Wakefield generation in hydrogen and lithium plasmas at FACET-II: Diagnostics and first beam-plasma interaction results
Published in Physical Review Accelerators and Beams, 2024
Abstract: Plasma wakefield acceleration provides ultrahigh acceleration gradients of tens of GeV/m, providing a novel path toward efficient, compact, TeV-scale linear colliders, and high brightness free electron lasers. Critical to the success of these applications is demonstrating simultaneously high gradient acceleration, high energy transfer efficiency, and preservation of emittance, charge, and energy spread. Experiments at the FACET-II National User Facility at SLAC National Accelerator Laboratory aim to achieve all of these milestones in a single-stage plasma wakefield accelerator, providing a 10 GeV energy gain in a <1 m plasma with high energy transfer efficiency. Such a demonstration depends critically on diagnostics able to measure emittance with mm mrad accuracy, energy spectra to determine both percent level energy spread, and broadband energy gain and loss, incoming longitudinal phase space, and matching dynamics. This paper discusses the experimental setup at FACET-II, including the incoming beam parameters from the FACET-II linac, plasma sources, and diagnostics developed to meet this challenge. Initial progress on the generation of beam ionized wakes in meter-scale hydrogen gas is discussed as well as commissioning of the plasma sources and diagnostics.
Recommended citation: Doug Storey, Chaojie Zhang, Pablo San Miguel Claveria, Gevy J. Cao, Erik Adli, Lauren Alsberg, Robert Ariniello, Christine Clarke, Sebastien Corde, Thamine N. Dalichaouch, Christopher E. Doss, Henrik Ekerfelt, Claudio Emma, Elias Gerstmayr, Spencer Gessner, Max Gilljohann, Carsten Hast, Alaxander Knetsch, Valentina Lee, Michael Litos, Ryan Loney, Ken A. Marsh, Aime Matheron, Warren B. Mori, Zan Nie, Brendan O’Shea, Marcellus Parker, Glen White, Gerald Yocky, Viktoriia Zakharova, Mark J. Hogan, Chan Joshi, "Wakefield generation in hydrogen and lithium plasmas at FACET-II: Diagnostics and first beam-plasma interaction results," Phys. Rev. Accel. Beams 27, 051302 (2024).
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