skip to main content

SciTech ConnectSciTech Connect

Title: Laser pulse propagation in inhomogeneous magnetoplasma channels and wakefield acceleration

Wakefield excitation in a preformed inhomogeneous parabolic plasma channel by an intense relativistic (≃10{sup 19} W/cm{sup 2}) circularly polarized Gaussian laser pulse is investigated analytically and numerically in the presence of an external longitudinal magnetic field. A three dimensional envelope equation for the evolution of the laser pulse is derived, which includes the effect of the nonparaxial and applied external magnetic field. A relation for the channel radius with the laser spot size is derived and examines numerically to see the external magnetic field effect. It is observed that the channel radius depends on the applied external magnetic field. An analytical expression for the wakefield is derived and validated with the help of a two dimensional particle in cell (2D PIC) simulation code. It is shown that the electromagnetic nature of the wakes in an inhomogeneous plasma channel makes their excitation nonlocal, which results in change of fields with time and external magnetic field due to phase mixing of the plasma oscillations with spatially varying frequencies. The magnetic field effect on perturbation of the plasma density and decreasing length is also analyzed numerically. In addition, it has been shown that the electron energy gain in the inhomogeneous parabolic magnetoplasma channel canmore » be increased significantly compared with the homogeneous plasma channel.« less
Authors:
;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. Government College Kota, Kota 324001 (India)
  2. Department of Pure and Applied Physics, University of Kota, Kota 324010 (India)
  3. Department of Physics and Astrophysics, University of Delhi, Delhi 110007 (India)
  4. Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 500-712 (Korea, Republic of)
  5. Sternberg Astronomical Institute of Moscow State University, Moscow 119992 (Russian Federation)
Publication Date:
OSTI Identifier:
22251996
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; DISTURBANCES; ELECTRONS; EXCITATION; HOMOGENEOUS PLASMA; INHOMOGENEOUS PLASMA; LASERS; MAGNETIC FIELDS; PLASMA DENSITY; PLASMA WAVES; PULSES; RELATIVISTIC RANGE; THREE-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL CALCULATIONS