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Schematic of a hybrid LWFA–PWFA staged setup with ionization injection. The set-up consists of two quasi-identical plasma acceleration stages coupled to each other. In each stage, the injection of a witness beam is induced by field-ionization from the dopant species contained in the gas jet. Immediately after the gas jet, a longer plasma cell with no dopant is used to further accelerate the generated witness beam. (Online version in colour.)
