6 papers
Microwave Studies of Single Crystal TeO2 at Cryogenic Temperatures
Timothy Holt, Maxim Goryachev, William Campbell +1
We use whispering-gallery-mode analysis to characterise the microwave dielectric properties of single-crystal TeO at cryogenic temperatures and compare its loss performance wit…
A Search for Effects of Cosmic Rays with Multi-scale Entropy Metrics
William M. Campbell, Ben T. McAllister, Eugene N. Ivanov +4
We report a comparison of frequency fluctuations in oven-controlled quartz bulk-acoustic-wave oscillators operated above ground and one kilometre underground in a low-muon-backgrou…
Experimental Limits on Planetary Mass Primordial Black Hole Mergers
William M. Campbell, Leonardo Mariani, Michael E. Tobar +1
The multi-mode acoustic gravitational wave experiment (MAGE) is a high-frequency gravitational wave detection experiment featuring cryogenic quartz bulk acoustic wave resonators op…
Cryogenic Microwave Whispering Gallery Mode Spectroscopy of Paramagnetic Impurities in High-Purity Crystalline LiF
Steven Samuels, William Campbell, Michael E. Tobar +1
A low-noise cryogenic microwave spectroscopy experiment was performed on a high-purity lithium fluoride (LiF) crystal. The spectroscopy data revealed avoided level crossing interac…
Low Temperature Properties of Low-Loss Macroscopic Lithium Niobate Bulk Acoustic Wave Resonators
William M. Campbell, Leonardo Mariana, Sonali Parashar +2
We investigate gram scale macroscopic bulk acoustic wave (BAW) resonators manufactured from plates of piezoelectric lithium niobate. The intrinsic competing loss mechanisms were st…
Upconversion of Phonon Modes into Microwave Photons in a Lithium Niobate Bulk Acoustic Wave Resonator Coupled to a Microwave Cavity
S. Parashar, W. M. Campbell, J. Bourhill +3
The coupling between acoustic vibrations in a lithium niobate bulk acoustic wave resonator and microwave photons of a re-entrant microwave cavity was investigated at a temperature…