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Dissertation
Year: 1985 Publisher: Liège : Université de Liège. Faculté de médecine (ULg). Département de clinique et pathologie médicales,
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WATER POLLUTANTS --- WATER POLLUTION --- WASTE PRODUCTS --- SEWAGE --- GAMMA RAYS --- CONSERVATION OF NATURAL RESOURCES --- WATER MICROBIOLOGY --- WATER POLLUTANTS --- WATER POLLUTION --- WASTE PRODUCTS --- SEWAGE --- GAMMA RAYS --- CONSERVATION OF NATURAL RESOURCES --- WATER MICROBIOLOGY
Dissertation
ISBN: 9789086496747 Year: 2013 Publisher: Leuven Katholieke Universiteit Leuven
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Particle accelerators are among the most complicated contemporary devices and consist of a large number of components, each with a specific function. All components need to be tuned with respect to each other to achieve the prescribed particle beam characteristics. Seemingly small deviations from the components design specifications may induce irreversible aberration from the particle beam characteristics in subsequent accelerator components. Therefore both fast and accurate beam dynamics simulations of the accelerator as a whole are indispensable during design and operation of a particle accelerator. This thesis is devoted to the further development of beam dynamics simulations on the basis of the moment method, the Vlasov equation, surrogate field models obtained from electromagnetic field simulations and to the application thereof to Radio Frequency Quadrupoles (RFQs). In particular the thesis develops and validates standardised procedures for extracting accurate and reproducible surrogate field models from 3D electromagnetic field simulation results of several accelerator components (radio frequency cavities, solenoids, steerer magnets, Wien filters, dipole magnets, quadrupole magnets, sextupole magnets and octupole magnets). Furthermore an existing Vlasov solver for electrons is extended for the more general case of particles with an arbitrary charge and mass. Highly accurate CAD modelling tools have been developed, defining the modulated rods and the stems of an RFQ on the basis of the design specifications. Surrogate field models dedicated to the RFQs radial matcher cells, transition cells and cells for particle bunching, focussing and acceleration are built. They are derived from 3D electrostatic field simulation results of parts of the RFQ and their accuracy and robustness is validated thoroughly, both with theoretical and realistic RFQ models. The four-rod RFQ design for the 600 MeV proton accelerator as a segment of the MYRRHA research reactor, planned at SCKCEN, was employed as a realistic RFQ validation model. The surrogate field models are implemented into the Vlasov solver. The extended Vlasov solver in combination with the accurate surrogate field models calculates the beam dynamics in an RFQ in a few seconds, making the solver a valuable tool for the design and operation of RFQs.
academic collection --- 539.12 <043> --- Elementary and simple particles (charge less than 3 including alpha-rays, beta-rays, gamma-rays as individual particles or as radiation)--Dissertaties --- Theses --- 539.12 <043> Elementary and simple particles (charge less than 3 including alpha-rays, beta-rays, gamma-rays as individual particles or as radiation)--Dissertaties
Dissertation
ISBN: 9789086495214 Year: 2012 Publisher: Leuven Katholieke Universiteit Leuven
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The Standard Model of fundamental particles and their interactions is one of the most successful theories in physics. In particular, up to the weak scale (a few hundreds of GeV) it agrees to a great degree with a large set of experimental data. However, there are several theoretical reasons, such as the so-called "Hierarchy Problem", as well as experimental ones, such as the neutrino masses and the evidence for dark matter in the Universe, to expect that something new (particles and/or interactions) could lie at TeV scale. Hints and/or answer(s) to these fundamental questions will be provided by the Large Hadron Collider (LHC), a proton-proton collider running at high energies.The present thesis aims to explore new physics at the LHC through phenomenological studies that employ simulations and computational tools to directly link theories with experimental data. In particular, the focus is on Beyond Standard Model theories that can incorporate a quantum description of gravity, such as extra dimensional theories, Supersymmetry and yet a simplified model where the constant of Newton is scale dependent. Phenomenological analyses are performed in which graviton and gravitino emission in combination with multiple jets are investigated at hadron colliders. Inclusive samples are generated by merging matrix element with parton shower descriptions, and validated by a comparison against next-to-leading order QCD calculations. Predictions for relevant observables at the LHC and Tevatron are obtained.
academic collection --- 539.12 <043> --- 530.19 <043> --- 530.19 <043> Fundamental functions in general. Potential. Gradient. Intensity. Capacity etc.--Dissertaties --- Fundamental functions in general. Potential. Gradient. Intensity. Capacity etc.--Dissertaties --- 539.12 <043> Elementary and simple particles (charge less than 3 including alpha-rays, beta-rays, gamma-rays as individual particles or as radiation)--Dissertaties --- Elementary and simple particles (charge less than 3 including alpha-rays, beta-rays, gamma-rays as individual particles or as radiation)--Dissertaties --- Theses
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