Self-consistent 3D simulations of longitudinal halo in rf -linacs

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In order to prevent activation of the beam pipe walls and components of a high power ion accelera- tor: beam loss must be minimized. Here we present self-consistent, 3D particle-in-cell simulations of longi- tudinally mismatched beams including the effects of rf non-linearities using parameters based on the Acceler- ator Production of Tritium linac design. In particular, we explore the evolution of the longitudinal halo distri- bution, i.e., the distribution of particles in longitudinal phase space with oscillation amplitudes significantly larger than amplitudes of particles in the main body or ''core'' of the beam. When a particle reaches a suf- ficiently ... continued below

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Barnard, J J; Lund, S M & Ryne, R D August 19, 1998.

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In order to prevent activation of the beam pipe walls and components of a high power ion accelera- tor: beam loss must be minimized. Here we present self-consistent, 3D particle-in-cell simulations of longi- tudinally mismatched beams including the effects of rf non-linearities using parameters based on the Acceler- ator Production of Tritium linac design. In particular, we explore the evolution of the longitudinal halo distri- bution, i.e., the distribution of particles in longitudinal phase space with oscillation amplitudes significantly larger than amplitudes of particles in the main body or ''core'' of the beam. When a particle reaches a suf- ficiently large amplitude longitudinally it can he lost from the rf bucket and consequently loses synchro- nism with thr rf wave. Such particles will lose energy and so be poorly matched to the transverse focusing field and consequently can be lost transversely. We compare the present simulations in which all particles contribute self-consistently to the self-field to predic- tions of a core/test particle model in which the core distribution has uniformly distributed charge and does not evolve self-consistently. Effects of self-consistent, non-linear space-charge forces, non-linear rf focusing on envelope mismatch induced beam halo are explored through comparisons of both models.

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595 Kilobytes

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  • 19th International Linear Accelerator Conference, Chicago, IL, August 23-28, 1998

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  • Other: DE00004588
  • Report No.: UCRL-JC-130696
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 4588
  • Archival Resource Key: ark:/67531/metadc684016

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  • August 19, 1998

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 24, 2016, 4:07 p.m.

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Barnard, J J; Lund, S M & Ryne, R D. Self-consistent 3D simulations of longitudinal halo in rf -linacs, article, August 19, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc684016/: accessed July 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.