Magnetic field generation during intense laser channelling in underdense plasma

Smyth, A. G.; Sarri, Gianluca; Vranić, Marija; Amano, Y.; Doria, D.; Guillaume, E.; Habara, H.; Heathcote, R.; Hicks, George; Najmudin, Z.; Nakamura, Hirotaka; Norreys, P.; Kar, S.; Silva, L. O.; Tanaka, K. A.; Vieira, Jorge; Borghesi, M.

doi:10.1063/1.4953547

Cited by 9 publications

(7 citation statements)

References 35 publications

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“…Our simulations are in agreement with the charge displacement electric and the azimuthal magnetic fields within a laser-created channel that have already been observed experimentally using proton probes [16,31]. Similarly, a strong azimuthal magnetic field is expected also during interaction with very intense lasers [46].…”

Section: Plasma Channel Generation; Electromagnetic Field Structure Wsupporting

confidence: 89%

Extremely intense laser-based electron acceleration in a plasma channel

Vranić

Fonseca

Silva

2018

Plasma Phys. Control. Fusion

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Laser pulses of extreme intensities (I > 10 22 W/cm 2 ) are about to become available in the laboratory. The prepulse of such a laser can induce a plasma expansion that generates a low-density channel in near-critical gas jets. We present a study of channel formation and subsequent direct laser acceleration of electrons within the preformed channel. Radiation reaction affects the acceleration in several ways. It first interferes with the motion of the return current on the channel walls. In addition, it reduces the radial expelling efficiency of the transverse ponderomotive force, leading to the radiative trapping of particles near the channel axis. These particles then interact with the peak laser intensity and can attain multi-GeV energies.

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Section: Plasma Channel Generation; Electromagnetic Field Structure Wsupporting

confidence: 89%

Extremely intense laser-based electron acceleration in a plasma channel

Vranić

Fonseca

Silva

2018

Plasma Phys. Control. Fusion

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“…The generation of the magnetic fields during intense laser channelling in underdense plasma has been reported in Ref. [22]. The propagation of the laser or electromagnetic pulses in plasma also leads to non-linear phenomenon resulting in the soliton formations [8,23].…”

Section: Introductionmentioning

confidence: 93%

Dispersion of the laser pulse through propagation in underdense plasmas

Choudhary,

Holkundkar

2018

Preprint

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The propagation of the laser pulses in the underdense plasma is a very crucial aspect of laser-plasma interaction process. In this work, we explored the two regimes of laser propagation in plasma, one with a 0 < 1 and other with a 0 10. For a 0 < 1 case, we used a cold relativistic fluid model, wherein apart from immobile ions no further approximations are made. The effect of the laser pulse amplitude, pulse duration, and plasma density is studied using the fluid model and compared with the expected scaling laws and also with the PIC simulations. The agreement between the fluid model and the PIC simulations are found to be excellent. Furthermore, for a 0 10 case, we used the PIC simulations alone. The delicate interplay between the conversion from the electromagnetic field energy to the longitudinal electrostatic fields results in the dispersion and so the red-shift of the pump laser pulse. We also studied the interaction of the dispersed pulse (after the propagation in underdense plasma) with the sub-wavelength two-layer composite target. The ions from the thin, low-density second layer are found to be efficiently accelerated to ∼ 70 MeV, which is not found to be the case without dispersion.

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“…A simple model is the approximation that fast processes in plasma (such as laser channelling) can generate persistent magnetic field structures while the associated electric fields decay on much shorter timescales as the plasma restores quasineutrality [16,30]. Therefore the observed proton deflections are dominated by the magnetic contribution when the probing is at sufficiently late times.…”

Section: Proton Radiographymentioning

confidence: 99%

Methods for extremely sparse-angle proton tomography

et al. 2021

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Proton radiography is a widely fielded diagnostic used to measure magnetic structures in plasma. The deflection of protons with multi-MeV kinetic energy by the magnetic fields is used to infer their path-integrated field strength. Here the use of tomographic methods is proposed for the first time to lift the degeneracy inherent in these path-integrated measurements, allowing full reconstruction of spatially resolved magnetic field structures in three dimensions. Two techniques are proposed which improve the performance of tomographic reconstruction algorithms in cases with severely limited numbers of available probe beams, as is the case in laser-plasma interaction experiments where the probes are created by short, high-power laser pulse irradiation of secondary foil targets. A new configuration allowing production of more proton beams from a single short laser pulse is also presented and proposed for use in tandem with these analytical advancements.

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Magnetic field generation during intense laser channelling in underdense plasma

Cited by 9 publications

References 35 publications

Extremely intense laser-based electron acceleration in a plasma channel

Extremely intense laser-based electron acceleration in a plasma channel

Dispersion of the laser pulse through propagation in underdense plasmas

Methods for extremely sparse-angle proton tomography

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