Plasma lenses for focusing particle beams.

摘要: The focusing of particles by a thin plasma lens is analyzed with physical, linearized fluid and particle-in-cell computational models. For parameters similar to next-generation linear colliders, the strength can exceed 100 MG/cm, luminosity be enhanced an order magnitude passing each beam through appropriate slab. electrons affect shifting so as (partially or completely) charge neutralize beam. Both overdense underdense lenses are described (plasma density ${\mathit{n}}_{0}$ greater less than ${\mathit{n}}_{\mathit{b}}$). former case applies equally well ${\mathit{e}}^{+}$ ${\mathit{e}}^{\mathrm{\ensuremath{-}}}$ beams, while latter has distinct advantages for beams (including smaller aberrations background). effects spherical longitudinal aberrations, emittance, boundaries, non-linear-plasma dynamics on final spot size discussed.