Simulations of neutralized final focus

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In order to drive an inertial fusion target or study high energy density physics with heavy ion beams, the beam radius must be focused to < 3 mm and the pulse length must be compressed to < 10 ns. The conventional scheme for temporal pulse compression makes use of an increasing ion velocity to compress the beam as it drifts and beam space charge to stagnate the compression before final focus. Beam compression in a neutralizing plasma does not require stagnation of the compression, enabling a more robust method. The final pulse shape at the target can be programmed by ... continued below

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Welch, D.R.; Rose, D.V.; Genoni, T.C.; Yu, S.S. & Barnard, J.J. January 18, 2005.

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Description

In order to drive an inertial fusion target or study high energy density physics with heavy ion beams, the beam radius must be focused to < 3 mm and the pulse length must be compressed to < 10 ns. The conventional scheme for temporal pulse compression makes use of an increasing ion velocity to compress the beam as it drifts and beam space charge to stagnate the compression before final focus. Beam compression in a neutralizing plasma does not require stagnation of the compression, enabling a more robust method. The final pulse shape at the target can be programmed by an applied velocity tilt. In this paper, neutralized drift compression is investigated. The sensitivity of the compression and focusing to beam momentum spread, plasma, and magnetic field conditions is studied with realistic driver examples. Using the 3D particle-in-cell code, we examine issues associated with self-field generation, stability, and vacuum-neutralized transport transition and focusing.

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  • 15th International Symposium on Heavy IonInertial Fusion, Princeton, NJ, 06/7-11/2004

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  • Report No.: LBNL--56921
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 859929
  • Archival Resource Key: ark:/67531/metadc787457

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  • January 18, 2005

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 1, 2016, 7:50 p.m.

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Welch, D.R.; Rose, D.V.; Genoni, T.C.; Yu, S.S. & Barnard, J.J. Simulations of neutralized final focus, article, January 18, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc787457/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.