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Resonant enhancement of electron energy by frequency chirp during laser acceleration in an azimuthal magnetic field in a plasma

Published online by Cambridge University Press:  19 June 2008

K.P. Singh  and
H.K. Malik
K.P. Singh*
Affiliation:
Simutech, Gainesville, Florida
H.K. Malik
Affiliation:
Plasma Waves and Particle Acceleration Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi, India
*
Address correspondence and reprint requests to: Kunwar Pal Singh, Simutech, 3521 SW 31st. Drive, Gainesville, FL 32608. E-mail:k_psingh@yahoo.com
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Abstract

Electron acceleration by a chirped laser pulse in an azimuthal magnetic field in a plasma has been studied. The betatron resonance saturates and the electrons start losing energy beyond a specific point of time without a frequency chirp. The resonance can be maintained for a longer duration and the energy of the electrons can be enhanced if a suitable frequency chirp is introduced. The duration of interaction increases for a lower plasma density or a lower initial electron energy which causes increase in the electron energy gain. The value of magnetic field required for resonance increases with an increase in plasma density and with a decrease in initial electron energy.

Keywords

Electron accelerationFrequency chirpLaser plasmaMagnetic field
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 3 , September 2008 , pp. 363 - 369
Copyright
Copyright © Cambridge University Press 2008

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