literature

A method for obtaining 3D charge density distribution of a self-modulated proton bunch

Collaboration
Jul 19, 2022
5 pages
Published in:
  • J.Phys.Conf.Ser. 2420 (2023) 1, 012063,
  • JACoW IPAC2022 (2022) 3118-3120
Contribution to:
  • Published: 2023
    and
  • Published: Jul 19, 2022
Experiments:

Citations per year

202120222023013
Abstract: (IOP)
The Advanced Wakefield Experiment (AWAKE) at CERN is the first plasma wakefield accelerator experiment to use a proton bunch as driver. The long bunch undergoes seeded self-modulation (SSM) in a 10 m-long plasma. SSM transforms the bunch into a train of short micro-bunches that resonantly drive high-amplitude wakefields. We use optical transition radiation (OTR) and a streak camera to obtain time-resolved images of the bunch transverse charge density distribution in a given plane. In this paper we present a method to obtain 3D images of the bunch by scanning the OTR across the entrance slit of the streak camera. Reconstruction of the 3D distribution is possible because with seeding self-modulation is reproducible. The 3D images allow for checking the axi-symmetry of SSM and for detecting the possible presence of the non-axi-symmetric hosing instability (HI).