wave Kinetic Inductance Parametric Amplification using Ridge Gap Waveguide
We present the design and simulation methodology of a superconducting
ridge-gap waveguide (RGWG) as a potential basis for mm-wave kinetic inductance
travelling wave parametric amplifiers (KI-TWPAs). A superconducting RGWG was
designed using Ansys HFSS to support a quasi-TEM mode of transmission over a
bandwidth of 20 to 120 GHz with its internal dimensions optimised for
integration with W-band rectangular waveguide. A design of an impedance loaded
travelling wave structure incorporating periodic perturbations of the ridge was
described. A method to simulate the nonlinear kinetic inductance via
user-defined components in Keysight's ADS was outlined, which yielded the power
dependent S-parameters and parametric signal gain. A RGWG with a 30 nm NbTiN
coating and 5 um conductor spacing, corresponding to a kinetic inductance
fraction was used for the description of a KI-TWPA with 900
perturbations equivalent to a physical length 25 cm that achieved more than 10
dB of signal gain over a 75--110 GHz bandwidth via 4-wave mixing (4WM).Comment: 9 pages, 3 figures, submitted to the 19th International Workshop on
Low Temperature Detectors (LTD19) Proceeding
Parametric amplification via superconducting contacts in a Ka band niobium pillbox cavity
Superconducting parametric amplifiers are commonly fabricated using planar
transmission lines with a non-linear inductance provided by either Josephson
junctions or the intrinsic kinetic inductance of the thin film. However, Banys
et al. [1] reported non-linear behaviour in a niobium pillbox cavity,
hypothesising that below Tc, the pair iris-bulk resonator would act as a
superconducting contact surface exploiting a Josephson-like non-linearity. This
work investigates this effect further by applying Keysight Technologies'
Advanced Design System (ADS) to simulate the cavity using an equivalent circuit
model that includes a user defined Josephson inductance component. The
simulations show that for a resonance centred at nu0 = 30.649 GHz, when two
tones (pump and signal) are injected into the cavity, mixing and parametric
gain occur. The maximum achievable gain is explored when the resonator is taken
to its bifurcation energy. These results are compared to cryogenic measurements
where the pump and signal are provided by a Vector Network Analyzer