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TY - UNPB AU - Sahai, A. A. ED - Schaa, Volker RW ED - Power, Maria ED - Shiltsev, Vladimir ED - White, Marion TI - Crunch-in Regime - Non-linearly driven hollow-channel plasma J2 - Proc. of NAPAC2016, Chicago, IL, USA, October 9-14, 2016 C1 - Chicago, IL, USA T2 - North American Particle Accelerator Conference T3 - 3 LA - english AB - Plasma wakefields driven inside a hollow-channel plasma are significantly different from those driven in a homogeneous plasma. We investigate the scaling laws of the accelerating and focusing fields in the novel ''crunch-in'' regime [1] [2]. This regime is excited due to the collapse of the electron-rings from the channel walls onto the propagation axis of the energy-source in its wake. This regime is thus the non-linearly driven hollow channel, since the electron-ring displacement is of the order of the channel radius [3]. We present the properties of the coherent structures in the ''crunch-in'' regime where the channel radius is matched to the beam properties such that channel-edge to on-axis collapse time has a direct correspondence to the energy source intensity. We also investigate the physical mechanisms that underlie the ''crunch-in'' wakefields by tuning the channel radius. Using a theoretical framework and results from PIC simulations the possible applications of the ''crunch-in'' regime for acceleration of positron beams with collider-scale parameters is presented. PB - JACoW CP - Geneva, Switzerland ER -