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O'Shea, P.G.

Paper Title Page
WGA11 Simulation Studies of Halo Creation and Regeneration in Intense Charged Particle Beams 78
 
  • C. Papadopoulos, I. Haber, R.A. Kishek, P.G. O'Shea, M. Reiser
    UMD, College Park, Maryland
 
 

Beam halo is one of the major limiting factors to the effective transport of intense beams. In this paper, we use the WARP particle-in-cell code to numerically investigate the effect of different initial particle distributions on the properties of mismatch-induced halo. In particular, we use equilibrium and non-equilibrium distributions, the latter prompted by experimental measurements of the beam distribution in the University of Maryland Electron Ring (UMER). In both cases, we observe the phase space structure expected in the case of resonances between beam envelope oscillations and single-particle trajectories.

 
WGA31 Linear Resonance Analysis of Beams with Intense Space Charge in the University of Maryland Electron Ring (UMER) 165
 
  • C. Wu, E. Abed, B.L. Beaudoin, S. Bernal, R.A. Kishek, P.G. O'Shea, M. Reiser, D.F. Sutter
    UMD, College Park, Maryland
 
 

Space charge can significantly affect the resonant properties of rings. The University of Maryland Electron Ring is a scaled experiment in which we have circulated beams with unprecedented intensities. Here we discuss the resonance analysis performed using the electrostatic particle-in-cell code WARP, to understand the effect of space charge on the ring resonances. Beams with varying degrees of space charge in both the emittance- and space-charge-dominated regimes are attempted. The operating point is scanned to map the tune diagram under various lattice and injection errors. The results of the simulation study are compared to experimental measurements.

 

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