title: Physics of Phase Space Matching for Staging Plasma and Traditional Accelerator Components Using Longitudinally Tailored Plasma Profiles.
abstract: Phase space matching between two plasma-based accelerator (PBA) stages and between a PBA and a traditional accelerator component is a critical issue for emittance preservation. The drastic differences of the transverse focusing strengths as the beam propagates between stages and components may lead to a catastrophic emittance growth even when there is a small energy spread. We propose using the linear focusing forces from nonlinear wakes in longitudinally tailored plasma density profiles to control phase space matching between sections with negligible emittance growth. Several profiles are considered and theoretical analysis and particle-in-cell simulations show how these structures may work in four different scenarios. Good agreement between theory and simulation is obtained, and it is found that the adiabatic approximation misses important physics even for long profiles.
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.|University of California, Los Angeles, California 90095, USA.
authors.forename: X L
authors.initials: XL
authors.lastname: Xu
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: J F
authors.initials: JF
authors.lastname: Hua
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Y P
authors.initials: YP
authors.lastname: Wu
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: C J
authors.initials: CJ
authors.lastname: Zhang
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: F
authors.initials: F
authors.lastname: Li
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Wan
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
authors.forename: C-H
authors.initials: CH
authors.lastname: Pai
authors.affiliation: Department of Engineering Physics, Tsinghua University, Beijing 100084, China.|IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: W
authors.initials: W
authors.lastname: Lu
authors.affiliation: University of California, Los Angeles, California 90095, USA.
authors.forename: W
authors.initials: W
authors.lastname: An
authors.affiliation: University of California, Los Angeles, California 90095, USA.
authors.forename: P
authors.initials: P
authors.lastname: Yu
authors.affiliation: SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Hogan
authors.affiliation: University of California, Los Angeles, California 90095, USA.
authors.forename: C
authors.initials: C
authors.lastname: Joshi
authors.affiliation: University of California, Los Angeles, California 90095, USA.
authors.forename: W B
authors.initials: WB
authors.lastname: Mori