强场粒子加速.pdf

Particle acceleration in plasma By Prof. C. S. Liu Department of Physics, NCU University of Maryland in collaboration with V. K. Tripathi, S. H. Chen, Y. Kuramitsu, L. C. Tai, S. Y. Chen, J. Wang, N. Kumar, and B. Eliasson Outline • Plasma universe • Plasma wave excitation and trapping of resonant electrons • Laser driven acceleration and production of the mono-energetic electrons beam • Ion acceleration • Concluding remark Plasma universe Plasma dominated Three minutes after Big Bang universe Radio jets, X-ray sources, γ-ray bursts, pulsar, accretion disk etc…. We observe our universe mostly by EM waves. Its dispersion relation, 2 2 2 2 ω = ω + k c p 2 2 vph ≅ c[1+ ωp / 2ω ] c 2 2 v ≅ c[1− ω /2ω ] c g p Cosmic ray acceleration Magnetosphere of the Earth “Mono-energetic” electrons on the Earth The Earth’s magnetic field and magnetosphere Cavity flow with reentrant jet “Why plasma is so capitalistic in giving so much energy to so few electrons” ?? Eugene Parker Plasma as medium for waves 2 2 2 2 Plasma wave ω = ω + 3k v p e v = k T