Acceleration of Electron by an Azimuthally Polarized Laser Pulse Propagating Through an Ion Channel

Abstract

This study aimed to scrutinize the acceleration of an electron in a performed ion channel by an azimuthally polarized (AP) laser pulse. An electron can gain significant energy due to the combined role of azimuthal polarization and the effect of an ion channel. A resonance occurs between the betatron oscillatory motion of the electron and AP laser pulse. The electron transverse momentum grows because of the betatron resonance, and this transverse momentum is then converted into the longitudinal momentum by →v×→B force. The effects of the initial conditions of an injected electron, laser pulse intensity, and ion channel density are investigated for efficient electron acceleration. If an ion channel with appropriate density is used, the resonance can be maintained for a longer time, and the final energy of electron increases. The results indicated that in the presence of ion channel the electron final energy is enhanced ten times compared to the absence of ion channel and reaches to about 1.5 GeV, for AP laser intensity I ≈ 3.42×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">19</sup> W/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and ion channel density of n <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">i</sub> ≈ 1.1×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">16</sup> 1/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> .