Simulating Electron Clouds in High-Current Ion Accelerators with Solenoid Focusing

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Contamination from electrons is a concern for the solenoid-focused ion accelerators being developed for experiments in high-energy-density physics (HEDP). These electrons are produced directly by beam ions hitting lattice elements and intercepting diagnostics, or indirectly by ionization of desorbed neutral gas, and they are believed responsible for time dependence of the beam radius, emittance, and focal distance seen on the Solenoid Transport Experiment (STX) at Lawrence Berkeley National Laboratory. The electrostatic particle-in-cell code WARP has been upgraded to included the physics needed to simulate electron-cloud phenomena. We present preliminary self-consistent simulations of STX experiments suggesting that the observed time dependence ... continued below

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7 p. (0.1 MB)

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Sharp, W; Grote, D; Cohen, R; Friedman, A; Vay, J; Seidl, P et al. August 15, 2006.

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Contamination from electrons is a concern for the solenoid-focused ion accelerators being developed for experiments in high-energy-density physics (HEDP). These electrons are produced directly by beam ions hitting lattice elements and intercepting diagnostics, or indirectly by ionization of desorbed neutral gas, and they are believed responsible for time dependence of the beam radius, emittance, and focal distance seen on the Solenoid Transport Experiment (STX) at Lawrence Berkeley National Laboratory. The electrostatic particle-in-cell code WARP has been upgraded to included the physics needed to simulate electron-cloud phenomena. We present preliminary self-consistent simulations of STX experiments suggesting that the observed time dependence of the beam stems from a complicated interaction of beam ions, desorbed neutrals, and electrons.

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7 p. (0.1 MB)

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PDF-file: 7 pages; size: 0.1 Mbytes

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  • Presented at: 16th Internatioal Symposium on Heavy Ion Inertial Fusion, Saint Malo, France, Jul 10 - Jul 14, 2006

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  • Report No.: UCRL-PROC-223745
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 894003
  • Archival Resource Key: ark:/67531/metadc888273

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  • August 15, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • April 17, 2017, 12:45 p.m.

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Sharp, W; Grote, D; Cohen, R; Friedman, A; Vay, J; Seidl, P et al. Simulating Electron Clouds in High-Current Ion Accelerators with Solenoid Focusing, article, August 15, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc888273/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.