Laser-driven high-energy proton beam with homogeneous spatial profile from a nanosphere target

0455724 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
Margarone, Daniele - Kim, I. J. - Pšikal, Jan - Kaufman, Jan - Mocek, Tomáš - Choi, I.W. - Štolcová, Lucie - Proska, J. - Choukourov, A. - Melnichuk, I. - Klimo, Ondřej - Limpouch, Jiří - Sung, J.H. - Lee, S.K. - Korn, Georg - Jeong, T.M.
Laser-driven high-energy proton beam with homogeneous spatial profile from a nanosphere target.
Physical Review Special Topics-Accelerators and Beams. Roč. 18, č. 7 (2015), "071304-1"-"071304-7". ISSN 1098-4402
Grant CEP: GA MŠMT(CZ) LD14089; GA ČR(CZ) GA15-02964S; GA MŠMT ED1.1.00/02.0061; GA MŠMT ED3.1.00/10.0210; GA MŠMT EE2.3.20.0279
GRANT EU: European Commission(XE) CZ.1.05/3.1.00/10.0210
Grant ostatní: AVČR(CZ) M100101210; ELI Beamlines(XE) CZ.1.05/1.1.00/02.0061; LaserZdroj (OP VK 3)(XE) CZ.1.07/2.3.00/20.0279
Institucionální podpora: RVO:68378271
Klíčová slova: petawatt-laser * acceleration * spectroscopy
Kód oboru RIV: BH - Optika, masery a lasery
Impakt faktor: 1.500, rok: 2015

A high-energy, high-yield proton beam with a good homogeneous profile has been generated from a nanosphere target irradiated by a short (30-fs), intense (7 x 10(20) W/cm(2)) laser pulse. A maximum proton energy of 30 MeV has been observed with a high proton number of 7 x 10(10) in the energy range 5-30 MeV. A homogeneous spatial profile with a uniformity (standard deviation from an average value within 85% beam area) of 15% is observed with the nanosphere dielectric target. Particle-in-cell simulations show the enhancement of proton cutoff energy and proton number with the nanosphere target and reveal that the homogeneous beam profile is related with a broadened angular distribution of hot electrons, which is initiated by the nanosphere structure. The homogeneous spatial properties obtained with the nanosphere target will be advantageous in developing laser-driven proton sources for practical applications in which high-quality beams are required.
Trvalý link: http://hdl.handle.net/11104/0256348