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Optimization of laser parameters for proton acceleration using double laser pulses in TNSA mechanism

Published online by Cambridge University Press:  03 March 2020

Saurabh Kumar  and
Devki Nandan Gupta Open the ORCID record for Devki Nandan Gupta [Opens in a new window]
Saurabh Kumar
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi110007, India
Devki Nandan Gupta*
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi110007, India
*
Author for correspondence: Devki Nandan Gupta, Department of Physics and Astrophysics, University of Delhi, Delhi110007, India. E-mail: dngupta@physics.du.ac.in
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Abstract

The energy of protons accelerated by ultra-intense lasers in the target normal sheath acceleration (TNSA) mechanism can be greatly enhanced by the laser parameter optimization. We propose to investigate the optimization of laser parameters for proton acceleration using double laser pulses in TNSA mechanism. The sheath field generation at the rear side of the target is significantly affected by the introduction of second laser pulse in TNSA mechanism, and consequently, the energy of the accelerated protons is also modified. The second laser pulse was introduced with different delays to study its impact on proton acceleration. Our study shows that the interplay of laser intensity and pulse duration of both laser pulses affects the proton acceleration. It was found that the proton maximum energy is the function of both laser intensity and pulse duration. A number of simulations have been performed to obtain maximum proton energy data under different combinations of laser intensity and pulse duration for the two laser pulses. The simulation results account for the underline physics for the proton bunch energy and the sheath field as a function of pulse intensity and pulse delay.

Keywords

Laser–plasma interactionproton accelerationultrashort laser pulse
Type
Research Article
Information
Laser and Particle Beams , Volume 38 , Issue 2 , June 2020 , pp. 73 - 78
Copyright
Copyright © The Author(s) 2020. Published by Cambridge University Press

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