If one particle accelerator alone is not enough to achieve the desired result, why not combine two accelerators? An international team led by physicists at the Center for Advanced Laser Applications (CALA) at LMU Munich has implemented this idea. It combined two plasma-based acceleration methods for electrons, namely a laser-driven wakefield accelerator (LWFA) with a particle-beam-driven wakefield accelerator (PWFA).
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Source: Phys.org