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

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...

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Bibliographic Details
Published in:Physics of plasmas 2023-02, Vol.30 (2)
Main Authors: Mandal, T., Arora, V., Moorti, A., Uphadhyay, A., Chakera, J. A
Format: Article
Language:English
Subjects:
Electron beams
Electron energy
Foils
Plasma physics
Polarization
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Summary: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.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0109270