Speaker
Description
At the FACET-II national user facility, plasma wakefield acceleration (PWFA) experiments are advancing beam-driven concepts towards application-relevant performance. Using a 10 GeV, high brightness electron beam and a variety of plasma sources, we demonstrate stable, multi-GeV acceleration of externally and internally injected witness beams. In two-bunch linac operation with a 40 cm Li vapor plasma source, we achieve witness energy gains exceeding 5 GeV with sub‑percent relative energy spread and drive‑to‑witness energy transfer efficiencies greater than 10%. Machine learning-enabled beam tuning is used to improve beam density and transverse alignment between bunches, enhancing energy-transfer efficiency and limiting emittance growth. We will also report on the operation of a plasma brightness transformer using density downramp injection to simultaneously boost the energy and brightness of an electron bunch injected from the plasma, and other recent results.
| Working group | WG3 |
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