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 (https://doi.org/10.1088/1367-2630/13/1/013030)
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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.
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Item type: Article ID code: 31306 Dates: DateEvent21 January 2011PublishedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 20 May 2011 13:43 Last modified: 14 Apr 2024 00:24 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/31306