Volume 108, Number 3, November 2014
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||07 November 2014|
Effect of plasma density profile inhomogeneity on the self-generated magnetic field
1 Department of Physics, Kerman Branch, Islamic Azad University - Kerman, Iran
2 Faculty of Physics, Shahid Bahonar University of Kerman - Kerman, Iran
3 Department of Physics, Sharif University of Technology - Tehran, Iran
Received: 10 July 2014
Accepted: 9 October 2014
The photon orbital and/or spin angular-momentum absorption in absorbing plasma medium causes the circular motion of electrons and generate the azimuthal component of current density. The axial magnetic field generation due to the azimuthal component of generated current density is known as inverse Faraday effect. In this paper, the axial magnetic field generation in an absorbing plasma with ramped density by the propagation of linear polarized Laguerre-Gaussian beam is taken into consideration. It is shown that the positive slope of the initial electron density causes a considerable enhancement of self-generated axial magnetic field. The magnetic field enhancement depends on the twisted light vortex charge number. The rotation angle of the linearly polarized light which can be employed for measurement of the generated magnetic field, is calculated.
PACS: 52.38.Fz – Laser-induced magnetic fields in plasmas / 52.35.Mw – Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.) / 52.59.-f – Intense particle beams and radiation sources
© EPLA, 2014
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