Collective Focusing of Intense Ion Beam Pulses for High-energy Density Physics Applications

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The collective focusing concept in which a weak magnetic lens provides strong focusing of an intense ion beam pulse carrying a neutralizing electron background is investigated by making use of advanced particle-in-cell simulations and reduced analytical models. The original analysis by Robertson Phys. Rev. Lett. 48, 149 (1982) is extended to the parameter regimes of particular importance for several high-energy density physics applications. The present paper investigates (1) the effects of non-neutral collective focusing in a moderately strong magnetic field; (2) the diamagnetic effects leading to suppression of the applied magnetic field due to the presence of the beam pulse; ... continued below

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Mikhail A. Dorf, Igor D. Kaganovich, Edward A. Startsev and Ronald C. Davidson April 27, 2011.

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The collective focusing concept in which a weak magnetic lens provides strong focusing of an intense ion beam pulse carrying a neutralizing electron background is investigated by making use of advanced particle-in-cell simulations and reduced analytical models. The original analysis by Robertson Phys. Rev. Lett. 48, 149 (1982) is extended to the parameter regimes of particular importance for several high-energy density physics applications. The present paper investigates (1) the effects of non-neutral collective focusing in a moderately strong magnetic field; (2) the diamagnetic effects leading to suppression of the applied magnetic field due to the presence of the beam pulse; and (3) the influence of a finite-radius conducting wall surrounding the beam cross-section on beam neutralization. In addition, it is demonstrated that the use of the collective focusing lens can significantly simplify the technical realization of the final focusing of ion beam pulses in the Neutralized Drift Compression Experiment-I (NDCX-I) , and the conceptual designs of possible experiments on NDCX-I are investigated by making use of advanced numerical simulations. 2011 American Institute of Physics

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  • Physics of Plasmas (February 2011)

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  • Report No.: PPPL-4615
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 1013056
  • Archival Resource Key: ark:/67531/metadc840519

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  • April 27, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 3:01 p.m.

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Mikhail A. Dorf, Igor D. Kaganovich, Edward A. Startsev and Ronald C. Davidson. Collective Focusing of Intense Ion Beam Pulses for High-energy Density Physics Applications, report, April 27, 2011; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc840519/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.