Plasma and Fusion Research

Volume 8, 1201160 (2013)

Rapid Communications

Nonlocal Ponderomotive Force in a Super Gaussian Laser Beam and the Conditions for Long Time Scale Interaction
Natsumi IWATA1) and Yasuaki KISHIMOTO1,2)
1)
Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
2)
Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
(Received 26 April 2013 / Accepted 10 July 2013 / Published 15 November 2013)

Abstract

We have applied the theory of the nonlocal ponderomotive force which we derived recently using the noncanonical Lie perturbation approach to investigate a long time scale particle motion in a super Gaussian laser beam. In such a flat-top beam profile, the local field gradient is diminished near the axis, so that the conventional ponderomotive formula is hardly applied. Numerical analyses of the interaction time and its dependence on the initial position and momentum of particles show that the nonlocal effect of the ponderomotive force, which is associated with higher order spatial derivatives, regulates the dynamics predominantly and sensitively.

Keywords

ponderomotive force, nonlocal effect, super Gaussian laser beam, noncanonical Lie perturbation method

DOI: 10.1585/pfr.8.1201160

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This paper may be cited as follows:

Natsumi IWATA and Yasuaki KISHIMOTO, Plasma Fusion Res. 8, 1201160 (2013).