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.
| Original language | English |
|---|---|
| Article number | 013030 |
| Number of pages | 14 |
| Journal | New Journal of Physics |
| Volume | 13 |
| DOIs | |
| Publication status | Published - 21 Jan 2011 |
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Keywords
- thin foils
- intensity
- generation
- contrast
- pulses
- beams
- ions
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Hollow microspheres as targets for staged laser-driven proton acceleration. / Burza, M; Gonoskov, A; Genoud, G; Persson, A; Svensson, K; Quinn, M; McKenna, P; Marklund, M; Wahlström, C-G.
In: New Journal of Physics, Vol. 13, 013030, 21.01.2011.Research output: Contribution to journal › Article
TY - JOUR
T1 - Hollow microspheres as targets for staged laser-driven proton acceleration
AU - Burza, M
AU - Gonoskov, A
AU - Genoud, G
AU - Persson, A
AU - Svensson, K
AU - Quinn, M
AU - McKenna, P
AU - Marklund, M
AU - Wahlström, C-G
PY - 2011/1/21
Y1 - 2011/1/21
N2 - 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.
AB - 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.
KW - thin foils
KW - intensity
KW - generation
KW - contrast
KW - pulses
KW - beams
KW - ions
UR - http://www.scopus.com/inward/record.url?scp=79251586546&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/13/1/013030
DO - 10.1088/1367-2630/13/1/013030
M3 - Article
VL - 13
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
M1 - 013030
ER -