Collimated fast electron beam generation in critical density plasma
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Significantly collimated fast electron beam with a divergence angle 10° (FWHM) is observed when an ultra-intense laser pulse (I = 1014 W/cm2, 300 fs) irradiates a uniform critical density plasma. The uniform plasma is created through the ionization of an ultra-low density (5 mg/c.c.) plastic foam by X-ray burst from the interaction of intense laser (I = 1014 W/cm2, 600 ps) with a thin Cu foil. 2D Particle-In-Cell (PIC) simulation well reproduces the collimated electron beam with a strong magnetic field in the region of the laser pulse propagation. To understand the physical mechanism of the collimation, we calculate energetic electron motion in the magnetic field obtained from the 2D PIC simulation. As the results, the strong magnetic field (300 MG) collimates electrons with energy over a few MeV. This collimation mechanism may attract attention in many applications such as electron acceleration, electron microscope and fast ignition of laser fusion.
Iwawaki , T , Habara , H , Baton , S , Morita , K , Fuchs , J , Chen , S , Nakatsutsumi , M , Rousseaux , C , Filippi , F , Nazarov , W & Tanaka , K A 2014 , ' Collimated fast electron beam generation in critical density plasma ' Physics of Plasmas , vol 21 , no. 11 . DOI: 10.1063/1.4900868
Physics of Plasmas
Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in: Iwawaki, T., Habara, H., Baton, S., Morita, K., Fuchs, J., Chen, S., Nakatsutsumi, M., Rousseaux, C., Filippi, F., Nazarov, W., & Tanaka, K. A. (2014). Collimated fast electron beam generation in critical density plasma. Physics of Plasmas, 21(11), and may be found at: http://dx.doi.org/10.1063/1.4900868
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