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Articles 1  6 of 6
FullText Articles in Physics
Investigation And Optimization Of A New Compact Superconducting Cavity For Deflecting And Crabbing Applications, Subashini Uddika De Silva
Investigation And Optimization Of A New Compact Superconducting Cavity For Deflecting And Crabbing Applications, Subashini Uddika De Silva
Physics Theses & Dissertations
Deflecting and crabbing structures have many applications in current accelerator systems. The primary use of a deflecting cavity is to separate a single beam into multiple beams. A crabbing cavity enables the headon collision at the interaction point in particle colliders in order to increase the luminosity. The early uses of the deflecting structures have been in the early 1960s: these structures were disk loaded structures operating at room temperature. The crabbing structure which was installed at the NEK electronpositron collider was the first and only operational superconducting cavity of that kind. The most common design of superconducting deflecting and ...
Application Of Chebyshev Formalism To Identify Nonlinear Magnetic Field Components In Beam Transport System, Michael Spata
Application Of Chebyshev Formalism To Identify Nonlinear Magnetic Field Components In Beam Transport System, Michael Spata
Physics Theses & Dissertations
An experiment was conducted at Jefferson Lab's Continuous Electron Beam Accelerator Facility to develop a beambased technique for characterizing the extent of the nonlinearity of the magnetic fields of a beam transport system. Horizontally and vertically oriented pairs of aircore kicker magnets were simultaneously driven at two different frequencies to provide a timedependent transverse modulation of the beam orbit relative to the unperturbed reference orbit. Fourier decomposition of the position data at eight different points along the beamline was then used to measure the amplitude of these frequencies. For a purely linear transport system one expects to find solely ...
Compensation Techniques In Accelerator Physics, Hisham Kamal Sayed
Compensation Techniques In Accelerator Physics, Hisham Kamal Sayed
Physics Theses & Dissertations
Accelerator physics is one of the most diverse multidisciplinary 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 applications. In this work, some basic theory regarding particle beam dynamics in accelerators will be presented. This basic theory, along with applying state of the art techniques in beam dynamics will be used in this dissertation to study and solve accelerator physics problems. Two ...
Nuclear Electromagnetic Currents In Chiral Effective Field Theory, Saori Pastore
Nuclear Electromagnetic Currents In Chiral Effective Field Theory, Saori Pastore
Physics Theses & Dissertations
A nucleonnucleon potential and consistent nuclear electromagnetic currents are derived in chiral effective field theory retaining pions and nucleons as explicit degrees of freedom. The calculation of the potential is carried out up to nexttonextto leading order (N^{2}LO), while the currents include up to N^{3}LO corrections. The potential at N^{2} LO and currents at N^{3}LO consist of twopionexchange and contact contributions. The currents are then utilized to study a number of lowenergy electromagnetic observables induced by magnetic dipole transitions, such as the deuteron and trinucleon magnetic moments and the np, nd and n ...
Investigation Of The Superconducting Properties Of Niobium RadioFrequency Cavities, Gianluigi Ciovati
Investigation Of The Superconducting Properties Of Niobium RadioFrequency Cavities, Gianluigi Ciovati
Physics Theses & Dissertations
Radiofrequency (rf) superconducting cavities are widely used to increase the energy of a charged particle beam in particle accelerators. The maximum gradients of cavities made of bulk niobium have constantly improved over the last ten years and they are approaching the theoretical limit of the material. Nevertheless, rf tests of niobium cavities are still showing some "anomalous" losses (socalled "Qdrop"), characterized by a marked increase of the surface resistance at high rf fields, in absence of field emission. A low temperature "insitu" baking under ultrahigh vacuum has been successfully applied by several laboratories to reduce those losses and improve ...
Surface Resistance Measurements Of Superconducting Niobium Samples With A Triaxial Cavity, Paul Martin Boccard
Surface Resistance Measurements Of Superconducting Niobium Samples With A Triaxial Cavity, Paul Martin Boccard
Physics Theses & Dissertations
This experimental study has revealed and investigated many of the physical issues that affect accurate measurement of the surface resistance for small samples consisting of superconducting niobium films on copper substrates. It is believed that this work provides the groundwork for future research directed towards solving this important problem. Accurate measurement of surface resistance for such samples is needed to allow the rapid evaluation and optimization of the deposition parameters necessary for manufacturing lowloss superconducting niobium films.
A superconducting niobium triaxial cavity was investigated to determine its suitability for measuring the residual surface resistance of copper samples that were sputtercoated ...