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. 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.
Author(s): | Burza, M, Gonoskov, A, Genoud, G, Persson, A, Svensson, K, Quinn, M, McKenna, P ![]() | Item type: | Article |
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ID code: | 31306 |
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: | 26 Jul 2019 02:18 |
Related URLs: | |
URI: | https://strathprints.strath.ac.uk/id/eprint/31306 |
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