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Evolution of a high-density electron beam in the field of a super-intense laser pulse

Published online by Cambridge University Press:  07 July 2008

V.V. Kulagin ,
V.A. Cherepenin ,
M.S. Hur ,
J. Lee  and
H. Suk
V.V. Kulagin
Affiliation:
APRI and School of Photon Science and Technology, GIST, Gwangju, Republic of Korea
V.A. Cherepenin
Affiliation:
Institute of Radioengineering and Electronics RAS, Moscow, Russia
M.S. Hur
Affiliation:
Center for Advanced Accelerators, KERI, Ansan, Republic of Korea
J. Lee
Affiliation:
APRI and School of Photon Science and Technology, GIST, Gwangju, Republic of Korea
H. Suk*
Affiliation:
APRI and School of Photon Science and Technology, GIST, Gwangju, Republic of Korea
*
Address correspondence and reprint requests to: Hyyong Suk, APRI and School of Photon Science and Technology, GIST, Gwangju 500-712, Republic of Korea. E-mail: [email protected]
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Abstract

The evolution of a high-density electron beam in the field of a super-intense laser pulse is considered. The one-dimensional (1D) theory for the description of interaction, taking into account the space-charge forces of the beam, is developed, and exact solutions for the equations of motion of the electrons are found. It was shown that the length of the high-density electron beam increases slowly in time after initial compression of the beam by the laser pulse as opposed to the low-density electron beam case, where the length is constant on average. Also, for the high-density electron beam, the sharp peak frozen into the density distribution can appear in addition to a microbunching, which is characteristic for a low-density electron beam in a super-intense laser field. Characteristic parameters for the evolution of the electron beam are calculated by an example of a step-like envelope of the laser pulse. Comparison with 1D particle-in-cell simulations shows adequacy of the derived theory. The considered issue is very important for a special two-pulse realization of a Thomson scattering scheme, where one high-intensity laser pulse is used for acceleration, compression and microbunching of the electron beam, and the other probe counter-streaming laser pulse is used for scattering with frequency up-shifting and amplitude enhancement.

Keywords

Laser-plasma interactionMicrobunching of electron beamsSuper-intense laser pulseUltrashort electron beams
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 3 , September 2008 , pp. 397 - 409
Copyright
Copyright © Cambridge University Press 2008

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