D. Hoyland
A5103260035- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Geophysics and Sensor Technology
- Radio Astronomy Observations and Technology
- Seismic Waves and Analysis
- Advanced Frequency and Time Standards
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Particle Accelerators and Free-Electron Lasers
- Experimental Learning in Engineering
- Gamma-ray bursts and supernovae
- Magnetic confinement fusion research
- Advanced Electrical Measurement Techniques
- Seismology and Earthquake Studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Particle physics theoretical and experimental studies
- Earthquake Detection and Analysis
- Inertial Sensor and Navigation
- Ionosphere and magnetosphere dynamics
- Particle accelerators and beam dynamics
- Astronomy and Astrophysical Research
- Photonic and Optical Devices
- Advanced Measurement and Metrology Techniques
University of Birmingham
2010-2024
LIGO Scientific Collaboration
2023
Science and Technology Facilities Council
2023
Rutherford Appleton Laboratory
2023
University of Glasgow
2022
Vrije Universiteit Amsterdam
2022
National Institute for Subatomic Physics
2022
We describe the design of suspension systems for major optics Advanced LIGO, upgrade to LIGO—the Laser Interferometric Gravitational-Wave Observatory. The is based on that used in GEO600—the German/UK interferometric gravitational wave detector, with further development meet more stringent noise requirements LIGO. test mass suspensions consist a four-stage or quadruple pendulum enhanced seismic isolation. To minimize thermal noise, final stage consists silica mirror, 40 kg mass, suspended...
The LISA Technology Package (LTP), to be launched by ESA in 2006/2007, is a technology demonstration mission preparation for the space-borne gravitational wave detector. A central part of LTP optical metrology package (heterodyne interferometer with phasemeter) which monitors distance between two test masses noise level 10 pm Hz−1/2 3 mHz and 30 mHz. It has dynamic range >100 µm without any actuators pathlength. In addition longitudinal measurements, it provides alignment measurements an...
This paper presents a quantitative assessment of the performance upcoming LISA Pathfinder geodesic explorer mission. The findings are based on results extensive ground testing and simulation campaigns using flight hardware, control operations algorithms. show that, for central experiment measuring stray differential acceleration between test masses, will be able to verify overall noise within factor 2 requirement at 1 mHz 6 0.1 mHz. We also discuss key elements physical model disturbances,...
Electrostatic force actuation is a key component of the system geodesic reference test masses (TM) for LISA orbiting gravitational wave observatory and in particular performance at low frequencies, below 1 mHz, where sensitivity limited by stray noise. The needs to apply forces order 10−9 N while limiting fluctuations measurement band levels approaching 10−15 N/Hz1/2. We present here design, based on audio-frequency voltage carrier signals, results its in-flight with Pathfinder mission. In...
We report on the development of LISA Technology Package (LTP) experiment that will fly onboard Pathfinder mission European Space Agency in 2008. first summarize science rationale aimed at showing operational feasibility so-called transverse–traceless coordinate frame within accuracy needed for LISA. then show briefly basic features instrument and we finally discuss its projected sensitivity extrapolation results to
The network of interferometric gravitational-wave observatories has successfully detected tens astrophysical signals since 2015. In this paper, we experimentally investigate compact sensors that have the potential to improve sensitivity detectors intermediate-mass black holes. We use only commercial components, such as sensing heads and lasers, assemble setup demonstrate its subpicometer precision. consists a pair Michelson interferferometers deep frequency modulation techniques obtain...
In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA's LISA Pathfinder mission, and shown residual sensor noise to be level ${32.0}_{\ensuremath{-}1.7}^{+2.4}\text{ }\text{ }\mathrm{fm}/\sqrt{\mathrm{Hz}}$. This review provides deeper more complete overview full system its interferometric mission performance under varying operational conditions, allowing much detailed view model. We also include optical measurements rotations...
The (LPF) mission successfully demonstrated the feasibility of technology needed for future space borne gravitational wave observatory LISA. A key subsystem under study was laser interferometer, which measured changes in relative distance between two test masses (TMs). It achieved a sensitivity <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
eLISA is a space mission designed to measure gravitational radiation over frequency range of 0.1–100 mHz (European Space Agency LISA Assessment Study Report 2011). It uses laser interferometry changes order in the separation inertial test masses housed spacecraft separated by 1 million km. Pathfinder (LPF) technology demonstrator that will key technologies monitored drag-free spacecraft. The optical bench provides for LPF must meet number stringent requirements: path be stable at few level;...
We have developed, produced and characterised integrated sensors, actuators the related read-out drive electronics that will be used for control of Advanced LIGO suspensions.The overall system consists BOSEMs (displacement sensor with electro-magnetic actuator), satellite boxes (BOSEM readout interface electronics) six different types coil-driver units.In this paper we present design system, discuss performance relevant suspensions, report on experimental activity finalised at production...
We present a compact, fibre-coupled interferometer with high sensitivity and large working range.We propose to use this as readout mechanism for future inertial sensors, removing major limiting noise source, in precision positioning systems.The interferometer's peak is 2 × 10 -14 m/ √ Hz at 70 7 -11 mHz.If deployed on GS-13 geophone, the resulting sensing output will be limited by suspension thermal of reference mass from mHz Hz.
We present an in depth analysis of the transient events, or glitches, detected at a rate about one per day differential acceleration data LISA Pathfinder. show that these glitches fall two rather distinct categories: fast transients interferometric motion readout on side, and true force events other. The former are rare ordinary conditions. second may last from seconds to hours constitute majority glitches. physical statistical properties both categories, including cross-analysis with other...
The LISA Technology Package (LTP) on board the Pathfinder mission aims to demonstrate some key concepts for which cannot be tested ground.The consists of a series preplanned experimental runs.The data analysis each experiment must designed in advance mission.
Abstract We present a modified commercial L-4C geophone with interferometric readout that demonstrates resolution 60 times lower than the included coil-magnet at low frequencies. The intended application for sensor is in vibration isolation platforms require improved performance frequencies 1 Hz. To illustrate it’s controls- and noise-model of an Advanced LIGO ‘HAM-ISI’ system was developed, shows our can reduce residual motion by factor 70 0.1
The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate long-term stability of coefficients noise. We show that they drifted slowly (by <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>μm</a:mi><a:mo>/</a:mo><a:mi>rad</a:mi></a:mrow></a:math> <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
The LISA test masses must be kept free of stray acceleration noise to within 3 × 10−15 m s−2 Hz−1/2 in order obtain the low-frequency gravitational wave sensitivity goal. technology package (LTP) is a dedicated ESA flight experiment for testing drag-free control that ensure purity fall mission. We present here brief description LTP experimental configuration, specific measurements performed and requirements met demonstrate upper limit goal 10−14 at 1 mHz.
Abstract Ground vibrations couple to the longitudinal and angular motion of aLIGO test masses limit observatory sensitivity below 30 Hz. Novel inertial sensors have potential improve in this band simplify lock acquisition detectors. In paper, we experimentally study a compact 6D seismometer that consists mass suspended by single wire. The position is interferometrically read out relative platform supports seismometer. We present experimental results, discuss limitations our metallic...
We demonstrate the control scheme of an active platform with a six degree freedom (6D) seismometer. The inertial sensor simultaneously measures translational and tilt degrees does not require any additional sensors for stabilization. show that feedforward cancelation can efficiently decouple tilt-to-horizontal coupling seismometer in digital scheme. stabilize frequency band from 250 mHz up to 10 Hz (X, Y) achieve suppression factor 100 around 1 Hz. Further ground vibrations was limited by...
Advanced Laser Interferometer Gravitational-wave Observatory (LIGO A+) is a major upgrade to LIGO-the Observatory. For the A+ project, we have developed, produced, and characterized sensors electronics interrogate new optical suspensions designed isolate optics from vibrations. The central element displacement sensor with an integrated electromagnetic actuator known as BOSEM (Birmingham Optical Sensor ElectroMagnetic actuator) its readout drive required integrate them into LIGO's control...
This paper gives an update on the status of LISA technology package (LTP) which is to be launched in 2009 by ESA as a demonstration mission for spaceborne gravitational wave observatory LISA. The dominant noise source interferometer prototype has been investigated and improved such that it now comfortably below its budget at all frequencies.
The data analysis of the LISA Technology Package (LTP) will comprise a series discrete experiments, each focusing on particular noise measurement or characterization instrument in various operating modes. Each these experiments must be analysed and planned advance mission because results given experiment have an impact those that follow. As such, mock challenges (MDCs) developed carried out with aim preparing tools optimizing analyses. first MDCs (MDC1) is simplified treatment dynamics along...
The LISA Technology Package (LTP) will verify the performance of inertial sensors that are being developed for mission. position test masses be read out by a heterodyning laser interferometer system with phase detected signals also providing measurements their angular alignment. electronics required to measure relative phases from photo-detectors has been as part an ESA contract and preliminary results bench testing unit presented.
Since the 2017 Nobel Prize in Physics was awarded for observation of gravitational waves, it is fair to say that epoch wave astronomy (GWs) has begun.However, a number interesting sources GWs can only be observed from space.To demonstrate feasibility Laser Interferometer Space Antenna (LISA), future observatory space, LISA Pathfinder satellite launched on December, 3rd 2015.Measurements spurious forces accelerating an otherwise free-falling test mass, and detailed investigations individual...
LISA Pathfinder is a mission planned by the European Space Agency to test key technologies that will allow detection of gravitational waves in space. The instrument on-board, Technology package, undergo an exhaustive campaign calibrations and noise characterisation campaigns order fully describe model. Data analysis plays important role for reason data team has been developing toolbox which contains all functionalities required during operations. In this contribution we give overview recent...