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Title: Breaking of dynamical adiabaticity in direct laser acceleration of electrons

Here, the interaction of an electron oscillating in an ion channel and irradiated by a plane electromagnetic wave is considered. It is shown that the interaction qualitatively changes with the increase of electron energy, as the oscillations across the channel become relativistic. The “square-wave-like” profile of the transverse velocity in the relativistic case enables breaking of the adiabaticity that precludes electron energy retention in the non-relativistic case. For an electron with a relativistic factor $$\gamma$$ 0, the adiabaticity breaks if ω Lp0$$\ll$$$\sqrt{\gamma0}$$. Under these conditions, the kinetic energy acquired by the electron is retained once the interaction with the laser field ceases. This mechanism notably enables electron heating in regimes that do not require a resonant interaction between the initially oscillating electron and the laser electric field.
Authors:
 [1] ; ORCiD logo [2]
  1. STFC Rutherford-Appleton Lab., Didcot (United Kingdom). Central Laser Facility
  2. Univ. of Texas, Austin, TX (United States). Center for High Energy Density Science
Publication Date:
Grant/Contract Number:
NA0002008
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 2; 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)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; oscillators; electromagnetic interactions; plasma channeling; ion channels; plasma waves; electron radiation effects; speed of light; electric fields; magnetic fields
OSTI Identifier:
1465477
Alternate Identifier(s):
OSTI ID: 1349336