A5039027006- Magnetic confinement fusion research
- Crop Yield and Soil Fertility
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Agronomic Practices and Intercropping Systems
- Ionosphere and magnetosphere dynamics
- Soybean genetics and cultivation
- Gambling Behavior and Treatments
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Homelessness and Social Issues
- Animal Disease Management and Epidemiology
- Agricultural Science and Fertilization
- Gyrotron and Vacuum Electronics Research
- Agricultural Innovations and Practices
- Nematode management and characterization studies
- Sexuality, Behavior, and Technology
- Agricultural Economics and Policy
- Nitrogen and Sulfur Effects on Brassica
- Healthcare Decision-Making and Restraints
- Laser-induced spectroscopy and plasma
- Atomic and Subatomic Physics Research
- Complementary and Alternative Medicine Studies
- Healthcare innovation and challenges
- Dust and Plasma Wave Phenomena
University of Lincoln
2010-2024
Iowa State University
2015-2021
West Texas A&M University
2018
Armstrong Atlantic State University
2015
Wardell Armstrong (United Kingdom)
2015
Metrum Research Group (United States)
2014
University of Hull
2010
Wake Forest University
2010
Princeton Plasma Physics Laboratory
1992-2002
Princeton University
1992-2000
Shared symptoms between borderline personality disorder and depression have resulted in inherent difficulties evaluating the relationship these disorders. Some theorists argued that patients with is qualitatively distinct from nonborderline patients. The purpose of this study was to empirically identify aspects most associated disorder.Through interview self-report measures, authors studied 50 inpatients, 21 whom had disorder.The were self-condemnation, emptiness, abandonment fears,...
Shearing of the plasma poloidal rotation velocity was observed during application ion Bernstein wave power in Tokamak Fusion Test Reactor. The first evidence corroboration between measured shearing and actively induced Reynolds stress effects is presented. A model reproduces salient experimental features: sheared flow occurs near tritium fifth harmonic cyclotron resonance layer depends strongly on density agreement with model. Furthermore, insensitivity to region third deuterium layer.
New theoretical and experimental tools are applied to the analysis of ICRF antenna-edge plasma interactions in TFTR tokamak. A new numerical method for computing three dimensional (3-D) rf sheath voltage distribution is used, quantitative predictions theory compared with measurements edge density profile obtained by microwave reflectometry titanium impurity concentration data. It shown that local depletion at antenna consistent pump-out strong E × B convection into Faraday screen (FS)....
Experiments with plasmas having nearly equal concentrations of deuterium and tritium have been carried out on TFTR. To date (September 1995), the maximum fusion power has 10.7 MW, using 39.5 MW neutral beam heating, in a supershot discharge 6.7 high beta P following current ramp-down. The density core plasma reached 2.8 MW/m3, exceeding that expected International Thermonuclear Experimental Reactor (ITER). energy confinement time tau E is observed to increase DT, relative D plasmas, by 20%...
The first experimental demonstration that mode conversion from the fast magnetosonic wave to an ion Bernstein can efficiently heat electrons and drive current with low field side antennas in a tokamak plasma is reported. Up 130 kA of was noninductively driven, on off axis, resultant profiles were measured Tokamak Fusion Test Reactor. In heating experiments, 10 keV peak electron temperatures produced 3.3 MW radio-frequency power.
The three dimensional (3-D) nature of antennas for fusion applications in the ion cyclotron range frequencies (ICRF) requires accurate modelling to design and analyse new antennas. In this article, analysis tools radiofrequency (RF) are successfully benchmarked with experiment, 3-D physics launched waves is explored. systematic combines measured density profiles from a reflectometer system, transmission line circuit modelling, detailed magnetostatics electromagnetic antenna model including...
Experiments have been performed on the TFTR to study rf wave heating of a D-T plasma by way second-harmonic tritium cyclotron resonance. The addition ions deuterium allows for absorption waves at harmonics and electron damping mode converted ion Bernstein wave. Competing mechanisms include direct fundamental resonance deuterium, $\ensuremath{\alpha}$ particles, ${}^{3}$He ions. contribution each is estimated from series discharges where various parameters are varied. majority power found damp
The first experiments utilizing high-power radio waves in the ion cyclotron range of frequencies to heat deuterium–tritium (D–T) plasmas have been completed on Tokamak Fusion Test Reactor [Fusion Technol. 21, 13 (1992)]. Results from initial series demonstrated efficient core second harmonic tritium (2ΩT) heating parameter regimes approaching those anticipated for International Thermonuclear Experimental [D. E. Post, Plasma Physics and Controlled Nuclear Research, Proceedings 13th...
The alpha particle effect on the excitation of toroidal Alfv\'en eigenmodes (TAE) was investigated in deuterium-titrium (D-T) plasmas Tokamak Fusion Test Reactor. rf power used to position plasma near instability threshold, and inferred from reduction threshold for TAE D-T plasmas. Initial calculations indicate that particles contribute 10%--30% total drive a with 3 MW peak fusion power.
Temporal and spatial measurements of electron heat transport are made in the University California Davis AURORA device (J. H. Rogers, Ph.D. dissertation, California, Davis, 1987). In AURORA, a microwave pulse heats region underdense, collisional, plasma (n/ncr ≲1, where ncr =1.8×1010 cm−3 is critical density, Te0 ≊0.15 eV, scattering mean free path λ⊥≳2 cm). this region, strong thermal heating (Tc ≲0.7 eV) as well suprathermal (Th≊3 observed. The results steep temperature gradient that...
Experiments with plasma heating by waves at the ion cyclotron resonance of a minority species have shown that efficiency degrades above certain power threshold. It is found this threshold due to destabilization branch shear Alfvén waves, Energetic Particle Modes, which causes diffusive loss fast ions. These modes not only play fundamental role in transport ions, but appear closely related formation giant sawteeth.
A discrete area of defective enamel formation that appears on the labial surface crowns deciduous canine teeth has been described in both recent and prehistoric human populations, with reported frequencies varying from 1 to 45 per cent. Suggestions about aetiology this localized hypoplasia range genotypic factors environmental conditions systemic effects. The major aims study were describe frequency occurrence pattern expression lesion Australian Aboriginal Caucasian ethnic groups, clarify...
The nonlinear behavior of the toroidal Alfvén eigenmode (TAE) driven unstable by energetic ions in Tokamak Fusion Test Reactor (TFTR) [Phys. Plasmas 1, 1560 (1994)] is studied. evolution instabilities can take on several scenarios: a single mode or modes be at same time, spectrum steady pulsating, and there negligible anomalous loss associated with instability. This paper presents comparison between experimental results recently developed theory. Many features observed experiment are...
Recent experiments in the ion cyclotron range of frequencies (ICRF) Tokamak Fusion Test Reactor [Fusion Technol. 21, 13 (1992)] are discussed. These include mode conversion heating and current drive, fast wave low (L)- deuterium–tritium (D–T) plasmas both hydrogen minority second harmonic tritium regimes. In heating, a central electron temperature 10 keV was attained with 3.3 MW radio-frequency power. drive experiments, up to 130 kA noninductively driven, on off axis, profiles were modified....
Problem gambling attracts little attention from health and social care agencies in the UK. Prevalence surveys suggest that 0.6% of population are problem gamblers it is suggested for each these individuals, 10–17 other people, including children family members, affected. linked to many individual problems including: depression, suicide, significant debt, bankruptcy, conflict, domestic violence, neglect maltreatment offending. This makes issue central work territory. Yet, training workers UK...
Personalisation has become one of the grand narratives UK social policy in recent times, and care a number ways blazed trail that is now being followed by other public services into complex area giving users more genuine power to choose control nature those services. Perhaps reflecting some importance this development work, journal published major articles relating subject over last few years (four 2010, two 2011 so far 2012 as well several reviews books on theme). I was very pleased read...
The increased core electron temperature produced by ICRF heating of TFTR, D-T neutral-beam-heated supershot plasmas is expected to extend the alpha-particle slowing down time and hence enhance central pressure. In preparation for TFTR operational phase, which started in late 1993, a series experiments were conducted on explore effect performance stability low-recycling, deuterium 3He minority regime. coupling up 7.4 MW 47 MHz power full size (R approximately 2.62 m, 0.96 m), minority,...
In fast wave to ion Bernstein mode conversion experiments in DT supershot plasmas, localized efficient heating rather than electron was observed, which due Doppler broadened tritium cyclotron resonance overlap into the region. The temperature heat pulse associated with RF power modulation this regime could provide a diagnostic tool for measuring local thermal conductivity various confinement regimes. direct launch experiments, core coupling limited by excitation of parasitic edge modes....
When ICRF power is applied to TFTR plasmas in which there no externally supplied minority species, an enhanced loss of DD fusion products results. The occurs at the passing trapped boundary, and consists particles or near their birth energy. process appears be addition perpendicular velocity as they interact with waves, so that marginally are moved across boundary into first orbit cone. A simplified model this predicts losses a magnitude similar those seen. Extrapolations based upon these...
Abstract TFTR has begun its campaign to study deuterium-tritium fusion under reactor-like conditions. Variable amounts of deuterium and tritium neutral beam power have been used maximize power, alpha heating, investigate particle confinement, search for driven plasma instabilities. Additional areas include energy transport ICRF heating schemes DT plasmas, retention, in high βp plasmas. The majority this work is done the supershot confinement regime. To obtain supershots, extensive limiter...
Discharges with strongly peaked density profiles, peaking factor >4, have been produced on the Tokamak Fusion Test Reactor (TFTR) tokamak by deuterium pellet injection. Following perturbation, these plasmas heated using 3He or hydrogen minority ion cyclotron resonance heating (ICRH) at power levels up to 6 MW. As seen in experiments other devices, a strong transient enhancement of central plasma parameters, particular fusion reactivity and electron pressure, has observed discharges. The...
In this article we describe a simple fast pulse gas valve developed for use in plasma discharge experiment. The delivers 1017–1019 molecules per varied by changing the voltage on electromagnetic driver power supply. Valve widths are observed to be less than 300 μs full width at half maximum with rise time of 100 resulting flow rate ∼1022 second. An optical transmission technique was used determine mechanical opening and closing characteristics piston. A ionization gauge (FIG) diagnosis...