A5079612842- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Atomic and Molecular Physics
- Laser Design and Applications
- High-pressure geophysics and materials
- Advanced Fiber Laser Technologies
- Laser Material Processing Techniques
- Particle Accelerators and Free-Electron Lasers
- X-ray Spectroscopy and Fluorescence Analysis
- Particle accelerators and beam dynamics
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Terahertz technology and applications
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Mass Spectrometry Techniques and Applications
- Magnetic confinement fusion research
- Photonic and Optical Devices
- Pulsed Power Technology Applications
- Plasma Diagnostics and Applications
- Nuclear Physics and Applications
- Photorefractive and Nonlinear Optics
- Advanced Chemical Physics Studies
- Solid State Laser Technologies
Hebrew University of Jerusalem
2016-2025
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2016-2024
Istituto Nazionale di Fisica Nucleare
2024
Science and Technology Facilities Council
2020
Rutherford Appleton Laboratory
2020
Université de Bordeaux
2020
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2020
Centre Lasers Intenses et Applications
2020
Centre National de la Recherche Scientifique
2020
University of Lisbon
2020
A method is presented for calculating the bound-bound emission from a local thermodynamic equilibrium plasma. The total transition array of specific single-electron transition, including all possible contributing configurations, described by only small number super-transition-arrays (STA's). Exact analytic expressions are given first few moments an STA. shown to interpolate smoothly between average-atom (AA) results and detailed configuration accounting that underlies unresolved (UTA)...
Experimental demonstration of optical guiding a high intensity $(>{10}^{16}\mathrm{W}/{\mathrm{cm}}^{2})$ laser pulse in 1 cm long cylindrical plasma channel formed by slow capillary discharge is presented. Optical curved $(\mathrm{radius}\mathrm{of}\mathrm{curvature}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}10\mathrm{cm})$ also demonstrated. It shown experimentally that the mechanism insensitive to over wide range...
In this Letter we provide what is believed to be the first experimental evidence of suppression number filaments for high-intensity laser pulses propagating in air by beam astigmatism. We also show that number, pattern, and spatial stability can controlled varying angle a focusing lens makes with axial direction propagation. This new methodology useful applications involving atmospheric propagation, such as remote sensing.
We experimentally demonstrate a notably enhanced acceleration of protons to high energy by relatively modest ultrashort laser pulses and structured dynamical plasma targets. Realized special deposition snow targets on sapphire substrates using carefully planned pre-pulses, proton yield emitted in narrow solid angle with above 21MeV were detected from 5TW laser. Our simulations predict that the proposed scheme can be accelerated energies 150MeV 100TW systems.
To achieve multi-GeV electron energies in the laser wakefield accelerator (LWFA), it is necessary to propagate an intense pulse long distances a plasma without disruption. One of purposes this paper evaluate stability properties pulses propagating extended (many tens Rayleigh ranges) channels. A three-dimensional envelope equation for field derived that includes nonparaxial effects such as group velocity dispersion, well and relativistic nonlinearities. It shown broad beam, short limit...
The development of compact accelerator facilities providing high-brightness beams is one the most challenging tasks in field next-generation and cost affordable particle accelerators, to be used many fields for industrial, medical, research applications. ability shape beam longitudinal phase space, particular, plays a key role achieving high-peak brightness. Here we present new approach that allows us tune space by means plasma wakefields. electron passing through drives large wakefields are...
Plasma-based technology promises a tremendous reduction in size of accelerators used for research, medical, and industrial applications, making it possible to develop tabletop machines accessible broader scientific community. By overcoming current limits conventional pushing particles larger energies, the availability strong tunable focusing optics is mandatory also because plasma-accelerated beams usually have large angular divergences. In this regard, active-plasma lenses represent compact...
The active plasma lens represents a compact and affordable tool with radially symmetric focusing field gradients up to several kT/m. In order be used as device, its effects on the particle beam distribution must well characterized. Here, we present experimental results obtained by an high-brightness electron means of 3 cm-long discharge-capillary pre-filled Hydrogen gas. We achieved minimum spot sizes 24 μm (rms) showing that, during lensing, emittance increases due nonlinearities in field....
Optical guiding of high-intensity laser pulses in a long plasma channel formed by slow capillary discharge is proposed. The obtained parameters are studied, and the methods which they can be controlled described. Initial results demonstrating one transverse dimension such presented.
The interaction of intense, femtosecond laser pulses with a dielectric medium is examined using numerical simulation. simulation uses the one-dimensional electromagnetic wave equation to model pulse propagation. In addition, it includes multiphoton ionization, electron attachment, Ohmic heating free electrons, and temperature-dependent collisional ionization. Laser considered in this study are characterized by peak intensities...
We show numerically for continuous-wave beams and experimentally femtosecond pulses propagating in air, that the collapse distance of intense laser a bulk Kerr medium scales as 1/P;1/2 input powers P are moderately above critical power self focusing, but at higher 1/P.
The x-ray spectra in the range 5–8 Å emitted from laser-produced plasmas of Hf, Ta, W, and Re were observed. Lines belonging to 3d10 − 3d9 4f 4p transitions, as well 3p63d10 3p53d10 4s 4d transitions Ni-like isoelectronic sequence, identified. In addition, interpretation some previously measured lines same sequence revised.
A substantially extended lifetime of a high-density plasma channel generated in the wake an intense femtosecond pulse propagating air is experimentally demonstrated. Free electron density above 1015 cm−3 formed filament measured to be sustained for more than 30 ns. This prolongation one order magnitude achieved by properly timed irradiation with relatively low-intensity nanosecond laser pulse, comparison without such irradiation. The experimental results are good agreement our theoretical...
The breakthrough provided by plasma-based accelerators enabled unprecedented accelerating fields boosting electron beams to gigaelectronvolt energies within a few centimeters [1-4]. This, in turn, allows the realization of ultracompact light sources based on free-electron lasers (FELs) [5], as demonstrated two pioneering experiments that reported observation self-amplified spontaneous emission (SASE) driven plasma-accelerated [6,7]. However, lack stability and reproducibility due intrinsic...
We describe the generation of plasma filaments for application in plasma-based particle accelerators. The complete characterization a filament generated by low-energy self-guided femtosecond laser pulse is studied experimentally and theoretically low-pressure nitrogen gas environment. For this purpose, we adopted spectroscopic methodology to measure density electron temperature. In addition this, also employed side-imaging technique retrieve column sizes (length diameter). measurements show...
Transmission efficiencies in excess of 75% were obtained the optical guiding subpicosecond, terawatt laser pulses a 2-cm-long capillary discharge plasma channel at Naval Research Laboratory. The guided beam size exit was measured using far field imaging and Thomson scattering techniques. intensity >1 x 10(17) W/cm(2) diameter 35 microm for propagation length 22 Rayleigh ranges. There is evidence that extends beyond ends affects structure transmitted pulse.
A study was undertaken to find the optimal conditions for generating x rays using a high-power frequency-doubled Nd laser pulse x-ray backlighting application. More than 30 shots on Lawrence Livermore National Laboratory JANUS Research Laser system have been studied. The following specific questions are addressed: (a) X-ray yield dependence parameters: (i) temporal width and (ii) focusing conditions. (b) source size versus target dimensions by tungsten wire with various diameters. (c)...
We present small-signal gain coefficients for soft x-ray transitions in nickel-like gadolinium. The gains are predicted by a steady-state collisional-radiative model containing 181 detailed levels, including n=5 states. All possible electron collisional among these levels calculated the distorted-wave approximation. Our calculations display features that may help to explain discrepancies between design predictions and recently observed europium plasma. Also, we identify first time n=3...
We report on the first generation of 5.5-7.5 MeV protons by a moderate-intensity short-pulse laser (∼5×10(17) W/cm(2), 40 fsec) interacting with frozen H(2)O nanometer-size structure droplets (snow nanowires) deposited sapphire substrate. In this setup, intensity is locally enhanced snow nanowire, leading to high spatial gradients. Accordingly, nanoplasma subject ponderomotive potential, and confined charge separation obtained. Electrostatic fields extremely intensities are produced over...
Abstract Highly energetic electrons are generated at the early phases of interaction short-pulse high-intensity lasers with solid targets. These escaping particles identified as essential core picosecond-scale phenomena such laser-based acceleration, surface manipulation, generation intense magnetic fields and electromagnetic pulses. Increasing number facilitate late time processes in all cases. Up to now only indirect evidences these important forerunners have been recorded, thus no...
To achieve multi-GeV electron energies in the laser wakefield accelerator (LWFA) it is necessary to propagate an intense pulse long distances plasma without disruption. A 3D envelope equation for a tapered channel derived, which includes wakefields and relativistic nonparaxial effects, such as finite length group velocity dispersion. It shown that of approximately GeV plasma-channel LWFA can be achieved by using short pulses where forward Raman modulation nonlinearities tend cancel. Further...