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Träfflista för sökning "WFRF:(Anderson D. R.) srt2:(1995-1999)"

Sökning: WFRF:(Anderson D. R.) > (1995-1999)

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  • Anderson, D., et al. (författare)
  • A variational approach to spherical aberrations in the thermal-wave model for beam dynamics in charged particle accelerators
  • 1998
  • Ingår i: Physica Scripta. - : Institute of Physics Publishing. - 0031-8949 .- 1402-4896. ; 58:6, s. 608-612
  • Tidskriftsartikel (refereegranskat)abstract
    • A direct variational approach involving trial functions and Ritz optimization, which has previously been found very useful in nonlinear optics, is applied to analyze the effects of spherical aberrations on the focusing properties of charged particle beams in particle colliders. As compared to conventional perturbation theory, the variational approach provides a simple and physically clear analysis. Explicit expressions are given for the transverse particle beam density, the spot size, and the luminosity reduction factor at the interaction point, in good agreement with the perturbative results. 
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  • Anderson, D., et al. (författare)
  • Modulational instabilities within the thermal wave model description of high energy charged particle beam dynamics
  • 1999
  • Ingår i: Physics Letters A. - : Elsevier. - 0375-9601 .- 1873-2429. ; 258:4-6, s. 244-248
  • Tidskriftsartikel (refereegranskat)abstract
    • Within the thermal wave model (TWM) description, an investigation was made of the longitudinal instability properties of a coasting high energy charged particle beam, where the interaction between the beam and its surroundings is characterized in terms of a complex impedance. The analysis is shown to correctly reproduce the characteristic features of the coherent instability as obtained previously by conventional techniques based on the Vlasov equation for the beam distribution. The results further validate the TWM approach as a consistent alternative description for analyzing the dynamics of high energy charged particle beams.
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  • Harvey, P, et al. (författare)
  • The electric field instrument on the Polar satellite
  • 1995
  • Ingår i: Space Science Reviews. - 0038-6308 .- 1572-9672. ; 71, s. 583-596
  • Tidskriftsartikel (refereegranskat)abstract
    • The Polar satellite carries a system of four wire booms in the spacecraft spin plane and two rigid booms along the spin axis. Each of the booms has a spherical sensor at its tip along with nearby guard and stub surfaces whose potentials relative to that of their sphere are controlled by associated electronics. The potential differences between opposite sphere pairs are measured to yield the three components of the DC to >1 MHz electric field. Spheres can also be operated in a mode in which their collected current is measured to give information on the plasma density and its fluctuations. The scientific studies to be performed by this experiment as well as the mechanical and electrical properties of the detector system are described.
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  • Resultat 1-9 av 9

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