Preliminary results from a scaled final focus experiment for heavy ion inertial fusion

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Vacuum ballistic focusing may be a straightforward method to obtain the heavy ion beam spot size necessary to drive an inertial confinement fusion target. Proper scaling of particle energy, mass, beam current, beam emittance, and magnetic field replicates the dynamics of a full driver beam in a small laboratory experiment. By expanding the beam and then focusing to a very small spot, the effects of aberrations and space charge on this method of final focus can be studied. To date, 200 {micro}A of 120keV K{sup +} has been focused to test the matching and focusing elements. A recently designed high ... continued below

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3 pages

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MacLaren, S.; Faltens, A.; Henestroza, E.; Ritchie, G. & Seidl, P. March 29, 1999.

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Vacuum ballistic focusing may be a straightforward method to obtain the heavy ion beam spot size necessary to drive an inertial confinement fusion target. Proper scaling of particle energy, mass, beam current, beam emittance, and magnetic field replicates the dynamics of a full driver beam in a small laboratory experiment. By expanding the beam and then focusing to a very small spot, the effects of aberrations and space charge on this method of final focus can be studied. To date, 200 {micro}A of 120keV K{sup +} has been focused to test the matching and focusing elements. A recently designed high brightness contact ionization source is being tested for upcoming focusing measurements with an 87 {micro}A Cs beam that will duplicate the dynamics of a proposed driver design at one-tenth scale. Transverse phase space and beam current density at various stages of the focus will be presented. Follow-on measurements studying electron neutralization of space charge and its effect on the focus will be explored.

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3 pages

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INIS; OSTI as DE00779710

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  • 1999 Particle Accelerator Conference, New York City, NY (US), 03/29/1999--04/02/1999

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  • Report No.: LBNL--42460
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 779710
  • Archival Resource Key: ark:/67531/metadc722816

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  • March 29, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 5, 2016, 5:05 p.m.

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MacLaren, S.; Faltens, A.; Henestroza, E.; Ritchie, G. & Seidl, P. Preliminary results from a scaled final focus experiment for heavy ion inertial fusion, article, March 29, 1999; California. (digital.library.unt.edu/ark:/67531/metadc722816/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.