D. A. Constable
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View article: Magnetic Field Aligned Potentials as an Acceleration Mechanism at Jupiter
Magnetic Field Aligned Potentials as an Acceleration Mechanism at Jupiter Open
Since arriving at Jupiter, Juno has observed instances of field-aligned proton and electron beams, in both the upward and downward current regions. These field-aligned beams are identified by inverted-V structures in plasma data, which ind…
View article: The Statistical Morphology of Saturn’s Equatorial Energetic Neutral Atom Emission
The Statistical Morphology of Saturn’s Equatorial Energetic Neutral Atom Emission Open
Saturn’s magnetosphere is an efficient emitter of energetic neutral atoms (ENAs), created through charge exchange of energetic ions with the extended neutral cloud originating from the icy moon Enceladus. We present an analysis using the c…
View article: A Complete Data Set of Equatorial Projections of Saturn's Energetic Neutral Atom Emissions Observed by Cassini‐INCA
A Complete Data Set of Equatorial Projections of Saturn's Energetic Neutral Atom Emissions Observed by Cassini‐INCA Open
Observations of energetic neutral atoms (ENAs) are a useful tool for analyzing ion and neutral abundances in planetary magnetospheres. They are created when hot plasma, originating for example from magnetic reconnection sites, charge‐excha…
View article: Modelling 1-D quasi-static potential structures at Jupiter
Modelling 1-D quasi-static potential structures at Jupiter Open
<p>Quasi-static potentials have long thought to be one of the significant drivers of the main ultraviolet emission associated with Jupiter&#8217;s auroral oval. The magnetic field lines connecting to the auroral zone extend into …
View article: Ionospheric Outflow at Jupiter and Saturn
Ionospheric Outflow at Jupiter and Saturn Open
Ionospheric outflow is the outward flow of atmospheric plasma, initiated by a loss of equilibrium along the magnetic field. Terrestrial ionospheric outflow presents as a polar wind triggered by the Dungey cycle, which drives much of Earth&…
View article: Towards a complete dataset of equatorial projections of Saturn's ENA emissions observed by Cassini/INCA
Towards a complete dataset of equatorial projections of Saturn's ENA emissions observed by Cassini/INCA Open
Observations of energetic neutral atoms (ENAs) are a useful tool for analyzing ion and neutral abundances in planetary magnetospheres. Saturn's magnetosphere is dominated by high densities of water group neutrals which originate from the i…
View article: Evaluating the Ionospheric Mass Source for Jupiter's Magnetosphere: An Ionospheric Outflow Model for the Auroral Regions
Evaluating the Ionospheric Mass Source for Jupiter's Magnetosphere: An Ionospheric Outflow Model for the Auroral Regions Open
Ionospheric outflow is the flow of plasma initiated by a loss of equilibrium along a magnetic field line, which induces an ambipolar electric field due to the separation of electrons and ions in a gravitational field and other mass‐depende…
View article: The Effect of Field‐Aligned Currents and Centrifugal Forces on Ionospheric Outflow at Saturn
The Effect of Field‐Aligned Currents and Centrifugal Forces on Ionospheric Outflow at Saturn Open
Ionospheric outflow is driven by an ambipolar electric field induced due to the separation of electrons and ions in a gravitational field when equilibrium along a magnetic field line is lost. A model of ionospheric outflow at Saturn was de…
View article: Energetic Particle Signatures Above Saturn's Aurorae
Energetic Particle Signatures Above Saturn's Aurorae Open
Near the end of its mission, NASA's Cassini spacecraft performed several low‐altitude passes across Saturn's auroral region. We present ultraviolet auroral imagery and various coincident particle and field measurements of two such passes, …
View article: National Astronomy Meeting 2019 Abstract Book
National Astronomy Meeting 2019 Abstract Book Open
The National Astronomy Meeting 2019 Abstract Book. Abstracts accepted and presented, including both oral and poster presentations, at the Royal Astronomical Society's NAM2019 conference, held at Lancaster University between 30 June and 4 J…
View article: National Astronomy Meeting 2019 Abstract Book
National Astronomy Meeting 2019 Abstract Book Open
The National Astronomy Meeting 2019 Abstract Book. Abstracts accepted and presented, including both oral and poster presentations, at the Royal Astronomical Society's NAM2019 conference, held at Lancaster University between 30 June and 4 J…
View article: 1-D Hybrid Kinetic/Fluid Modelling of the Jovian Magnetosphere
1-D Hybrid Kinetic/Fluid Modelling of the Jovian Magnetosphere Open
Based on early measurements from the Juno spacecraft, magnetosphere-ionosphere-thermosphere (MIT) coupling studies of the Jovian system are thought to have under-estimated the densities of plasma species in the high-latitude regions of the…
View article: Modelling of Magnetosphere-Ionosphere Coupling in the Jovian System
Modelling of Magnetosphere-Ionosphere Coupling in the Jovian System Open
Auroral emissions are generated through the acceleration of current carriers along magnetic field lines, with particles precipitating into the atmosphere of a planet. The distribution of plasma within the planetary magnetosphere determines…
View article: A Millimeter-Wave Klystron Upconverter With a Higher Order Mode Output Cavity
A Millimeter-Wave Klystron Upconverter With a Higher Order Mode Output Cavity Open
Manufacturing of klystrons in the millimeter-wave frequency range is challenging due to the small size of the cavities and the ratio of the maximum gap voltage to the beam energy. The small dimensions also make difficult to produce devices…
View article: High Efficiency Klystrons Using the COM Bunching Technique
High Efficiency Klystrons Using the COM Bunching Technique Open
Future large-scale particle accelerators, for example, the Future Circular Collider (FCC), the Compact Linear Collider (CLIC) and the International Linear Collider (ILC), will require significant RF drive power on the order of 100 MW. Thus…
View article: High Efficiency Klystron Development for Particle Accelerators
High Efficiency Klystron Development for Particle Accelerators Open
Upcoming large scale particle accelerators, such as the Future Circular Collider (FCC), the Compact Linear Collider (CLIC) and the International Linear Collider (ILC) are expected to require RF drive on the order of 100 MW. Therefore, effo…
View article: MAGIC-2D simulations of high efficiency hollow beam klystrons
MAGIC-2D simulations of high efficiency hollow beam klystrons Open
Results from MAGIC-2D simulations of hollow beam, 800 MHz klystrons, with efficiencies on the order of 85% are presented. Such tubes employ the core oscillation method of electron bunching, which allows for most electrons in the beam to be…
View article: Numerical design of high efficiency klystrons using core oscillation bunching
Numerical design of high efficiency klystrons using core oscillation bunching Open
1-D and 2-D numerical simulations of 800 MHz klystrons with efficiencies approaching 90% are presented. While traditional klystrons employ monotonic electron bunching along their lengths, the core oscillation method allows for an improved …