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An enhanced ionization injection scheme using a tightly focused laser pulsewith intensity near the ionization potential to trigger the injection processin a mismatched pre-plasma channel has been proposed and examined viamulti-dimensional particle-in-cell simulations. The core idea of the proposedscheme is to lower the energy spread of trapped beams by shortening theinjection distance. We have established theory to precisely predict theinjection distance, as well as the ionization degree of injection atoms/ions,electron yield and ionized charge. We have found relation between injectiondistance and laser and plasma parameters, giving a strategy to controlinjection distance hence optimizing beam's energy spread. In the presentedsimulation example, we have investigated the whole injection and accelerationin detail and found some unique features of the injection scheme, likemulti-bunch injection, unique longitudinal phase-space distribution, etc.Ultimate electron beam has a relative energy spread (rms) down to 1.4% with itspeak energy 190 MeV and charge 1.7 pC. The changing trend of beam energy spreadindicates that longer acceleration may further lower the energy spread down toless than 1%, which may have potential in applications related to futurecoherent light source driven by laser-plasma accelerators.

plasma physics and controlled fusion

Generation of Low Absolute Energy Spread Electron Beams in Laser  Wakefield Acceleration Using Tightly Focused Laser through  Near-Ionization-Threshold Injection