S. J. Cooper
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View article: Advancing Sustainable Pavements: Life Cycle Assessment and Global Warming Potential Benchmarking for Asphalt Mixtures in Louisiana
Advancing Sustainable Pavements: Life Cycle Assessment and Global Warming Potential Benchmarking for Asphalt Mixtures in Louisiana Open
Transportation-related greenhouse gas (GHG) emissions in Louisiana have risen significantly, yet the environmental impacts of asphalt mixture production remain underexplored. This study conducted a cradle-to-gate environmental life cycle a…
View article: Integration of High-performance Compact Interferometric Sensors in a Suspended Interferometer
Integration of High-performance Compact Interferometric Sensors in a Suspended Interferometer Open
Homodyne Quadrature Interferometers (HoQIs) are compact, low noise and high dynamic range displacement sensors designed for use in gravitational wave observatories. Their lower noise compared to the displacement sensors used at present mak…
View article: Integration of high-performance compact interferometric sensors in a suspended interferometer
Integration of high-performance compact interferometric sensors in a suspended interferometer Open
Homodyne Quadrature Interferometers (HoQIs) are compact, low noise and high dynamic range displacement sensors designed for use in gravitational wave observatories. Their lower noise compared to the displacement sensors used at present mak…
View article: Beyond slurry cast: Patterning of a monolithic active material sheet to form free-standing, solvent-free, and low-tortuosity battery electrodes
Beyond slurry cast: Patterning of a monolithic active material sheet to form free-standing, solvent-free, and low-tortuosity battery electrodes Open
Commercial lithium-ion battery electrodes today are manufactured by slurry casting active material powder onto a metal current collector foil. This manufacturing process has become embedded over recent decades but limits commercial cell pe…
View article: Design and sensitivity of a 6-axis seismometer for gravitational wave observatories
Design and sensitivity of a 6-axis seismometer for gravitational wave observatories Open
We present the design, control system, and noise analysis of a 6-axis seismometer comprising a mass suspended by a single fused silica fiber. We utilize custom-made, compact Michelson interferometers for the readout of the mass motion rela…
View article: Laser frequency stabilization with the use of homodyne quadrature interferometers
Laser frequency stabilization with the use of homodyne quadrature interferometers Open
Laser frequency stabilization is a crucial technique for precision metrology. We demonstrate laser frequency control using a compact, interferometric sensor, specially modified for sensitivity to laser frequency noise. This setup achieves …
View article: Design and sensitivity of a 6-axis seismometer for gravitational wave observatories
Design and sensitivity of a 6-axis seismometer for gravitational wave observatories Open
We present the design, control system, and noise analysis of a 6-axis seismometer comprising a mass suspended by a single fused silica fibre. We utilise custom-made, compact Michelson interferometers for the readout of the mass motion rela…
View article: Searching for the causes of anomalous Advanced LIGO noise
Searching for the causes of anomalous Advanced LIGO noise Open
Advanced LIGO and Advanced Virgo have detected gravitational waves from astronomical sources to open a new window on the Universe. To explore this new realm requires an exquisite level of detector sensitivity, meaning that the much stronge…
View article: Reducing control noise in gravitational wave detectors with interferometric local damping of suspended optics
Reducing control noise in gravitational wave detectors with interferometric local damping of suspended optics Open
Control noise is a limiting factor in the low-frequency performance of the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO). In this paper, we model the effects of using new sensors called Homodyne Quadrature Interferome…
View article: Sensors and actuators for the advanced LIGO A+ upgrade
Sensors and actuators for the advanced LIGO A+ upgrade Open
Advanced Laser Interferometer Gravitational-wave Observatory (LIGO A+) is a major upgrade to LIGO—the Laser Interferometer Gravitational-wave Observatory. For the A+ project, we have developed, produced, and characterized sensors and elect…
View article: The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the properties of the LOFAR pulsar discoveries
The LOFAR Tied-Array All-Sky Survey: Timing of 35 radio pulsars and an overview of the properties of the LOFAR pulsar discoveries Open
The LOFAR Tied-Array All-Sky Survey (LOTAAS) is the most sensitive untargeted radio pulsar survey performed at low radio frequencies (119−151 MHz) to date and has discovered 76 new radio pulsars, including the 23.5-s pulsar J0250+5854, whi…
View article: A vertical inertial sensor with interferometric readout
A vertical inertial sensor with interferometric readout Open
High precision interferometers such as gravitational-wave detectors require complex seismic isolation systems in order to decouple the experiment from unwanted ground motion. Improved inertial sensors for active isolation potentially enhan…
View article: Active platform stabilization with a 6D seismometer
Active platform stabilization with a 6D seismometer Open
We demonstrate the control scheme of an active platform with a six degree of freedom (6D) seismometer. The inertial sensor simultaneously measures translational and tilt degrees of freedom of the platform and does not require any additiona…
View article: ETpathfinder: a cryogenic testbed for interferometric gravitational-wave detectors
ETpathfinder: a cryogenic testbed for interferometric gravitational-wave detectors Open
The third-generation (3G) of gravitational wave observatories, such as the Einstein Telescope (ET) and Cosmic Explorer, aim for an improvement in sensitivity of at least a factor of ten over a wide frequency range compared to the current a…
View article: A vertical inertial sensor with interferometric readout
A vertical inertial sensor with interferometric readout Open
High precision interferometers such as gravitational-wave detectors require complex seismic isolation systems in order to decouple the experiment from unwanted ground motion. Improved inertial sensors for active isolation potentially enhan…
View article: Active platform stabilisation with a 6D seismometer
Active platform stabilisation with a 6D seismometer Open
We demonstrate the control scheme of an active platform with a six degree of freedom (6D) seismometer. The inertial sensor simultaneously measures translational and tilt degrees of freedom of the platform and does not require any additiona…
View article: Metasurface-enhanced spatial mode decomposition
Metasurface-enhanced spatial mode decomposition Open
Acquiring precise information about the mode content of a laser is critical for multiplexed optical communications, optical imaging with active wave-front control, and quantum-limited interferometric measurements. Hologram-based mode decom…
View article: Metasurface Enhanced Spatial Mode Decomposition
Metasurface Enhanced Spatial Mode Decomposition Open
Acquiring precise information about the mode content of a laser is critical for multiplexed optical communications, optical imaging with active wave-front control, and quantum-limited interferometric measurements. Hologram-based mode decom…
View article: A Continuum of Physics-Based Lithium-Ion Battery Models Reviewed
A Continuum of Physics-Based Lithium-Ion Battery Models Reviewed Open
Physics-based electrochemical battery models derived from porous electrode theory are a very powerful tool for understanding lithium-ion batteries, as well as for improving their design and management. Different model fidelity, and thus mo…
View article: Interferometric sensing of a commercial geophone
Interferometric sensing of a commercial geophone Open
We present a modified commercial L-4C geophone with interferometric readout that demonstrates a resolution 60 times lower than the included coil-magnet readout at low frequencies. The intended application for the modified sensor is in vibr…
View article: Compact Michelson interferometers with subpicometer sensitivity
Compact Michelson interferometers with subpicometer sensitivity Open
The network of interferometric gravitational-wave observatories has successfully detected tens of astrophysical signals since 2015. In this paper, we experimentally investigate compact sensors that have the potential to improve the sensiti…
View article: A six degree-of-freedom fused silica seismometer: design and tests of a metal prototype
A six degree-of-freedom fused silica seismometer: design and tests of a metal prototype Open
Ground vibrations couple to the longitudinal and angular motion of the aLIGO test masses and limit the observatory sensitivity below 30 Hz. Novel inertial sensors have the potential to improve the aLIGO sensitivity in this band and simplif…
View article: A compact six degree of freedom seismometer with interferometric readout
A compact six degree of freedom seismometer with interferometric readout Open
Ground vibrations couple to the longitudinal and angular motion of the aLIGO test masses and limit the observatory sensitivity below 30 Hz. Novel inertial sensors have the potential to improve the aLIGO sensitivity in this band and simplif…
View article: LIGO’s quantum response to squeezed states
LIGO’s quantum response to squeezed states Open
Gravitational wave interferometers achieve their profound sensitivity by combining a Michelson interferometer with optical cavities, suspended masses, and now, squeezed quantum states of light. These states modify the measurement process o…
View article: Meta-Material Enhanced Spatial Mode Decomposition
Meta-Material Enhanced Spatial Mode Decomposition Open
Acquiring precise information about the mode content of a laser is critical for multiplexed optical communications, optical imaging with active wave-front control, and quantum-limited interferometric measurements. Hologram-based mode decom…
View article: An interactive gravitational-wave detector model for museums and fairs
An interactive gravitational-wave detector model for museums and fairs Open
In 2015, the first observation of gravitational waves marked a breakthrough in astrophysics and in technological research and development. The discovery of a gravitational-wave signal from the collision of two black holes, a billion light-…
View article: Point absorbers in Advanced LIGO
Point absorbers in Advanced LIGO Open
Small, highly absorbing points are randomly present on the surfaces of the main interferometer optics in Advanced LIGO. The resulting nanometer scale thermo-elastic deformations and substrate lenses from these micron-scale absorbers signif…
View article: Reducing scattered light in LIGO’s third observing run
Reducing scattered light in LIGO’s third observing run Open
Noise due to scattered light has been a frequent disturbance in the advanced LIGO gravitational wave detectors, hindering the detection of gravitational waves. The non stationary scatter noise caused by low frequency motion can be recogniz…
View article: scooper93/gwexhibit: Initial release of Gravitational Wave Exhibit
scooper93/gwexhibit: Initial release of Gravitational Wave Exhibit Open
This version of the gravitational wave exhibition is currently in use at the Birmingham Thinktank science museum. The release is made available without images/ media and are available on request.
View article: Sensitivity and performance of the Advanced LIGO detectors in the third observing run
Sensitivity and performance of the Advanced LIGO detectors in the third observing run Open
© 2020 authors. Published by the American Physical Society. On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by the Advanced Virgo detector, began the third observing run, a year-long ded…