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 46 for “"Particle accelerators"”.
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Investigation of windowless gas target system for particle accelerators
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1998.
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Micron precision calibration methods for alignment sensors in particle accelerators
Large Hadron Collider (LHC) at CERN, the European Organization for Nuclear Research, has, on each side of its four experiments, a set of three magnets, called low-beta magnets. These magnets provide the final-focus for the beams that collide head on in the experiments. The magnets have to be …
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Photonic band gap structures for superconducting radio-frequency particle accelerators
… superconducting radio-frequency (SRF) electron accelerators. It has five accelerating cells: four cells of elliptical shape, commonly used for SRF cavities, and one PBG cell in the middle. The purpose of the PBG cell is to damp unwanted Higher-Order electromagnetic Modes (HOMs) in the structure. …
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Studying quantum correlations and multi-hadron states using high energy quasi-real photons
Physicists use particle accelerators to probe the fundamental structure of matter by colliding particles at energies sufficient to resolve sub-nuclear degrees of freedom. The resulting final states provide insight into the underlying dynamics of nature, enabling the discovery of new particles, the …
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Microwave accelerating structures: an innovative parallel coupled electron LINAC
Particle accelerators are employed in many fields of the physics, engineering and medicine science. Although the idea of acceleration of charged particles by means of time varying electromagnetic field is an almost century old, the research and development in this field is active more than ever. An …
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Advanced Characterization of Materials for Superconducting Radiofrequency Accelerator Cavities
Particle accelerators are a leading tool for frontier science. Pushing that frontier further demands more machines with higher performance, and more of a very expensive technology: superconducting radio-frequency (SRF) acceleration. From a materials perspective this means reducing residual surface …
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Final Muon Cooling For A Muon Collider
… the new energy frontier, a new generation of particle accelerators is needed. Muon colliders are a promising alternative if muon cooling can be made to work. Muons are 200 times heavier than electrons, so they produce less synchrotron radiation, and they behave like point particles. However, …
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Identifying boosted objects with N-subjettiness and linear k-means clustering
… a particular focus on tagging top quarks) at particle accelerators such as the Large Hadron Collider. Combined with an invariant mass cut on jets, N-subjettiness is a powerful discriminating variable for tagging boosted objects such as top quarks and rejecting the fake background of QCD jets …
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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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Monte Carlo simulation and experimental studies of the production of neutron-rich medical isotopes using a particle accelerator.
… the production of radioisotopes using charged-particle accelerators instead of nuclear reactors is gaining increasing popularity. The main advantages of producing medical isotopes with accelerators are carrier free radionuclides of short lived isotopes, improved handling, reduction of the …
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Energetic Deposition of Niobium Thin Film in Vacuum
… inclusions commonly seen in solid niobium. For particle accelerators, niobium thin film has the potential to replace the solid niobium in the making of the accelerating structures. In order to understand and improve the superconducting performance of niobium thin films at cryogenic temperature, …
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Studies of Light Scalar Particles and Dressed Gauge Propagators in QCD
… their hadronisation after hard interactions at particle accelerators such as the LHC. However, the theoretical framework linking the fundamental Lagrangian of QCD to the mesons and baryons observed in experiment is still in development. The states observed by experiments can be investigated …
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Dynamic Resistance of High-Tc Superconductor and Its Application in Flux Pumped Superconducting Magnets
… areas such as magnetic resonance imaging (MRI), particle accelerators, and magnetic levitation systems. Flux pumping is a promising technology for energizing and operating High-Tc superconducting magnets in a relatively cost effective manner. This thesis first presents a thorough study on the …
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Beam characterization for accelerator-based boron neutron capture therapy using the ⁹Be(d,n) nuclear reaction
… and is accessible to inexpensive, small particle accelerators.
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Beam-Induced Radiation Heating on the Superconducting Undulator at the Advanced Photon Source
… models of similar superconducting devices in accelerators have reached at best 200% difference between the measured and modeled heat load. The beam heat load model presented in this thesis represents a significant improvement in modeling of superconducting devices in high energy particle …
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Nonlinear Dynamics of Vortices in Different Types of Grain Boundaries
<p>As a major component of linear particle accelerators, superconducting radio-frequency (SRF) resonator cavities are required to operate with lowest energy dissipation and highest accelerating gradient. SRF cavities are made of polycrystalline materials in which grain boundaries can limit maximum …
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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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Frequency and phase locking of a CW magnetron : with a digital phase locked loop using pushing characteristics
… of -40 dBc) creating a suitable RF source for particle accelerators and other sophisticated applications. We will go on to discuss the characterization of the magnetron with differing heater powers and load conditions when operated with a low cost switched mode power supply. We similarly …
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Bootstrap Techniques in Flat Space and Cosmology
… a veil of high energies that we cannot access in particle accelerators. Physics of the early Universe can instead be studied by identifying its effects on cosmological fluctuations produced in the early Universe, which are responsible for the anisotropies of the Cosmic Microwave Background and the …
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Dosimetry calibration for low-energy protons produced in the ECU accelerator laboratory
… 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 localized volume inside …
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