A high-performance wave guide cryogenic thermal break

Melhuish, S. J.; McCulloch, M.; Piccirillo, L.; Stott, Chloe

doi:10.1063/1.4964475

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…[16][17][18].) The resonators were thermally isolated by multiple stages of Ka band WG thermal breaks [7]; the full WG chain had a total attenuation of around 2 dB when the SC cavities were replaced by a WG through. A photograph of the last stage of thermal isolation is shown in Fig.…”

Section: Cavity Fabrication and Measurement Setupmentioning

confidence: 99%

“…In our case, a circular waveguide (WG) cavity is used to provide a sufficient nonlinearity for parametric processes to take place. Compared to lithographically produced paramps, 3D WG paramps could offer benefits in the form of simplified fabrication methods, physical durability, use of true WG thermal breaks [7] and simpler scalability to frequencies of up to a few hundred GHz and be integrated with systems that use 3D WG in their structure via low-loss transitions. If high gain, frequency tunability of the resonance frequency and near quantum-limited noise performance can be achieved while also isolating the pump tone from the application in question, such 3D WG paramps could be applied directly as the readout of axion detectors such as MADMAX [8] or as readout amplifiers for qubits generated in a 3D circuit quantum electrodynamics (cQED) architectures [9].…”

Section: Introductionmentioning

confidence: 99%

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Parametric Amplification at Ka Band via Nonlinear Dynamics in Superconducting 3D Cavities

et al. 2020

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Modern parametric amplifiers are based on lithographically produced superconducting thin-film planar transmission line structures. These paramps rely on resonant structures with embedded nonlinear elements to stimulate intermodulation with a stronger pump tone that gives rise to signal gain when certain conditions are satisfied. Such paramps have not yet been realised in superconducting 3D waveguide resonators. Possible applications of these devices include detector systems that are based on 3D waveguide such as dark matter detectors and quantum computers. Reported here are the results of an investigation of a 30.64 GHz series circular waveguide resonance machined from bulk niobium showing parametric gain of up to 2 dB in the presence of a stronger pump tone 10 kHz above in frequency. The gain is largest on abrupt jumps of the transmission spectra of the resonance, which may be a result of weak-link formation on the superconducting surfaces.

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Section: Cavity Fabrication and Measurement Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parametric Amplification at Ka Band via Nonlinear Dynamics in Superconducting 3D Cavities

et al. 2020

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“…The cryogenic W-band test setup consists of the device at the 4K stage of a GM cryocooler with a custom-made waveguide feedthrough, which has a thermal break and vacuum window design to deliver the W-band signal to the device based on [29] and [30]. We use a vector network analyzer (VNA) with W-band extenders to perform the measurements.…”

Section: Test Setupmentioning

confidence: 99%

An On-Chip Superconducting Kinetic Inductance Fourier Transform Spectrometer for Millimeter-Wave Astronomy

et al. 2020

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An on-chip FTS consists of two waveguides coupled to long superconducting transmission lines (STLs) (∼ 620 mm) using two coupling probes. The signal propagating on one of the STLs is phase-shifted with respect to the other line with a bias current that affects the nonlinear dependence of kinetic inductance, L k (I) of the STL material. Here we describe the design and simulation of a superconducting on-chip FTS coupled to a dual polarization W-band (90-110 GHz) waveguide. These devices have applications in ground-based and space-based millimeter-wave spectral surveys.

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“…To deliver W-Band signals to and from our device on the 4 K stage of our pulse-tube cooled cryostat, we have developed a custom waveguide feedthrough with thermal break and vacuum window designs based on [23] and [24], respectively. Eliminating the need to precisely align waveguide sections across a gap, our thermal break employs roughly-aligned conical horns separated by 2.5 mm and surrounded by baffling to absorb signal leakage from the gap.…”

Section: Measurement Setupmentioning

confidence: 99%

A Superconducting Phase Shifter and Traveling Wave Kinetic Inductance Parametric Amplifier for W-Band Astronomy

Che¹,

Gordon²,

Day³

et al. 2017

Preprint

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The W-Band (75 − 110 GHz) sky contains a plethora of information about star formation, galaxy evolution and the cosmic microwave background. We have designed and fabricated a dual-purpose superconducting circuit to facilitate the next generation of astronomical observations in this regime by providing proof-of-concept for both a millimeterwave low-loss phase shifter, which can operate as an on-chip Fourier transform spectrometer (FTS) and a traveling wave kinetic inductance parametric amplifier (TKIP). Superconducting transmission lines have a propagation speed that depends on the inductance in the line which is a combination of geometric inductance and kinetic inductance in the superconductor. The kinetic inductance has a non-linear component with a characteristic current, I * , and can be modulated by applying a DC current, changing the propagation speed and effective path length. Our test circuit is designed to measure the path length difference or phase shift, ∆ φ , between two symmetric transmission lines when one line is biased with a DC current. To provide a measurement of ∆ φ , a key parameter for optimizing a high gain W-Band TKIP, and modulate signal path length in FTS operation, our 3.6 × 2.5 cm chip employs a pair of 503 mm long NbTiN inverted microstrip lines coupled to circular waveguide ports through radial probes. For a line of width 3 µm and film thickness 20 nm, we predict ∆ φ ≈ 1767 rad at 90 GHz when biased at close to I * . We have fabricated a prototype with 200 nm thick Nb film and the same line length and width. The predicted phase shift for our prototype is ∆ φ ≈ 30 rad at 90 GHz when biased at close to I * for Nb.

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A high-performance wave guide cryogenic thermal break

Cited by 6 publications

References 2 publications

Parametric Amplification at Ka Band via Nonlinear Dynamics in Superconducting 3D Cavities

Parametric Amplification at Ka Band via Nonlinear Dynamics in Superconducting 3D Cavities

An On-Chip Superconducting Kinetic Inductance Fourier Transform Spectrometer for Millimeter-Wave Astronomy

A Superconducting Phase Shifter and Traveling Wave Kinetic Inductance Parametric Amplifier for W-Band Astronomy

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