Field ionization model implemented in Particle In Cell code and applied to laser-accelerated carbon ions

Nuter, R.; Grémillet, L.; Lefebvre, E.; Lévy, Anna; Ceccotti, T.; Martin, Philip

doi:10.1063/1.3559494

Cited by 60 publications

(56 citation statements)

References 28 publications

(18 reference statements)

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“…A specific version of CALDER has been used in this case, including a "ionization module." 32 The ionization is calculated considering ADK 33 ionization model, neglecting the collisional ionization. The laser pulse is Gaussian with pulse duration of 65 fs.…”

Section: Discussion and Numerical Simulationsmentioning

confidence: 99%

Space- and time-resolved observation of extreme laser frequency upshifting during ultrafast-ionization

et al. 2013

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A 65-fs, 800-nm, 2-TW laser pulse propagating through a nitrogen gas jet has been experimentally studied by 90 Thomson scattering. Time-integrated spectra of scattered light show unprecedented broadening towards the blue which exceeds 300 nm. Images of the scattering region provide for the first time a space- and time-resolved description of the process leading quite regularly to such a large upshift. The mean shifting rate was as high as dk/dt3A ̊/fs, never observed before. Interferometry shows that it occurs after partial laser defocusing. Numerical simulations prove that such an upshift is consistent with a laser-gas late interaction, when laser intensity has decreased well below relativistic values (a0 1) and ionization process involves most of the laser pulse. This kind of interaction makes spectral tuning of ultrashort intense laser pulses possible in a large spectral range. VC 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4818602

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Section: Discussion and Numerical Simulationsmentioning

confidence: 99%

Space- and time-resolved observation of extreme laser frequency upshifting during ultrafast-ionization

et al. 2013

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“…By means of this simplified approach, the scaling of the THz conversion efficiency with various pulse parameters is discussed. All our results are benchmarked by rigorous particle-in-cell (PIC) simulations using the codes OCEAN [28] and CALDER [29], and we report excellent agreement.…”

Section: Introductionmentioning

confidence: 99%

“…The ionization rate W (Z) in quasi-static approximation creating ions with charge Z is given in [39,40]. The same approach is used in the PIC codes OCEAN [28] and CALDER [29]. The ion densities n (Z) ion of the ions with charge Z are of order 0 .…”

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confidence: 99%

Theory of terahertz emission from femtosecond-laser-induced microplasmas

et al. 2016

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We present a theoretical investigation of terahertz (THz) generation in laser-induced gas plasmas. The work is strongly motivated by recent experimental results on micro-plasmas, but our general findings are not limited to such a configuration. The electrons and ions are created by tunnelionization of neutral atoms, and the resulting plasma is heated by collisions. Electrons are driven by electromagnetic, convective and diffusive sources and produce a macroscopic current which is responsible for THz emission. The model naturally includes both, ionization current and transitionCherenkov mechanisms for THz emission, which are usually investigated separately in the literature. The latter mechanism is shown to dominate for single-color multi-cycle lasers pulses, where the observed THz radiation originates from longitudinal electron currents. However, we find that the often discussed oscillations at the plasma frequency do not contribute to the THz emission spectrum. In order to predict the scaling of the conversion efficiency with pulse energy and focusing conditions, we propose a simplified description that is in excellent agreement with rigorous particle-in-cell simulations.

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“…Apart from more experimental data at different laser parameters, theoretical studies on this complex topic are indispensable. A novel numerical modeling of field ionization in particlein-cell codes to analyze the cutoff energies of the laseraccelerated carbon ions was developed by the group of Nuter [31]. With this work numerical investigations of different carbon ion charge states are available while the usual simulation codes for TNSA consider only the accelerated protons.…”

Section: Discussionmentioning

confidence: 99%

Influence of fs-laser desorption on target normal sheath accelerated ions

Hoffmeister

Bellei

Harres

et al. 2013

Phys. Rev. ST Accel. Beams

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We report on the effects of fs-laser desorption on the ion acceleration induced by the target normal sheath acceleration (TNSA) mechanism. The experiment was performed at the Lawrence Livermore National Laboratory (LLNL) using the 100 TW Callisto laser of the Jupiter Laser Facility (JLF). Thin metal foils (Au, Cu, and Al) with thicknesses ranging from 10 to 20 m were irradiated by a variable number of low intensity ($ 10 12 W=cm 2 ) laser pulses, the last one arriving 100 ms before the main pulse. With these short pulses water vapor and hydrocarbon contaminations could stepwise be removed from the target surface. Substantial modifications of the TNSA-ion energy spectra were observed such as diminished proton energy and intensity, the absence of low-charged ion states, increased particle numbers for C 4þ and O 6þ ions in the higher energetic part of their particle spectra as well as the acceleration of target ions. The controlled application of fs-laser desorption on the laser-ion acceleration thus strongly influences the ion spectra and offers the possibility of selecting a targeted range of ion species for the acceleration to higher energies due to the systematic removal of contamination layers.

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Field ionization model implemented in Particle In Cell code and applied to laser-accelerated carbon ions

Cited by 60 publications

References 28 publications

Space- and time-resolved observation of extreme laser frequency upshifting during ultrafast-ionization

Space- and time-resolved observation of extreme laser frequency upshifting during ultrafast-ionization

Theory of terahertz emission from femtosecond-laser-induced microplasmas

Influence of fs-laser desorption on target normal sheath accelerated ions

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