Fig. 1: Experimental layout and description of the scissor-cross ionization injection mechanism.
From: Demonstration of scissor-cross ionization injection in laser wakefield accelerators
a The driver laser and trigger laser focused at the same point 1.5 mm above the nozzle (along the central axis of the nozzle, 500 µm from the nozzle front edge). Topview shows the fluorescence captured from the plasma channel. b Illustration of pre-ionization and ionization injection processes of the scissor-cross ionization injection. The driving laser ionizes the outer-shell electrons of atoms, forming wakefield. When temporally and spatially synchronized with the trigger laser, the superimposed electric field ionizes the inner-shell electrons, leading to localized injection.
