Hollow microspheres as targets for staged laser-driven proton acceleration

Burza, M and Gonoskov, A and Genoud, G and Persson, A and Svensson, K and Quinn, M and McKenna, P and Marklund, M and Wahlström, C-G (2011) Hollow microspheres as targets for staged laser-driven proton acceleration. New Journal of Physics, 13. 013030. ISSN 1367-2630

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    Abstract

    A coated hollow core microsphere is introduced as a novel target in ultra-intense laser-matter interaction experiments. In particular, it facilitates staged laser-driven proton acceleration by combining conventional target normal sheath acceleration (TNSA), power recycling of hot laterally spreading electrons and staging in a very simple and cheap target geometry. During TNSA of protons from one area of the sphere surface, laterally spreading hot electrons form a charge wave. Due to the spherical geometry, this wave refocuses on the opposite side of the sphere, where an opening has been laser micromachined. This leads to a strong transient charge separation field being set up there, which can post-accelerate those TNSA protons passing through the hole at the right time. Experimentally, the feasibility of using such targets is demonstrated. A redistribution is encountered in the experimental proton energy spectra, as predicted by particle-in-cell simulations and attributed to transient fields set up by oscillating currents on the sphere surface.

    ORCID iDs

    Burza, M, Gonoskov, A, Genoud, G, Persson, A, Svensson, K, Quinn, M, McKenna, P ORCID logoORCID: https://orcid.org/0000-0001-8061-7091, Marklund, M and Wahlström, C-G;
    • Item type:Article
      ID code:31306
      Dates:
      Date
      Event
      21 January 2011
      Published
      Keywords:thin foils, intensity, generation, contrast, pulses, beams, ions, Physics, Physics and Astronomy(all)
      Subjects:Science > Physics
      Department:Faculty of Science > Physics
      Depositing user: Pure Administrator
      Date deposited:20 May 2011 13:43
      Last modified:18 Oct 2021 12:10
      Related URLs:
      URI:https://strathprints.strath.ac.uk/id/eprint/31306
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