The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF
AU - Webb, S.D.
AU - Bruhwiler, D.L.
AU - Burov, A.V.
AU - Cook, N.M.
AU - Lebedev, V.A.
AU - Nagaitsev, S.
ED - Schaa, Volker RW
ED - Makino, Kyoko
ED - Snopok, Pavel
ED - Berz, Martin
TI - Theoretical and Computational Modeling of a Plasma Wakefield BBU Instability
J2 - Proc. of ICAP2018, Key West, FL, USA, 20-24 October 2018
CY - Key West, FL, USA
T2 - International Computational Accelerator Physics Conference
T3 - 13
LA - english
AB - Plasma wakefield accelerators achieve accelerating gradients on the order of the wave-breaking limit, m c² k_{p}/e, so that higher accelerating gradients correspond to shorter plasma wavelengths. Small-scale accelerating structures, such as plasma and dielectric wakefields, are susceptible to the beam break-up instability (BBU), which can be understood from the Panofsky-Wenzel theorem: if the fundamental accelerating mode scales as b⁻¹ for a structure radius b, then the dipole mode must scale as b⁻³, meaning that high accelerating gradients necessarily come with strong dipole wake fields. Because of this relationship, any plasma-accelerator-based future collider will require detailed study of the trade-offs between extracting the maximum energy from the driver and mitigating the beam break-up instability. Recent theoretical work* predicts the tradeoff between the witness bunch stability and the amount of energy that can be extracted from the drive bunch, a so-called efficiency-instability relation . We will discuss the beam break-up instability and the efficiency-instability relation and the theoretical assumptions made in reaching this conclusion. We will also present preliminary particle-in-cell simulations of a beam-driven plasma wakefield accelerator used to test the domain of validity for the assumptions made in this model.
PB - JACoW Publishing
CP - Geneva, Switzerland
SP - 341
EP - 344
KW - plasma
KW - wakefield
KW - impedance
KW - dipole
KW - simulation
DA - 2019/01
PY - 2019
SN - 978-3-95450-200-4
DO - DOI: 10.18429/JACoW-ICAP2018-WEPLG03
UR - http://jacow.org/icap2018/papers/weplg03.pdf
ER -