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Laser-pulse shape effects on magnetic field generation in underdense plasmas

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Abstract

Laser pulse shape effect has been considered to estimate the self-generated magnetic field in laser-plasma interaction. A ponderomotive force based physical mechanism has been proposed to investigate the self-generated magnetic field for different spatial profiles of the laser pulse in inhomogeneous plasmas. The spatially inhomogeneous electric field of a laser pulse imparts a stronger ponderomotive force on plasma electrons. Thus, the stronger ponderomotive force associated with the asymmetric laser pulse generates a stronger magnetic field in comparison to the case of a symmetric laser pulse. Scaling laws for magnetic field strength with the laser and plasma parameters for different shape of the pulse have been suggested. Present study might be helpful to understand the plasma dynamics relevant to the particle trapping and injection in laser-plasma accelerators.

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Acknowledgements

K. Gopal thanks to Council of Science and Industrial Research (CSIR) for the financial support to carry out his thesis work. This work is financially supported by the DST-DAAD joint program 2014.

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Correspondence to Devki Nandan Gupta.

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Gopal, K., Raja, M.A., Gupta, D.N. et al. Laser-pulse shape effects on magnetic field generation in underdense plasmas. Indian J Phys 92, 919–925 (2018). https://doi.org/10.1007/s12648-018-1167-7

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Keywords

  • Self-generated magnetic field
  • Ponderomotive force
  • Laser-plasma interaction

PACS No.

  • 52.38.-r