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Title: Spontaneous emergence of non-planar electron orbits during direct laser acceleration by a linearly polarized laser pulse

An electron irradiated by a linearly polarized relativistic intensity laser pulse in a cylindrical plasma channel can gain significant energy from the pulse. The laser electric and magnetic fields drive electron oscillations in a plane making it natural to expect the electron trajectory to be flat. We show that strong modulations of the relativistic γ-factor associated with the energy enhancement cause the free oscillations perpendicular to the plane of the driven motion to become unstable. As a consequence, out of plane displacements grow to become comparable to the amplitude of the driven oscillations and the electron trajectory becomes essentially three-dimensional, even if at an early stage of the acceleration it was flat. In conclusion, the development of the instability profoundly affects the x-ray emission, causing considerable divergence of the radiation perpendicular to the plane of the driven oscillations, while also reducing the overall emitted energy.
Authors:
ORCiD logo [1] ; ORCiD logo [1] ;  [2] ;  [1] ;  [3]
  1. The Univ. of Texas at Austin, Austin, TX (United States)
  2. STFC Rutherford-Appleton Lab., Didcot (United Kingdom)
  3. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Grant/Contract Number:
NA0002723; NA0002008; FG02-04ER54742; SC0007889; SC0010622; FG02- 04ER54742
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Texas, Austin, TX (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1469683
Alternate Identifier(s):
OSTI ID: 1238202