Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 47 for “"Energetic particles"”.
-
Energetic particles in the earth's magnetospheric cusps
… answer the question, what is the source of the energetic particle population in the cusp? Since the initial observations measuring the energetic component were made, the source of the energetic population has been open to conjecture. A number of sources have been proposed: (1) the terrestrial …
-
Energetic Particles and Ionization in the Middle and Low Latitude Ionosphere
Made available in DSpace on 2014-12-12T20:54:44Z (GMT). No. of bitstreams: 1 7804187.pdf: 11550847 bytes, checksum: a2c3365db03c6bf80469ff6df9cb5a26 (MD5) Previous issue date: 1977
-
A statistical study of plasmawaves and energetic particles in the outer magnetosphere
The Earth magnetosphere contains energetic particles undergoing specific motions around Earth's magnetic field, and interacting with a variety of waves. The dynamics of energetic particles are often described in terms of three kinds of adiabatic invariants. Energetic electrons are often unstable to …
-
Observation and study of giga electron volt solar energetic particles using the Milagrito extensive air shower detector
… events can lead to an understanding of the solar energetic particle acceleration mechanism(s). Although the energy source of these mechanisms is known to reside in the solar magnetic field, the details of the acceleration process(es) have continued to elude researchers. By observing the particle …
-
Diagnostics of solar flare energetic particles: neglected hard X-ray processes and neutron astronomy in the inner heliosphere
… thesis dissertation, we have been studying some energetic processes in solar flares. On our work on hard X-ray (HXR) emission from flares, we have shown that non-thermal recombination emission can compare with the bremsstrahlung HXR flux for certain flare conditions. In this thesis, we show …
-
Investigation of Alfvén eigenmodes in Alcator C-Mod using active MHD spectroscopy
… devices may be important for the confinement of energetic particles, particularly fusion-born alpha particles in burning plasma experiments. Interaction between these energetic particles and weakly damped toroidal Alfvén eigenmodes (TAE's) may cause anomalous particle transport leading to …
-
Numerical simulation of the Jovian torus-driven plasma transport
… torus is opposed by pressure gradients in the energetic particles outside the torus. Many simulations have been performed for cases where the overall system is inter-change unstable under the ideal-MHD assumption E + v $\times$ B = 0. For such cases, the torus breaks up predominantly into long …
-
Particles in Plasma Processing Reactors: Modeling Nucleation, Transport, and Interparticle Effects to Reduce Wafer Contamination
… is also affected by Coulomb interactions between particles. Experimental observations showed that in trapping sites particles form clouds and move collectively. We numerically investigated Coulomb interactions between particles. In rf discharges, ordered systems (Coulomb liquids or solids) occur …
-
Frequency chirping of energetic particle driven modes in tokamaks; Self-consistent modelling and simulation
… of an initially unstable plasma wave driven by energetic particles may lead to the emergence of chirping waves. In toroidal configurations, these waves can lead to ejection of the particles from the hot core of the plasma and degrade the machine performance. Therefore, it is essential to develop …
-
Frequency chirping of energetic particle driven modes in tokamaks; Self-consistent modelling and simulation
… of an initially unstable plasma wave driven by energetic particles may lead to the emergence of chirping waves. In toroidal configurations, these waves can lead to ejection of the particles from the hot core of the plasma and degrade the machine performance. Therefore, it is essential to develop …
-
Characterization of mono-energetic charged-particle radiography for high energy density physics experiments
… glass capsule - the backlighter - provides monoenergetic 15-MeV and 3-MeV protons and 3.6-MeV alphas for radiographing these various phenomena. Because the backlighter emits mono-energetic particles, information about areal density and electromagnetic fields in imaged systems can be obtained …
-
Heavy quark symmetry in the soft collinear effective theory
… effects in nonleptonic decays of ... mesons with energetic particles in the final state. An introduction to Soft Collinear Effective Theory (SCET), the appropriate effective field theory of QCD for such decays, is given. We focus on decays of the type ... where M is a light energetic meson of …
-
Fast photodiode diagnostic on Alcator C-Mod tokamak to study the plasma edge/SOL structure
… minor radius R and r respectively, the charged particles are confined by the superposition of a toroidal and a poloidal magnetic field. In order to study the transport processes that lead to the removal of energetic particles from the hot plasma, two tangentially viewing optical diagnostics have …
-
Molecular dynamics studies of the interactions of low energy particles and clusters with surfaces
"The interaction of energetic particles and clusters with metal surfaces has been investigated using molecular dynamics computer simulations. For the particle interactions, a previously unknown mechanism for producing damage at surfaces, involving viscous flow of molten matter, was uncovered in …
-
Characterization of water-based liquid scintillator response to gammas and neutrons at varying scintillator-surfactant concentrations
… scintillator to take spectroscopic data of these energetic particles. However, material and chemical concerns make such experiments both challenging and costly. In their work, Winn and Raftery prepose a method of water-based scintillator as a viable alternative to liquid organic scintillator. …
-
Energy localization and heat generation in composite energetic systems under high-frequency mechanical excitation
… plastic bonded explosives, as well as single energetic particles embedded within a viscoelastic binder, is studied. In this work, the fundamental mechanisms associated with the conversion of high-frequency mechanical excitation to heat as applied to these composite energetic systems are …
-
Electron equations of state during magnetic reconnection
… a wide range of environments. It is a source of energetic particles in the solar corona and wind, and in planetary magnetospheres. Disruptive reconnection in laboratory fusion experiments rapidly deconfines the plasma. While reconnection alters the global magnetic field and plasma properties, it …
-
Radiation of VLF/ELF waves from a magnetospheric tether
The high energy particles of the Van Allen belts coming from cosmic rays, solar storms, high altitude nuclear explosions (HANEs) and other processes represent a significant danger to humans and spacecraft operating in those regions, as well as an obstacle to exploration and development of space …
-
Studies on the ion-droplet mixed regime in colloid thrusters
… characterization. Droplets are the most energetic particles in the beam, while ions are emitted with energies that overlap those of the droplets but extend down a few hundreds of volts in comparison. A small fraction of the ion current is emitted from the jet breakup region with …
Page 1 of 3