Micro-sphere layered targets efficiency in laser driven proton acceleration
- CEA, IRAMIS, SPAM, F-91191 Gif-sur-Yvette (France)
- FNSPE, Czech Technical University in Prague, CR-11519 Prague (Czech Republic)
- Institute of Physics v.v.i. ASCR, Na Slovance 1999, Prague (Czech Republic)
- Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche, research unit “Adriano Gozzini,” Via G. Moruzzi 1, 56124 Pisa (Italy)
- Dipartimento di Energia, Politecnico di Milano, Milano (Italy)
- LULI, UMR7605, CNRS-CEA-Ecole Polytechnique-Paris 6, 91128 Palaiseau (France)
Proton acceleration from the interaction of high contrast, 25 fs laser pulses at >10{sup 19} W/cm{sup 2} intensity with plastic foils covered with a single layer of regularly packed micro-spheres has been investigated experimentally. The proton cut-off energy has been measured as a function of the micro-sphere size and laser incidence angle for different substrate thickness, and for both P and S polarization. The presence of micro-spheres with a size comparable to the laser wavelength allows to increase the proton cut-off energy for both polarizations at small angles of incidence (10∘). For large angles of incidence, however, proton energy enhancement with respect to flat targets is absent. Analysis of electron trajectories in particle-in-cell simulations highlights the role of the surface geometry in the heating of electrons.
- OSTI ID:
- 22218092
- Journal Information:
- Journal of Applied Physics, Vol. 114, Issue 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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