Laser-ionized, beam-driven, underdense, passive thin plasma lens

Doss, C. E. and Adli, E. and Ariniello, R. and Cary, J. and Corde, S. and Hidding, B. and Hogan, M. J. and Hunt-Stone, K. and Joshi, C. and Marsh, K. A. and Rosenzweig, J. B. and Vafaei-Najafabadi, N. and Yakimenko, V. and Litos, M. (2019) Laser-ionized, beam-driven, underdense, passive thin plasma lens. Physical Review Accelerators and Beams, 22 (11). 111001. ISSN 1098-4402 (

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We present a laser-ionized, beam-driven, passive thin plasma lens that operates in the nonlinear blowout regime. This thin plasma lens provides axisymmetric focusing for relativistic electron beams at strengths unobtainable by magnetic devices. It is tunable, compact, and it imparts little to no spherical aberrations. The combination of these features make it more attractive than other types of plasma lenses for highly divergent beams. A case study is built on beam matching into a plasma wakefield accelerator at SLAC National Accelerator Laboratory's FACET-II facility. Detailed simulations show that a thin plasma lens formed by laser ionization of a gas jet reduces the electron beam's waist beta function to half of the minimum value achievable by the FACET-II final focus magnets alone.