James Dedrick
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View article: Boron and phosphorus doped diamond: change in the electronic structure post exposure to low pressure deuterium plasma and its effect on the production of negative ions
Boron and phosphorus doped diamond: change in the electronic structure post exposure to low pressure deuterium plasma and its effect on the production of negative ions Open
Negative ion production is of significant interest for materials processing and neutral beam injection systems for magnetic confinement fusion reactors. The surface production mechanism can be required for high current applications. Dielec…
View article: Ozone production by an He+O<sub>2</sub> radio-frequency atmospheric pressure plasma jet driven by tailored voltage waveforms
Ozone production by an He+O<sub>2</sub> radio-frequency atmospheric pressure plasma jet driven by tailored voltage waveforms Open
Atmospheric pressure plasma jets are efficient sources of reactive oxygen and nitrogen species with potential applications in medicine, materials processing, green industry and agriculture. However, selective control over the production of…
View article: Measuring negative ion yield and work function from phosphorus doped diamond, boron doped diamond, and graphite in deuterium plasmas
Measuring negative ion yield and work function from phosphorus doped diamond, boron doped diamond, and graphite in deuterium plasmas Open
International audience
View article: Magnetic enhancement of the electrical asymmetry effect in capacitively coupled plasmas
Magnetic enhancement of the electrical asymmetry effect in capacitively coupled plasmas Open
The development of real-time control strategies for key discharge parameters, such as densities, fluxes, and energy distributions, is of fundamental interest to many plasma sources. Over the last decade, multi-harmonic ‘tailored’ voltage w…
View article: Ionization and neutral gas heating efficiency in radio frequency electrothermal microthrusters: The role of driving frequency
Ionization and neutral gas heating efficiency in radio frequency electrothermal microthrusters: The role of driving frequency Open
The development of compact, low power, charge–neutral propulsion sources is of significant recent interest due to the rising application of micro-scale satellite platforms. Among such sources, radio frequency (rf) electrothermal microthrus…
View article: Low-pressure inductively coupled plasmas in hydrogen: impact of gas heating on the spatial distribution of atomic hydrogen and vibrationally excited states
Low-pressure inductively coupled plasmas in hydrogen: impact of gas heating on the spatial distribution of atomic hydrogen and vibrationally excited states Open
Non-equilibrium inductively coupled plasmas (ICPs) operating in hydrogen are of significant interest for applications including large-area materials processing. Increasing control of spatial gas heating, which drives the formation of neutr…
View article: Particle-in-cell simulations of high frequency capacitively coupled plasmas including spatially localised inductive-like heating
Particle-in-cell simulations of high frequency capacitively coupled plasmas including spatially localised inductive-like heating Open
High frequency (HF) capacitively coupled plasmas (CCPs) are ubiquitous, having several industrial applications, especially in the semiconductor industry. Inductive heating effects within these plasmas play an important role and therefore u…
View article: Surface production of negative deuterium ions from plasma-exposed boron doped diamond and graphite: work function measurements using photoemission yield spectroscopy
Surface production of negative deuterium ions from plasma-exposed boron doped diamond and graphite: work function measurements using photoemission yield spectroscopy Open
Negative-ion sources are of considerable interest for applications such as materials processing and neutral beam injection for magnetic confinement fusion. The efficient production of negative ions in these sources often relies on surface …
View article: Surface production of negative ions from pulse-biased nitrogen doped diamond within a low-pressure deuterium plasma
Surface production of negative ions from pulse-biased nitrogen doped diamond within a low-pressure deuterium plasma Open
The production of negative ions is of significant interest for applications including mass spectrometry, materials surface processing, and neutral beam injection for magnetic confined fusion. Neutral beam injection sources maximise negativ…
View article: Enhancing surface production of negative ions using nitrogen doped diamond in a deuterium plasma
Enhancing surface production of negative ions using nitrogen doped diamond in a deuterium plasma Open
The production of negative ions is of significant interest for applications including mass spectrometry, particle acceleration, material surface processing, and neutral beam injection for magnetic confinement fusion. Methods to improve the…
View article: Characterization and Control of an Ion-Acoustic Plasma Instability Downstream of a Diverging Magnetic Nozzle
Characterization and Control of an Ion-Acoustic Plasma Instability Downstream of a Diverging Magnetic Nozzle Open
The study and control of resonant instabilities in magnetized plasmas is of fundamental interest over a wide range of applications from industrially relevant plasmas to plasma sources for spacecraft propulsion. In this work electrostatic p…
View article: Inducing locally structured ion energy distributions in intermediate-pressure plasmas
Inducing locally structured ion energy distributions in intermediate-pressure plasmas Open
Ion energy distribution functions (IEDFs) incident upon material surfaces in radio frequency (rf) capacitively coupled plasmas are coupled to spatial and temporal sheath dynamics. Tailoring the ion energy distribution function within inter…
View article: Disrupting the spatio-temporal symmetry of the electron dynamics in atmospheric pressure plasmas by voltage waveform tailoring
Disrupting the spatio-temporal symmetry of the electron dynamics in atmospheric pressure plasmas by voltage waveform tailoring Open
Single frequency, geometrically symmetric Radio-Frequency (rf) driven atmospheric pressure plasmas exhibit temporally and spatially symmetric patterns of electron heating, and consequently, charged particle densities and fluxes. Using a co…
View article: Chemical kinetics in an atmospheric pressure helium plasma containing humidity
Chemical kinetics in an atmospheric pressure helium plasma containing humidity Open
Investigating the formation and kinetics of O and OH in a He–H2O plasma jet using absorption spectroscopy and 0D modelling.
View article: Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma
Controlled production of atomic oxygen and nitrogen in a pulsed radio-frequency atmospheric-pressure plasma Open
International audience
View article: Phase-resolved optical emission spectroscopy of a neutralizer-free gridded ion thruster
Phase-resolved optical emission spectroscopy of a neutralizer-free gridded ion thruster Open
International audience
View article: Microplasma Array Patterning of Reactive Oxygen and Nitrogen Species onto Polystyrene
Microplasma Array Patterning of Reactive Oxygen and Nitrogen Species onto Polystyrene Open
We investigate an approach for the patterning of reactive oxygen and nitrogen species
\n(RONS) onto polystyrene using atmospheric-pressure microplasma arrays. The spectrally
\nintegrated and time-resolved optical emission from the array is…
View article: Enhanced control of the ionization rate in radio-frequency plasmas with structured electrodes via tailored voltage waveforms: supporting data
Enhanced control of the ionization rate in radio-frequency plasmas with structured electrodes via tailored voltage waveforms: supporting data Open
Data required to reproduce the results presented in the paper "Enhanced control of the ionization rate in radio-frequency plasmas with structured electrodes via tailored voltage waveforms" Funded by EPSRC Doctoral Training Partnership gran…