DC-like Phase Space Manipulation and Particle Acceleration Using Chirped AC Fields

Fisch, P.F. Schmit and N.J.

Princeton University. Plasma Physics Laboratory.

关键词: Acceleration;    Phase Space;    Resonance Current Drive,Ohmic Heating, Stochasticity;    70 Plasma Physics And Fusion Technology;    Current Drive,Ohmic Heating, Stochasticity;   

DOI  :  10.2172/958401
RP-ID  :  PPPL-4419
RP-ID  :  DE-AC02-09CH11466
RP-ID  :  958401

美国|英语

来源: UNT Digital Library

【 摘 要 】

Waves in plasmas can accelerate particles that are resonant with the wave. A DC electric field also accelerates particles, but without a resonance discrimination, which makes the acceleration mechanism profoundly different. We investigate the effect on a Hamiltonian distribution of an accelerating potential waveform, which could, for example, represent the average ponderomotive effect of two counterpropagating electromagnetic waves. In particular, we examine the apparent DC-like time-asymptotic response of the distribution in regimes where the potential structure is accelerated adiabatically. A highly resonant population within the distribution is always present, and we characterize its nonadiabatic response during wave-particle resonance using an integral method in the noninertial reference frame moving with the wave. Finally, we show that in the limit of infinitely slow acceleration of the wave, these highly resonant particles disappear and the response