A5034169456- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Geophysics and Sensor Technology
- 3D Modeling in Geospatial Applications
- Astrophysics and Cosmic Phenomena
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Radio Astronomy Observations and Technology
- Atomic and Subatomic Physics Research
- Geological Modeling and Analysis
- Statistical and numerical algorithms
- Boron and Carbon Nanomaterials Research
- Advanced Frequency and Time Standards
- 3D Surveying and Cultural Heritage
- Astronomical Observations and Instrumentation
- Magnetic confinement fusion research
- Semiconductor materials and devices
- Superconducting Materials and Applications
- Remote Sensing and LiDAR Applications
- Mechanical and Optical Resonators
- Computational Geometry and Mesh Generation
- Geographic Information Systems Studies
Missouri University of Science and Technology
2020-2025
Asian Institute of Technology
2024
University of Oregon
2016-2021
Drexel University
2021
University of Missouri–Kansas City
2011-2019
Queensland Government
2013-2018
Japan External Trade Organization
2015
University of Southern Queensland
2013
South Dakota State University
2011
Toowoomba Hospital
2009
The Laser Interferometer Gravitational Wave Observatory (LIGO) has been directly detecting gravitational waves from compact binary mergers since 2015. We report on the first use of squeezed vacuum states in direct measurement with Advanced LIGO H1 and L1 detectors. This achievement is culmination decades research to implement gravitational-wave During ongoing O3 observation run, are improving sensitivity interferometers signals above 50 Hz by up 3 dB, thereby increasing expected detection...
On April 1st, 2019, the Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO), joined by Virgo detector, began third observing run, a year-long dedicated search for gravitational radiation. The LIGO detectors have achieved higher duty cycle and greater sensitivity to waves than ever before, with Hanford achieving angle-averaged binary neutron star coalescences distance of 111 Mpc, Livingston 134 Mpc factors 74.6% 77.0% respectively. improvement in stability is result several...
Quantum noise imposes a fundamental limitation on the sensitivity of interferometric gravitational-wave detectors like LIGO, manifesting as shot and quantum radiation pressure noise. Here, we present first realization frequency-dependent squeezing in full-scale detectors, resulting reduction both noise, with broadband detector enhancement from tens hertz to several kilohertz. In LIGO Hanford detector, reduced amplitude by factor 1.6 (4.0 dB) near 1 kHz; Livingston was 1.9 (5.8 dB). These...
The raw outputs of the detectors within Advanced Laser Interferometer Gravitational-Wave Observatory need to be calibrated in order produce estimate dimensionless strain used for astrophysical analyses. two have been upgraded since second observing run and finished year-long third run. Understanding, accounting, and/or compensating complex-valued response each part improves overall accuracy estimated detector gravitational waves. We describe improved understanding methods quantify detector,...
Calibration of the Advanced LIGO detectors is quantification detectors' response to gravitational waves. Gravitational waves incident on cause phase shifts in interferometer laser light which are read out as intensity fluctuations at detector output. Understanding this crucial producing accurate and precise wave strain data. Estimates binary black hole neutron star parameters tests general relativity require well-calibrated data, miscalibrations will lead biased results. We describe method...
The Advanced LIGO detectors have recently completed their second observation run successfully. lasted for approximately 10 months and lead to multiple new discoveries. sensitivity gravitational waves was partially limited by correlated noise. Here, we utilize auxiliary sensors that witness these noise sources, use them subtraction in the time domain data. This line removal is particularly significant Hanford Observatory, where improvement greater than 20%. Consequently, were also able...
The motion of a mechanical object, even human-sized should be governed by the rules quantum mechanics. Coaxing them into state is, however, difficult because thermal environment masks any signature object's motion. also effects proposed modifications mechanics at large mass scales. We prepared center-of-mass 10-kilogram oscillator in with an average phonon occupation 10.8. reduction temperature, from room temperature to 77 nanokelvin, is commensurate 11 orders-of-magnitude suppression...
The two interferometers of the Laser Interferometry Gravitational-wave Observatory (LIGO) recently detected gravitational waves from mergers binary black hole systems. Accurate calibration output these detectors was crucial for observation events and extraction parameters sources. principal tools used to calibrate responses second-generation (Advanced) LIGO are systems based on radiation pressure referred as photon calibrators. These systems, which were completely redesigned Advanced LIGO,...
Advanced LIGO's raw detector output needs to be calibrated compute dimensionless strain h(t). Calibrated data is produced in the time domain using both a low-latency, online procedure and high-latency, offline procedure. The low-latency h(t) stream two stages, first of which performed on same computers that operate detector's feedback control system. This stage, referred as front-end calibration, uses infinite impulse response (IIR) filtering performs all operations at 16384 Hz digital...
Hardware injections are simulated gravitational-wave signals added to the Laser Interferometer Gravitational-wave Observatory (LIGO). The detectors' test masses physically displaced by an actuator in order simulate effects of a gravitational wave. signal initiates control-system response which mimics that true This provides end-to-end LIGO's ability observe waves. analyses used detect and characterize exercised with hardware injections. By looking for discrepancies between injected recovered...
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 modify the measurement process LIGO, VIRGO GEO600 to reduce noise that masks astrophysical signals; thus, improvements squeezing are essential further expand our gravitational view universe. Further reducing will require both lowering decoherence from losses as well more sophisticated...
Multispectral remote sensing of the Earth using Landsat sensors was ushered on July 23, 1972, with launch Landsat-1. Following that success, four more satellites were launched, and each these carried Scanner System (MSS). These five provided only consistent multispectral space-based imagery Earth's surface from 1972 to 1982. This work focuses developing both a absolute radiometric calibration this sensor system. Cross-calibration MSS performed through use pseudoinvariant sites (PICSs). Since...
Because of its high electrical resistivity, low dielectric constant (κ), thermal neutron capture cross section, and robust chemical, thermal, mechanical properties, amorphous hydrogenated boron carbide (a-BxC:Hy) has garnered interest as a material for low-κ solid-state detection applications. Herein, we investigate the relationships between chemical structure (atomic concentration B, C, H, O), physical/mechanical properties (density, porosity, hardness, Young's modulus), electronic [band...
Calibration of the second-generation LIGO interferometric gravitational-wave detectors employs a method that uses injected periodic modulations to track and compensate for slow temporal variations in differential length response instruments. These utilize feedback control loops maintain resonance conditions by suppressing arm variations. We describe how sensing actuation functions these servo are parameterized parameters quantified using modulations. report results applying this show it...
As sensitivities improve and more detectors are added to the global network of gravitational wave observatories, calibration accuracy precision becoming increasingly important. Photon calibrators, relying on power-modulated auxiliary laser beams reflecting from suspended interferometer optics, enable continuous by generating displacement fiducials proportional modulated power. Developments in propagation power via transfer standards on-line sensors monitoring have enabled generation length...
Interferometric gravitational wave detectors operate with high optical power in their arms order to achieve shot-noise limited strain sensitivity. A significant limitation increasing the is phenomenon of three-mode parametric instabilities, which laser field arm cavities scattered into higher-order modes by acoustic cavity mirrors. The can further drive via radiation pressure, potentially producing an exponential buildup. One proposed technique stabilize instability active damping modes. We...
Noise due to scattered light has been a frequent disturbance in the Advanced LIGO gravitational wave detectors, hindering detection of waves. The non stationary scatter noise caused by low frequency motion can be recognized as arches time-frequency plane channel. In this paper, we characterize scattering for LIGO's third observing run O3 from April, 2019 March, 2020. We find at least two different populations and investigate multiple origins one them well its mitigation. that relative...
We present the probability distribution of systematic errors in most accurate, high-latency version reconstructed dimensionless strain $h$, at Hanford and Livingston LIGO detectors, used for gravitational-wave astrophysical analysis, including parameter estimation, last five months third observing run (O3B). This work extends results presented Sun et. al (2020) [1] first six (O3A). The complex-valued, frequency-dependent, slowly time-varying error (excursion from unity magnitude zero phase)...
A detailed experimental investigation of classical and quantum noises in the LIGO gravitational-wave detector is performed. As a result, an estimate radiation pressure noise given sensitivity for next run astrophysical experiments established.
Magic angle spinning solid-state nuclear magnetic resonance spectroscopy techniques are applied to the elucidation of local physical structure an intermediate product in plasma-enhanced chemical vapour deposition thin-film amorphous hydrogenated boron carbide (BxC:Hy) from orthocarborane precursor. Experimental shifts compared with theoretical shift predictions ab initio calculations model molecular compounds assign atomic environments, while Lee–Goldburg cross-polarization and heteronuclear...