Directed fast electron beams in ultraintense picosecond laser irradiated solid targets

Ge, Xuan; Lin, Xiaona; Yuan, Xiaohui; Carroll, D. C.; Gray, R. J.; Yu, Tong-Pu; Tresca, O.; Chen, Min; Liu, F.; Zhuo, H. B.; Zielbauer, B.; Zhao, Li; Neely, D.; Sheng, Zheng-Ming; Li, Y. T.; McKenna, P.

doi:10.1063/1.4930074

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…During this campaign the laser was defocused by up to 400 µm, decreasing the incident intensity onto the target from 4x10 20 -4x10 17 W/cm 2 . Previous studies have employed wraparound diagnostics to examine the rear surface escaping EPJ Web of Conferences 167, 02001 (2018) https://doi.org/10.1051/epjconf/201816702001 PPLA 2017 electrons [9,10] whilst simultaneously investigating the electron flux emitted the front surface [8]. The experimental results from this campaign are accompanied by two dimensional particle-in-cell (PIC) simulations, investigating the influence of a front surface pre-plasma on a defocused pulse.…”

Section: Introductionmentioning

confidence: 99%

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Rusby

Gray

Butler

et al. 2018

EPJ Web of Conferences

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Abstract. The interaction of a high-intensity laser with a solid target produces an energetic distribution of electrons that pass into the target. These electrons reach the rear surface of the target creating strong electric potentials that act to restrict the further escape of additional electrons. The measurement of the angle, flux and spectra of the electrons that do escape gives insights to the initial interaction. Here, the escaping electrons have been measured using a differentially filtered image plate stack, from interactions with intensities from mid 10 20 -10 17 W/cm 2 , where the intensity has been reduced by defocussing to increase the size of the focal spot. An increase in electron flux is initially observed as the intensity is reduced from 4x10 20 to 6x10 18 W/cm 2 . The temperature of the electron distribution is also measured and found to be relatively constant. 2D particle-in-cell modelling is used to demonstrate the importance of pre-plasma conditions in understanding these observations.

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Section: Introductionmentioning

confidence: 99%

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Rusby

Gray

Butler

et al. 2018

EPJ Web of Conferences

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Experimental study of fast electron generation from intense laser irradiated mylar foil with thin metal coating on front or rear surfaces

et al. 2019

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We report angular and spectral distribution of fast electrons in the interaction of a high intensity laser pulse (30 fs, I∼1019 W/cm2) with uncoated transparent mylar foil (thickness: 8 μm). The effect of thin Al coating (50 nm) on either the front or rear surface of the mylar foil on fast electron generation was also investigated. An electron flux enhancement of ∼1.8× (from ∼45 pC to ∼80 pC) and an increase in the maximum electron energy from ∼ 400 keV to ∼ 800 keV were observed in the case of front coated foil compared to the uncoated one. In the case of rear coated foil, an enhancement of ∼1.4× in the electron flux with no change in maximum electron energy was observed compared to the uncoated foil. The observations are understood in terms of possible different preplasma conditions for various target configurations used, which is also supported by 1D hydrodynamic simulation carried out for the present experimental conditions. The observed enhancement in electron flux and temperature is also supported by 2D Particle in Cell (PIC) simulation.

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Addressing key aspects of J × B driven MeV fast electron generation in ultra-short ultra-intense laser foil interaction

et al. 2023

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Applicability of J × B mechanism of MeV fast electron generation is clearly demonstrated through observation of directed electron beam along laser propagation direction (simultaneous emission also along laser polarization/transverse directions) in the interaction of ∼25 fs laser pulse with thin foil target at an intensity of 1–7 × 1019 W/cm2. Fast electron temperature is found to be lower (higher) than ponderomotive for shorter (longer) preplasma scale lengths. Role of pre-acceleration of electrons in the rising part of the laser pulse is suggested for observed efficient J × B acceleration for p-polarization case. 2D particle in cell simulation also supports the above-mentioned observations.

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Directed fast electron beams in ultraintense picosecond laser irradiated solid targets

Cited by 5 publications

References 21 publications

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Escaping Electrons from Intense Laser-Solid Interactions as a Function of Laser Spot Size

Experimental study of fast electron generation from intense laser irradiated mylar foil with thin metal coating on front or rear surfaces

Addressing key aspects of J × B driven MeV fast electron generation in ultra-short ultra-intense laser foil interaction

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