Generation mechanism of 100 MG magnetic fields in the interaction of ultra-intense laser pulse with nanostructured target

Experimental and simulation data [Moreau et al. , Plasma Phys. Control. Fusion 62 , 014013 (2019); Kaymak et al. , Phys. Rev. Lett. 117 , 035004 (2016)] indicate that self-generated magnetic fields play an important role in enhancing the flux and energy of relativistic electrons accelerated by ultra...

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Bibliographic Details
Published in:High power laser science and engineering 2020, Vol.8, Article e16
Main Authors: Tian, J. M., Cai, H. B., Zhang, W. S., Zhang, E. H., Du, B., Zhu, S. P.
Format: Article
Language:English
Subjects:
Arrays
Computational fluid dynamics
Computer simulation
Electron energy
Electrons
Energy
Flow velocity
Hot electrons
Laser arrays
Lasers
Magnetic fields
Magnetohydrodynamics
Mathematical models
Nanostructure
Nanowires
Plasma
Relativistic effects
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Summary:Experimental and simulation data [Moreau et al. , Plasma Phys. Control. Fusion 62 , 014013 (2019); Kaymak et al. , Phys. Rev. Lett. 117 , 035004 (2016)] indicate that self-generated magnetic fields play an important role in enhancing the flux and energy of relativistic electrons accelerated by ultra-intense laser pulse irradiation with nanostructured arrays. A fully relativistic analytical model for the generation of the magnetic field based on electron magneto-hydrodynamic description is presented here. The analytical model shows that this self-generated magnetic field originates in the nonparallel density gradient and fast electron current at the interfaces of a nanolayered target. A general formula for the self-generated magnetic field is found, which closely agrees with the simulation scaling over the relevant intensity range. The result is beneficial to the experimental designs for the interaction of the laser pulse with the nanostructured arrays to improve laser-to-electron energy coupling and the quality of forward hot electrons.
ISSN:2095-4719
2052-3289
DOI:10.1017/hpl.2020.16