Speaker
Description
Flat-beam plasma wakefield acceleration can produce asymmetric blowout cavities, requiring theoretical descriptions beyond the usual cylindrically symmetric blowout model. We present a simulation comparison of an elliptic multipole expansion model for calculating charge and current distributions and wakefields in an asymmetric blowout cavity. The blowout boundary is extracted directly from transverse slices of WarpX particle-in-cell simulations at each longitudinal position and fitted by an ellipse, whose parameters are then used as input to the multipole calculation. The resulting source terms and wakefields are compared with the corresponding WarpX PIC data. We evaluate the transverse focusing fields, longitudinal accelerating field, and charge/current distributions, and identify discrepancies associated with finite sheath profiles and non-ideal blowout structure arising from the elliptical approximation, especially near the end of the blowout. These results assess the accuracy and limitations of the model and support future self-consistent modeling of blowout cavities and their associated wakefields.
| Working group | WG3 |
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