Electron injection into laser wakefields by colliding circularly-polarized laser pulses

AbstractElectron injection into a laser wakefield by the colliding of two circularly polarized laser pulses is analyzed by the Hamiltonian approach and particle-in-cell simulations. If the pump pulse driving the laser wakefield is right-circularly-polarized, electron injection is found only when the counter-propagating injection pulse is left-circularly-polarized and vice versa. This holds when the injection pulse is at low intensity and has a frequency near the pump pulse frequency ω0. For a moderately intense injection pulse, even if the two pulses have the same polarization, electron injection is found but with less efficiency. It is also found that the injection pulse with the frequency within [0.5ω0,3ω0] can still create electron injection efficiently provided it has the opposite polarization with the pump pulse.

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Scissor-cross ionization injection in laser wakefield accelerators

Plasma Physics and Controlled Fusion ◽

10.1088/1361-6587/ac4853 ◽

2022 ◽

Author(s):

Jia Wang ◽

Ming Zeng ◽

Xiaoning Wang ◽

Dazhang Li ◽

Jie Gao

Keyword(s):

Three Dimensional ◽

Laser Pulses ◽

Acute Angle ◽

Energy Spread ◽

Particle In Cell ◽

High Injection ◽

Dope Ratio ◽

Laser Wakefield ◽

Driving Pulse ◽

Wakefield Accelerator

Abstract We propose to use a frequency doubled pulse colliding with the driving pulse at an acute angle to trigger ionization injection in a laser wakefield accelerator. This scheme effectively reduces the duration that injection occurs, thus high injection quality is obtained. Three-dimensional particle-in-cell simulations show that electron beams with energy of ~500 MeV, charge of ~40 pC, energy spread of ~1% and normalized emittance of a few millimeter milliradian can be produced by ~100 TW laser pulses. By adjusting the angle between the two pulses, the intensity of the trigger pulse and the gas dope ratio, the charge and energy spread of the electron beam can be controlled.

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High quality GeV proton beams from a density-modulated foil target

Laser and Particle Beams ◽

10.1017/s0263034609990334 ◽

2009 ◽

Vol 27 (4) ◽

pp. 611-617 ◽

Cited By ~ 22

Author(s):

T.P. Yu ◽

M. Chen ◽

A. Pukhov

Keyword(s):

Laser Intensity ◽

Laser Pulses ◽

Two Dimensional ◽

High Quality ◽

Proton Acceleration ◽

Circularly Polarized ◽

Particle In Cell ◽

Efficient Energy ◽

Peak Energy ◽

Foil Target

AbstractWe study proton acceleration from a foil target with a transversely varying density using multi-dimensional Particle-in-Cell (PIC) simulations. In order to reduce electron heating and deformation of the target, circularly polarized Gaussian laser pulses at intensities on the order of 1022 Wcm−2 are used. It is shown that when the target density distribution fits that of the laser intensity profile, protons accelerated from the center part of the target have quasi-monoenergetic spectra and are well collimated. In our two-dimensional PIC simulations, the final peak energy can be up to 1.4 GeV with the full-width of half maximum divergence cone of less than 4°. We observe highly efficient energy conversion from the laser to the protons in the simulations.

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Plasma rotation with circularly polarized laser pulse

Laser and Particle Beams ◽

10.1017/s0263034615000853 ◽

2015 ◽

Vol 34 (1) ◽

pp. 31-42 ◽

Cited By ~ 8

Author(s):

Z. Lécz ◽

A. Andreev ◽

A. Seryi

Keyword(s):

Laser Pulses ◽

Laser Wavelength ◽

Ion Dynamics ◽

Circularly Polarized ◽

Particle In Cell ◽

Solid Density ◽

Maximum Value ◽

Energy And Momentum ◽

Initial Target ◽

Efficient Transfer

AbstractThe efficient transfer of angular orbital momentum from circularly polarized laser pulses into ions of solid density targets is investigated with different geometries using particle-in-cell simulations. The detailed electron and ion dynamics presented focus upon the energy and momentum conversion efficiency. It is found that the momentum transfer is more efficient for spiral targets and the maximum value is obtained when the spiral step is equal to twice the laser wavelength. This study reveals that the angular momentum distribution of ions strongly depends up on the initial target shape and density.

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Generation and collective interaction of giant magnetic dipoles in laser cluster plasma

Scientific Reports ◽

10.1038/s41598-021-95465-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

A. Andreev ◽

K. Platonov ◽

Zs. Lécz ◽

N. Hafz

Keyword(s):

Magnetic Interaction ◽

Laser Pulses ◽

Lagrangian Formalism ◽

Magnetic Dipoles ◽

Circularly Polarized ◽

Nanometer Size ◽

Particle In Cell ◽

Analytical Results ◽

Collective Interaction ◽

Dipole Oscillation

AbstractInteraction of circularly polarized laser pulses with spherical nano-droplets generates nanometer-size magnets with lifetime on the order of hundreds of femtoseconds. Such magnetic dipoles are close enough in a cluster target and magnetic interaction takes place. We investigate such system of several magnetic dipoles and describe their rotation in the framework of Lagrangian formalism. The semi-analytical results are compared to particle-in-cell simulations, which confirm the theoretically obtained terrahertz frequency of the dipole oscillation.

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ION ACCELERATION USING CIRCULARLY POLARIZED PULSES: PHYSICS AND POSSIBLE APPLICATIONS

International Journal of Modern Physics B ◽

10.1142/s0217979207042380 ◽

2007 ◽

Vol 21 (03n04) ◽

pp. 579-589 ◽

Cited By ~ 1

Author(s):

ANDREA MACCHI ◽

FULVIO CORNOLTI

Keyword(s):

Scaling Laws ◽

Laser Pulses ◽

High Density ◽

Ion Acceleration ◽

Rear Side ◽

Fast Electrons ◽

Circularly Polarized ◽

Laser Plasma Interaction ◽

Particle In Cell ◽

Fusion Neutrons

The acceleration of ions in the interaction of ultrashort, high intensity, circularly polarized laser pulses with overdense plasmas has been theoretically investigated. By using particle-in-cell (PIC) simulations it is found that high-density, short duration ion bunches moving into the plasma are promptly generated at the laser-plasma interaction surface. This regime is qualitatively different from ion acceleration regimes driven by fast electrons such as sheath acceleration at the rear side of the target. A simple analytical model accounts for the numerical observations and provides scaling laws for the ion bunch velocity and generation time as a function of pulse intensity and plasma density. The ion bunches have moderate energies (100 keV-1 MeV) but very high density and low beam divergence, and might be of interest for problems of ultrafast compression, acceleration or heating of high–density matter. In particular, we have studied their application to the development of compact sources of fusion neutrons. We analyzed two target schemes showing that intense neutron bursts with femtosecond duration are produced.

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High-order harmonic generation of benzene molecules irradiated by circularly polarized laser pulses

Chemical Physics ◽

10.1016/j.chemphys.2021.111147 ◽

2021 ◽

pp. 111147

Author(s):

Shushan Zhou ◽

Qingyi Li ◽

Fuming Guo ◽

Jun Wang ◽

Jigen Chen ◽

...

Keyword(s):

Harmonic Generation ◽

Laser Pulses ◽

High Order ◽

High Order Harmonic Generation ◽

Circularly Polarized ◽

High Order Harmonic

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ENERGETIC PROTON ACCELERATION BY ULTRAINTENSE LASER PULSES IN INHOMOGENEOUS PLASMA TARGETS

International Journal of Modern Physics B ◽

10.1142/s021797920704246x ◽

2007 ◽

Vol 21 (03n04) ◽

pp. 642-646 ◽

Cited By ~ 1

Author(s):

A. ABUDUREXITI ◽

Y. MIKADO ◽

T. OKADA

Keyword(s):

Laser Pulse ◽

Inhomogeneous Plasma ◽

Laser Pulses ◽

Proton Acceleration ◽

Particle In Cell ◽

Target Plasma ◽

Plasma Target ◽

Experimental Process ◽

Foil Target ◽

Proton Bunch

Particle-in-Cell (PIC) simulations of fast particles produced by a short laser pulse with duration of 40 fs and an intensity of 1020W/cm2 interacting with a foil target are performed. The experimental process is numerically simulated by considering a triangular concave target illuminated by an ultraintense laser. We have demonstrated increased acceleration and higher proton energies for triangular concave targets. We also determined the optimum target plasma conditions for maximum proton acceleration. The results indicated that a change in the plasma target shape directly affects the degree of contraction accelerated proton bunch.

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