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- W2088132661 abstract "Acceleration and heating mechanisms of charged particles by a generalized electrostatic pulse, i.e., a dispersive and propagating pulse of various forms, are investigated analytically and numerically. Gaussian-shaped pulses of arbitrary group- as well as phase-velocities are considered, but the results should apply qualitatively to solitons and other pulses. Actions of ordinary wave packets, as well as extremely short pulses with less than one cycle (or wavelength) among others, are investigated. For these general pulses, it is found that there may exist four types of acceleration/heating mechanisms. If a particle’s initial velocity is sufficiently away from the central phase-velocity of the pulse and if the pulse is sufficiently short, there occurs a well-known but generalized transit-time acceleration. However, for relatively long pulses with more than a couple of wavelengths or cycles, the transit-time acceleration becomes rapidly ineffective in accelerating particles. In the vicinity of the central phase-velocity of the pulse, a new process called “quasi-trapping” occurs, usually giving rise to the greatest velocity shifts. It can at times also cause a novel particle reflection. Finally, in the vicinity of the group velocity of the pulse, there occurs another new reflection process driven by the ponderomotive force of the pulse. All of the analytic expressions obtained for these processes are generally in good to excellent agreement with numerical results." @default.
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- W2088132661 date "2002-08-22" @default.
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- W2088132661 title "Acceleration and heating of charged particles by a dispersive electrostatic pulse" @default.
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