RT Journal Article
T1 Electron dynamics and Thomson scattering for ultra-intense lasers: elliptically polarized and OAM beams
A1 Pastor, Ignacio
A1 Álvarez Estrada, Ramón F.
A1 Roso, Luis
A1 Guasp, José
A1 Castejón, Francisco
AB We investigated the classical nonlinear Thomson scattering (TS), from a single relativistic electron, generated by either: (a) an incoming plane wave monochromatic laser radiation and general elliptical polarization or (b) incoming radiations with intrinsic orbital angular momentum (OAM). Both (a) and (b) propagate along the z direction, with wave vector k(0), frequency omega(0), and initial phase phi(0) not equal 0 and have any intensity. Item (a) enables obtaining general electron TS Doppler frequencies and other quantities, for fusion plasmas. We explored the possibility of approximating nonlinear TS with OAM beams (Item (b)) by means of nonlinear TS with plane wave beams (Item (a)). For Item (a), a general explicit solution of the Lorentz relativistic equation and the subsequent TS are given in terms of zeta = omega(0)t - k(0)z (t denoting time). In particular, it includes the cases for linear and circular polarizations and phi(0) not equal 0 for fusion plasmas, thereby extending previous studies for phi(0) = 0. The explicit solutions give rise to very efficient computations of electron TS Doppler frequencies, periods of trajectories, and drift velocities, and the comparisons with ab initio numerical solutions (for Item (a)) yield an excellent match. The approximate approach, using explicit solutions for Item (a), towards TS OAM (employing ab initio numerical computations for Item (b)), extending previously reported ones) yields a quite satisfactory agreement over time spans including several optical cycles, for a wide range of laser intensities, polarizations, and electron energies. The role of phi(0) not equal 0 was analyzed. A simple quantitative criterion to predict whether the agreement between the two approaches (a) and (b) would be observed over a given time span is discussed.
PB MDPI
SN 2304-6732
YR 2021
FD 2021-06
LK https://hdl.handle.net/20.500.14352/7404
UL https://hdl.handle.net/20.500.14352/7404
LA eng
NO © 2021 by the authors.Ministerio de Ciencia, Innovacion y Universidades (Spain) [RTI2018-100835-B-I00, RTI2018-096967-B-I00]; Ministerio de Ciencia, Innovacion y Universidades (Spain) - FEDER [PGC2018-094684-B-C21]; Ministerio de Ciencia, Innovacion y Universidades (Spain) through the PALMA [FIS2016-81056-R]; LaserLab Europe V Grant [871124]; Junta de Castilla y Leon [CLP087U16]; FEDER
NO Unión Europea. H2020
NO Ministerio de Ciencia e Innovación (MICINN)/ FEDER
NO Ministerio de Ciencia e Innovación (MICINN)
NO Junta de Castilla y Leon
DS Docta Complutense
RD 8 abr 2025