Laser driven MeV proton beam focussing by auto-charged electrostatic lens configuration

S. Kar, M. Zepf, K. Markey, P. Simpson, C. Bellei, J. Green, B. Dromey, S. Nagel, S. Kneip, L. Williangle, D. C. Carroll, P. McKenna, Z. Najmuddin, K. Krushelnick, P. Norreys, E. Clark, R. J. Clark, D. Neely, M. Borghesi, A. Schiavi

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Abstract

Laser driven multi-MeV proton beams from the rear surface of solid targets have been the
subject of significant interest in last few years, due to their potential applications in various
fields of science [1]. Despite of unique beam characteristics, such as low emittance, short burst
duration and high particle energies there is still need for development. The large divergence
angle and the broad energy spectrum are undesirable in most applications. Significant reduction
of the inherent large divergence of the laser driven MeV proton beams has been achieved
by strong (of the order of 109 V/m) electrostatic focusing field generated in the confined region
of a ’washer’ type target geometry attached to the proton generating foil. In this scheme,
the self charging of the target to multi-MV positive potential [2] is exploited to form a focusing
field in suitable target geometries. A significant reduction in the proton beam divergence,
and commensurate increase in the proton flux has been observed while preserving low beam
emittance. The underlying mechanism has been verified using particle tracking simulations.
Original languageEnglish
Title of host publication34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts
Place of PublicationMulhouse, France
Number of pages4
Volume31F
Publication statusPublished - 1 Dec 2007
Event34th European Physical Society Conference on Plasma Physics 2007, EPS 2007 - Warsaw, Poland
Duration: 2 Jul 20076 Jul 2007

Conference

Conference34th European Physical Society Conference on Plasma Physics 2007, EPS 2007
CountryPoland
CityWarsaw
Period2/07/076/07/07

Keywords

  • Laser driven multi-MeV proton beams
  • VULCAN petawatt laser system
  • laser pulses
  • flat foil targets

Cite this

Kar, S., Zepf, M., Markey, K., Simpson, P., Bellei, C., Green, J., Dromey, B., Nagel, S., Kneip, S., Williangle, L., Carroll, D. C., McKenna, P., Najmuddin, Z., Krushelnick, K., Norreys, P., Clark, E., Clark, R. J., Neely, D., Borghesi, M., & Schiavi, A. (2007). Laser driven MeV proton beam focussing by auto-charged electrostatic lens configuration. In 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts (Vol. 31F). [O-4.020].