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Published on: January 28, 2019
Energetic electron-bunch generation in a phase-locked longitudinal laser electric field
K D Xiao1, T W Huang1, L B Ju2
1Center for Applied Physics and Technology, HEDPS, and School of Physics, Peking University, Beijing 100871, People's Republic of China.
Abstract:
Energetic electron acceleration processes in a plasma hollow tube irradiated by an ultraintense laser pulse are investigated. It is found that the longitudinal component of the laser field is much enhanced when a linear polarized Gaussian laser pulse propagates through the plasma tube. This longitudinal field is of π/2 phase shift relative to the transverse electric field and has a π phase interval between its upper and lower parts. The electrons in the plasma tube are first pulled out by the transverse electric field and then trapped by the longitudinal electric field. The trapped electrons can further be accelerated to higher energy in the presence of the longitudinal electric field. This acceleration mechanism is clearly illustrated by both particle-in-cell simulations and single particle modelings.
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