Scientific Results

Micro-sphere layered targets efficiency in laser driven proton acceleration

Year: 2013

Authors: Floquet V., Klimo O., Psikal J., Velyhan A., Limpouch J., Proska J., Novotny F., Stolcova L., Macchi A., Sgattoni A., Vassura L., Labate L., Baffigi F., Gizzi L.A., Martin Ph., Ceccotti T.

Autors Affiliation: 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 Fisica “Enrico Fermi,” Università di Pisa, largo Bruno Pontecorvo 3, 56127 Pisa, Italy
Dipartimento di Energia, Politecnico di Milano, Milano, Italy
LULI, UMR7605, CNRS-CEA-Ecole Polytechnique-Paris 6, 91128 Palaiseau, France
Dipartimento SBAI, Università di Roma “La Sapienza,” Via A. Scarpa 14, 00161 Roma, Italy

Abstract: Proton acceleration from the interaction of high contrast, 25 fs laser pulses at >10(19) W/cm(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 degrees). 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. (C) 2013 AIP Publishing LLC.

Journal/Review: JOURNAL OF APPLIED PHYSICS

Volume: 114 (8)      Pages from: 083305  to: 083305

More Information: The research leading to these results has received funding from LASERLAB-EUROPE (Grant Agreement No. 284464, EU\’s Seventh Framework Programme), proposal n.SLIC001693. We acknowledge the ANR Blanc (GOSPEL, project BLAN08-1 380251), the Triangle of Physics (APPEAL), the Labex PALM, EGIDE, the Ile-de- France region (SESAME), the SAPHIR consortium (OSEO) and the regional board of Essonne (ASTRE) for their financial support. Partial support by the Czech Science Foundation (Project P205/11/1165), by the MSMT ECOP project (CZ.1.07/2.3.00/20.0087), and by MIUR (Italy) via the FIR project \”SULDIS\” are also acknowledged.
KeyWords: laser acceleration of proton beams; structured targets; beams
DOI: 10.1063/1.4819239

Citations: 19
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