Andrew D. Holland
A5066342006- CCD and CMOS Imaging Sensors
- Particle Detector Development and Performance
- Infrared Target Detection Methodologies
- Calibration and Measurement Techniques
- Astrophysical Phenomena and Observations
- Stellar, planetary, and galactic studies
- Advanced X-ray and CT Imaging
- Advanced X-ray Imaging Techniques
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Photocathodes and Microchannel Plates
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Semiconductor Detectors and Materials
- Astro and Planetary Science
- Advanced Optical Sensing Technologies
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Silicon and Solar Cell Technologies
- Radiation Effects in Electronics
- Gamma-ray bursts and supernovae
- Integrated Circuits and Semiconductor Failure Analysis
- Thin-Film Transistor Technologies
- Solar and Space Plasma Dynamics
University of Leeds
2022-2025
The Open University
2015-2024
Abcam (United Kingdom)
2009-2024
Bridge University
2023
The University of Queensland
2023
The University of Western Australia
2023
Central Queensland University
2023
Murdoch Children's Research Institute
2023
Jet Propulsion Laboratory
2023
University of Bradford
2006-2022
The European Photon Imaging Camera (EPIC) consortium has provided the focal plane instruments for three X-ray mirror systems on XMM-Newton. Two cameras with a reflecting grating spectrometer in optical path are equipped MOS type CCDs as detectors (Turner [CITE]), telescope full photon flux operates novel pn-CCD an imaging spectrometer. camera system was developed under leadership of Max-Planck-Institut für extraterrestrische Physik (MPE), Garching. concept is described well different...
At about 1000 days after the launch of Gaia we present first data release, DR1, consisting astrometry and photometry for over 1 billion sources brighter than magnitude 20.7. We summarize DR1 provide illustrations scientific quality data, followed by a discussion limitations due to preliminary nature this release. consists of: primary astrometric set which contains positions, parallaxes, mean proper motions 2 million brightest stars in common with Hipparcos Tycho-2 catalogues secondary...
This paper presents development of an X-ray pixel detector with a multi-port charge-coupled device (MPCCD) for Free-Electron laser experiments. The fabrication process the CCD was selected based on radiation hardness against estimated annual dose 1.6 × 10(14) photon/mm(2). sensor optimized by maximizing full well capacity as high 5 Me- within 50 μm square pixels while keeping single photon detection capability photons higher than 6 keV and readout speed 60 frames/s. system also included...
This study introduces an adaptive three-dimensional (3D) image synthesis technique for creating variational realizations of fibrous meniscal tissue microstructures. The method allows controlled deviation from original geometries by modifying parameters such as porosity, pore size and specific surface area patches. unbiased reconstructed samples matched the morphological hydraulic properties tissues, with relative errors generally below 10%. Additional were generated predefined deviations to...
Parallaxes for 331 classical Cepheids, 31 Type II Cepheids and 364 RR Lyrae stars in common between Gaia the Hipparcos Tycho-2 catalogues are published Data Release 1 (DR1) as part of Tycho-Gaia Astrometric Solution (TGAS). In order to test these first parallax measurements primary standard candles cosmological distance ladder, that involve astrometry collected by during initial 14 months science operation, we compared them with literature estimates derived new period-luminosity ($PL$),...
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides position and photometry, proper motion parallax are calculated using Hipparcos Tycho-2 positions in 1991.25 as prior information. Aims. We investigate scientific potential limitations TGAS component by means astrometric data open clusters. Methods. Mean cluster values derived taking into account error correlations within solutions individual...
This paper presents the specification, design, and development of Visible Camera (VIS) on European Space Agency's mission. VIS is a large optical-band imager with field view 0.54 deg$^2$ sampled at an array 609 Megapixels spatial resolution . It will be used to survey approximately 14 000 extragalactic sky measure distortion galaxies in redshift range $z=0.1$--1.5 resulting from weak gravitational lensing, one two principal cosmology probes leveraged by With photometric redshifts,...
Shamanic belief systems represent the first form of religious practice visible within global archaeological record. Here we report on earliest known evidence shamanic costume: modified red deer crania headdresses from Early Holocene site Star Carr (c. 11 kya). More than 90% examples prehistoric Europe come this one site, establishing it as a place outstanding shamanistic/cosmological significance. Our work, involving programme experimental replication, analysis macroscopic traces, organic...
The Wide Field InfraRed Survey Telescope-Astrophysics Focused Telescope Asset (WFIRST-AFTA) mission is a 2.4-m class space telescope that will be used across swath of astrophysical research domains. JPL provide high-contrast imaging coronagraph instrument—one two major astronomical instruments. In order to achieve the low noise performance required detect planets under extremely flux conditions, electron multiplying charge-coupled device (EMCCD) has been baselined for both coronagraph's...
The Soft X-ray Imager (SXI) is part of the scientific payload Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) mission. SMILE a joint science mission between European Space Agency (ESA) and Chinese Academy Sciences (CAS) due for launch in 2025. SXI compact telescope with wide field-of-view (FOV) capable encompassing large portions Earth's magnetosphere from vantage point orbit. sensitive to soft X-rays produced by Wind Charge eXchange (SWCX) process when heavy ions solar origin...
<i>Euclid</i>-VIS is the large format visible imager for ESA <i>Euclid</i> space mission in their Cosmic Vision program, scheduled launch 2020. Together with near infrared imaging within NISP instrument, it forms basis of weak lensing measurements <i>Euclid</i>. VIS will image a single <i>r+i+z</i> band from 550-900 nm over field view ~0.5 deg<sup>2</sup>. By combining 4 exposures total 2260 sec, reach to deeper than mAB=24.5 (10σ) sources extent ~0.3 arcsec. The sampling 0.1 provide...
Context. This paper presents an overview of the photometric data that are part first Gaia release. Aims. The principles processing and main characteristics presented. Methods. calibration strategy is outlined briefly properties resulting photometry Results. Relations with other broadband systems provided. overall precision for shown to be at milli-magnitude level has a clear potential improve further in future releases.
In the context of ESA M5 (medium mission) call we proposed a new satellite mission, Theia, based on relative astrometry and extreme precision to study motion very faint objects in Universe. Theia is primarily designed local dark matter properties, existence Earth-like exoplanets our nearest star systems physics compact objects. Furthermore, about 15 $\%$ mission time was dedicated an open observatory for wider community propose complementary science cases. With its unique metrology system...
The science goals of space missions from the Hubble Space Telescope through to Gaia and Euclid require ultraprecise positional, photometric, shape measurement information. However, in radiation environment telescopes, damage focal plane detectors high-energy protons leads creation traps, a loss charge transfer efficiency, consequent deterioration accuracy. An understanding traps produced their properties CCD during operation is essential allow optimization devices suitable modeling correct...
<i>Euclid</i>-VIS is the large format visible imager for ESA Euclid space mission in their Cosmic Vision program, scheduled launch 2020. Together with near infrared imaging within NISP instrument, it forms basis of weak lensing measurements <i>Euclid</i>. VIS will image a single <i>r+i+z</i> band from 550-900 nm over field view ~0.5 deg<sup>2</sup>. By combining 4 exposures total 2260 sec, reach to V=24.5 (10σ) sources extent ~0.3 arcsec. The sampling 0.1 provide deep tightly controlled and...
We describe the development of flight electron multiplying charge coupled devices (EMCCDs) for photon-counting camera system a coronagraph instrument (CGI) to be flown on 2.4-m Nancy Grace Roman Space Telescope. is NASA flagship mission that will study dark energy and matter, search exoplanets with planned launch in mid-2020s. The CGI intended demonstrate technologies required high-contrast imaging spectroscopy exoplanets, such as high-speed wavefront sensing pointing control, adaptive...
The definition and optimisation studies for the Gaia satellite spectrograph, Radial Velocity Spectrometer (RVS), converged in late 2002 with adoption of instrument baseline. This paper reviews characteristics selected configuration presents its expected performance. RVS is a 2.0 by 1.6 degree integral field dispersing light all sources entering view resolving power R=11 500 over wavelength range [848, 874] nm. will continuously repeatedly scan sky during 5 years mission. On average, each...