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.
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Showing 1 to 20 of 24 for “"Particle beams"”.
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Interaction of charged particle beams with plasmas
This thesis focuses on the propagation of charged particle beams in plasmas, and is divided into two main parts. In the second chapter, a novel theoretical model for underdense electron beam propagation during the nonlinear stage of the resistive Weibel instability (WI) is presented and is used to …
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Inverse problems in elliptic charged-particle beams
The advantages of elliptic (or sheet) beams have been known for many years, but their inherent three-dimensional nature presents significant theoretical, design, and experimental challenges in the development of elliptic beam systems. The present work provides a framework for the design of elliptic …
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Transport of elliptic intense charged -particle beams
… theory of high-intensity elliptic charged-particle beams is presented. In particular, the halo formation and beam loss problem associated with the high space charge and small-aperture structure is addressed, and a novel transport theory of large-aspect-ratio elliptic beams has been …
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Green's function analysis of bunched charged particle beams
… the dynamics and equilibrium of bunched charged particle beams in the presence of perfectly conducting walls using a Green's function technique. Exact self-consistent electric and magnetic fields are obtained for charged particles in the vicinity of a conducting boundary with the use of Green's …
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Thermal equilibrium theory of periodically focused charged-particle beams
… theory of periodically focused charged-particle beams is presented in the framework of both warm-fluid and kinetic descriptions. In particular, the thermal beam equilibria are discussed for paraxial beams in periodic solenoidal and quadrupole magnetic focusing fields, and the theory is …
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Large-Angle Beamstrahlung: Simulation And Diagnostics
<p>LARGE-ANGLE BEAMSTRAHLUNG: SIMULATION AND DIAGNOSTICS</p> <p>by</p> <p>RYAN S. GILLARD</p> <p>May 2014</p> <p>Advisor: Dr. Giovanni Bonvicini </p> <p>Major: Physics </p> <p>Degree: Doctor of Philosophy </p> <p> Luminosity is paramount in high energy physics research, therefore it is critical to …
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Dual Neutral Particle Beam Interrogation of Intermodal Shipping Containers for Special Nuclear Material
… detection. Active interrogation using neutral particle beams to induce fission in SNM is a method under consideration. One by-product of fission is the creation of fragments that undergo radioactive decay over a time period on the order of tens of seconds after the initial event. The delayed' …
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Compensation Techniques in Accelerator Physics
… fields of physics, wherein the dynamics of particle beams is studied. It takes more than the understanding of basic electromagnetic interactions to be able to predict the beam dynamics, and to be able to develop new techniques to produce, maintain and deliver high quality beams for different …
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Combined methods and instrumentation for dosimetric monitoring of the large fluence hadron irradiations /
… and matter delivered by ionizing radiation or particle beams. Dosimetry is widely applied in the field of medical physics where it is inevitable for assessment of the radiation dose received by personnel and patients. Then radiation dose refers to the amount of energy deposited in matter and …
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Didelių įtėkių hadronų apšvitų dozimetrijos kombinuoti metodai ir įranga /
… and matter delivered by ionizing radiation or particle beams. Dosimetry is widely applied in the field of medical physics where it is inevitable for assessment of the radiation dose received by personnel and patients. Then radiation dose refers to the amount of energy deposited in matter and …
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Laser-Produced Plasmas for Particle Acceleration
… that aim to stabilise and optimise laser-based particle accelerators. The technique is called laser wakefield acceleration, where electric fields of the order of 102 GV/m accelerate electrons to high energies (⇠102 MeV) over mm-distances in laser-produced plasmas. Among the prerequisites for …
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Electrostatic Trapping as a Self-Consistent Phenomenon in Plasmas and other Collective Systems
… systems. They are coherent structures in which particles become trapped in the wave potential. These phenomena require a kinetic description i.e. a description in which the velocity distribution of the particles is taken into account. Trapping structures extend the areas in configuration space …
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Dosimetry calibration for low-energy protons produced in the ECU accelerator laboratory
… the available modalities, proton and heavy-ion beams produced by particle accelerators have been widely recognized as highly effective techniques for cancer treatment. A key advantage of these particle beams is their ability to deposit the majority of their energy within a well-defined and …
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Optical and X-ray studies of newly discovered flare stars
… evidence for the existence of '-.s (1-3) MeV particle beams. Although this phenomenon has previously been reported on the Sun for Ha and X-ray lines of CaXIX and FeXXV, and symmetric and asymmetric broadening of the Balmer and Ca II H & K lines has also been observed at low time resolution (> …
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Investigation of laser-driven particle acceleration for the development of tunable ion sources for applications in high energy density science
… the use of these high-intensity lasers to drive particle beams. Possible applications of these particle sources include isotope production for medical applications, proton cancer therapy, and fusion energy schemes. This thesis focuses on laser-driven proton acceleration and adds to the existing …
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High-Throughput Mapping of The Biological Effects of Particle Therapy
… in the cure of many cancer patients. Charged particle based radiation therapies are gaining momentum as the physical dose distributions of ions are superior to standard photons due their limited range. Additionally, charged particle radiation has been shown to have linear energy transfer (LET) …
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Investigation of Microbunching Instabilities in Modern Recirculating Accelerators
Particle accelerators are machines to accelerate and store charged particle beams, such as electrons or protons, to the energy levels for various scientific applications. There are three basic types of particle accelerators: linear accelerators (linac), storage-ring (or circular) accelerators, and …
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Engineering ionic liquid ion sources for ion beam applications
… of producing positive and negative molecular ion beams through field evaporation from room-temperature molten salts. If sufficiently high hydraulic impedance from the liquid-supporting emitter is provided such that the ratio of flow rate Q to liquid's electrical conductivity K is sufficiently …
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Long-term Performance of a concrete-lined Tunnel at CERN
… laboratory conditions, two high-energy particle beams travel close to the speed of light around the most powerful particle accelerator ever built. The accelerator runs through a deep network of underground tunnels and caverns. To forefront the boundaries of experimental physics, CERN …
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Monte Carlo simulations, in vitro and in vivo experimental verifications for preclinical studies
… using two radiation qualities (X-ray and alpha particle beams). - Biological effectiveness along SOBP by means of in vivo experiments using skin deterministic damage as endpoint in mice. Nevertheless, further studies are necessary to assess and quantify the RBE variations along the Bragg peak. A …
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