Dynamics of electric fields driving the laser acceleration of multi-MeV protons

被引:271
作者
Romagnani, L [1 ]
Fuchs, J
Borghesi, M
Antici, P
Audebert, P
Ceccherini, F
Cowan, T
Grismayer, T
Kar, S
Macchi, A
Mora, P
Pretzler, G
Schiavi, A
Toncian, T
Willi, O
机构
[1] Queens Univ Belfast, Sch Math & Phys, Belfast BT7 1NN, Antrim, North Ireland
[2] Univ Paris 06, CNRS, CEA, LULI,UMR 7605,Ecole Polytech, F-91128 Palaiseau, France
[3] Univ Nevada, Dept Phys, Reno, NV 89557 USA
[4] Univ Roma 1 La Sapienza, Dipartimento Energet, Rome, Italy
[5] Univ Pisa, Dipartimento Fis E Fermi, INFM, Pisa, Italy
[6] CNRS, Ecole Polytech, UMR 7644, Ctr Phys Theor, F-91128 Palaiseau, France
[7] Univ Dusseldorf, Inst Laser & Plasmaphys, Dusseldorf, Germany
关键词
D O I
10.1103/PhysRevLett.95.195001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The acceleration of multi-MeV protons from the rear surface of thin solid foils irradiated by an intense (similar to 10(18) W/cm(2)) and short (similar to 1.5 ps) laser pulse has been investigated using transverse proton probing. The structure of the electric field driving the expansion of the proton beam has been resolved with high spatial and temporal resolution. The main features of the experimental observations, namely, an initial intense sheath field and a late time field peaking at the beam front, are consistent with the results from particle-in-cell and fluid simulations of thin plasma expansion into a vacuum.
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页数:4
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