Breaking of dynamical adiabaticity in direct laser acceleration of electrons

Robinson, A. P.  L.; Arefiev, A. V.

doi:10.1063/1.4975076

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

Journal Article · Wed Feb 01 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4975076· OSTI ID:1465477

Robinson, A. P. L. ^[1];

^[2]

STFC Rutherford-Appleton Lab., Didcot (United Kingdom). Central Laser Facility
Univ. of Texas, Austin, TX (United States). Center for High Energy Density Science

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_L/ω_p0$$\ll$$$$\sqrt{\gamma0}$$. 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.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002008

OSTI ID:: 1465477

Alternate ID(s):: OSTI ID: 1349336

Journal Information:: Physics of Plasmas, Vol. 24, Issue 2; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Field shaping and electron acceleration by center-depressed laser beams Wang, W.; Xia, L.; Xiong, J. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5099508	journal	September 2019
Extreme nonlinear dynamics in vacuum laser acceleration with a crossed beam configuration Robinson, A. P. L.; Tangtartharakul, K.; Weichman, K. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5115993	journal	September 2019

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