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Title: Universal scalings for laser acceleration of electrons in ion channels

Here, we analytically investigate the acceleration of electrons undergoing betatron oscillations in an ion channel, driven by a laser beam propagating with superluminal (or luminal) phase velocity. The universal scalings for the maximum attainable electron energy are found for arbitrary laser and plasma parameters by deriving a set of dimensionless equations for paraxial ultra-relativistic electron motion. One of our analytic predictions is the emergence of forbidden zones in the electrons' phase space. For an individual electron, these give rise to a threshold-type dependence of the final energy gain on the laser intensity. The universal scalings are also generalized to the resonant laser interaction with the third harmonic of betatron motion and to the case when the laser beam is circularly polarized.
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [1] ;  [3]
  1. Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies and Dept. of Physics
  2. Univ. of Texas, Austin, TX (United States). Center for High Energy Density Science
  3. Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies and Dept. of Physics; Cornell Univ., Ithaca, NY (United States). School of Applied and Engineering Physics
Publication Date:
Grant/Contract Number:
SC0007889; SC0010622; FA9550-14-1-0045; NA0002723; NA0002008; FG02-04ER54742
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 10; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); US Air Force Office of Scientific Research (AFOSR)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; kinematics; laser beams; betatrons; plasma channeling; equations of motion; Doppler effect; ion channels; electron beams; plasma waves; electric fields
OSTI Identifier:
1465155
Alternate Identifier(s):
OSTI ID: 1329487