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TY - CONF AU - Roussel, R.J. AU - Andonian, G. AU - Conde, M.E. AU - Doran, D.S. AU - Ha, G. AU - Lynn, W.J. AU - Power, J.G. AU - Rosenzweig, J.B. AU - Seok, J. AU - Whiteford, C. AU - Wisniewski, E.E. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Probing Multiperiod Plasma Response Regimes using Single Shot Wakefield Measurements J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - Systematic differences between the linear and nonlinear regimes of plasma wakefield acceleration from electron beams are manifested in the plasma response. Typically, the ratio of peak beam density to nominal plasma density determines operation in the linear or nonlinear regime. Previous reports have shown that a the cross-over into the nonlinear regime is associated with an increase in the wakefield amplitude, as well as sawtooth-like shape. In this paper, we present preliminary measurements of quasi-nonlinear wakefields driven by a linearly ramped beam, with a maximum charge close to the unperturbed plasma density. We also demonstrate nonlinear wakefield behavior in a probe bunch using a single shot, multi-period wakefield measurement and its dependency on plasma density. PB - JACoW Publishing CP - Geneva, Switzerland SP - 878 EP - 881 KW - plasma KW - wakefield KW - electron KW - emittance KW - cathode DA - 2019/10 PY - 2019 SN - 2673-7000 SN - 978-3-95450-223-3 DO - doi:10.18429/JACoW-NAPAC2019-WEPLO19 UR - http://jacow.org/napac2019/papers/weplo19.pdf ER -