Energetic electrons and protons generated from the interaction of ultrashort laser pulses with microdroplet plasmas

Jun Zheng; Zheng-Ming Sheng; Xiao-Yu Peng; Jie Zhang
November 2005
Physics of Plasmas;Nov2005, Vol. 12 Issue 11, p113105
Academic Journal
Generation of fast electrons and protons from ultrashort laser interactions with microdroplet plasmas has been simulated by two-dimensional particle-in-cell simulations. At weakly relativistic laser intensities, two jets of hot electrons are found to emit symmetrically in the backward direction when there is preplasma formed around the droplet surface. These electron jets are associated with resonance absorption around the target surface with a spherical geometry. At relativistic laser intensities, electron bunches generated by the laser ponderomotive force separated by a laser period are superimposed to the resonant hot-electron jets. Relevant with the hot-electron emission, energetic protons can be separated into two groups: one with higher energies mainly emits in certain angles within the laser polarization plane and another with lower energies emits nearly isotropically in all directions. The protons in the first group are accelerated by the electrostatic fields induced by the hot-electron jets due to the resonance absorption, while those in the second group are generated by the ambipolar expansion of the microdroplet plasma.


Related Articles

  • Vacuum heating versus skin layer absorption of intense femtosecond laser pulses. Bauer, D.; Mulser, P. // Physics of Plasmas;Feb2007, Vol. 14 Issue 2, p023501 

    The crossing of the narrow skin layer in solid targets by electrons in a time shorter than a laser cycle represents one of the numerous collisionless absorption mechanisms of intense laser-matter interaction. This kinetic effect is studied at normal and oblique laser beam incidence and particle...

  • Enhanced production of fast multi-charged ions from plasmas formed at cleaned surface by femtosecond laser pulse. Gordienko, V. M.; Lachko, I. M.; Rusanov, A. A.; Savel'ev, A. B.; Uryupina, D. S.; Volkov, R. V. // Applied Physics B: Lasers & Optics;May2005, Vol. 80 Issue 6, p733 

    We present atomic, energy, and charge spectra of ions accelerated at thefrontsurface of a silicon target irradiated by a high-contrast femtosecond laser pulse with an intensity of 3×1016 W/cm2, which is delayed with respect to a cleaning nanosecond laser pulse of 3-J/cm2 energy density. A...

  • Dynamics Of A Laser-Induced Plume Self-Similar Expansion. Bennaceur-Doumaz, D.; Djebli, M. // AIP Conference Proceedings;9/23/2008, Vol. 1047 Issue 1, p144 

    The dynamics of a laser ablation plume during the first stage of its expansion, just after the termination of the laser pulse is modeled. First, we suppose the laser fluence range low enough to consider a neutral vapor. The expansion of the evaporated material is described by one-component fluid...

  • Wakefield Generation as the Mechanism behind Spectral Shift of a Short Laser Pulse. Andreev, N. E.; Chegotov, M. V. // Journal of Experimental & Theoretical Physics;Jul2005, Vol. 101 Issue 1, p56 

    An equation describing the dynamics of plasma wave generation by a short intense laser pulse is analyzed to find a relation between the difference in mean-square pulse frequency before and after laser–matter interaction and the electric field amplitude in the wakefield plasma wave...

  • Laser pulse transmission through the water breakdown plasma in laser shock peening. Benxin Wu; Shin, Yung C. // Applied Physics Letters;1/23/2006, Vol. 88 Issue 4, p041116 

    Laser shock peening (LSP) under a water confinement regime can produce plasma pressures on the target surface four times higher and 2–3 times longer than that under direct regime configurations. However, when the laser power density is above some threshold, a breakdown plasma occurs in...

  • GeV energy gain in a channel guided laser wakefield accelerator. Sprangle, P.; Hafizi, B.; Pen˜ano, J. R.; Hubbard, R. F.; Ting, A.; Zigler, A.; Antonsen, T. M. // AIP Conference Proceedings;2001, Vol. 569 Issue 1, p242 

    A 3-D envelope equation for a laser pulse in a tapered plasma channel is derived, which includes wakefields, relativistic and non-paraxial effects such as finite pulse length and group velocity dispersion. It is shown that electron energies of ∼ GeV in a channel-guided LWFA can be achieved...

  • Laser ion acceleration by a near-critical density target. Yogo, A.; Daido, H.; Bulanov, S. V.; Esirkepov, T. Zh.; Nemoto, K.; Oishi, Y.; Nayuki, T.; Fujii, T.; Ogura, K.; Orimo, S.; Sagisaka, A.; Ma, J.-L.; Mori, M.; Nishiuchi, M.; Pirozhkov, A. S.; Nakamura, S.; Noda, A.; Nagatomo, H. // AIP Conference Proceedings;7/15/2008, Vol. 1024 Issue 1, p157 

    Protons having energies up to 3.8 MeV are experimentally generated by the p-polarized, 45 fs, ∼1019 W/cm2 laser pulse interacting with a near-critical plasma cloud produced by the irradiation of the amplified spontaneous emission (ASE) pedestal at an intensity of ∼1013 W/cm2 onto a...

  • Laser proton acceleration in a water spray target. Ter-Avetisyan, S.; Schnürer, M.; Nickles, P. V.; Smirnov, M. B.; Sandner, W.; Andreev, A.; Platonov, K.; Psikal, J.; Tikhonchuk, V. // Physics of Plasmas;Aug2008, Vol. 15 Issue 8, p083106 

    Studies of interaction of a cloud of submicrometer water droplets with ultrashort (40 fs) and intense (∼2×1019 W/cm2) laser pulses demonstrate an efficient acceleration of protons and oxygen ions. Due to a high ratio of the volume to the enveloping surface of a single droplet and a...

  • Electron acceleration and electron-positron pair production by laser in tunnel ionized inhomogeneous plasma. Gupta, D. N.; Suk, H.; Ryu, C. M. // Physics of Plasmas;Sep2005, Vol. 12 Issue 9, p093110 

    A high intensity laser short pulse causes rapid tunnel ionization of an inhomogeneous gas. The tunnel ionization of the gas causes a defocusing of the laser pulse. The electron experiences an unequal ponderomotive force due to the trailing and rising part of the laser pulse, hence, gains net...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics