Determination of the Charge per Micro-Bunch of a Self-Modulated Proton Bunch using a Streak Camera
Abstract
The Advanced Wakefield Experiment (AWAKE) develops the first plasma wakefield accelerator with a high-energy proton bunch as driver. The 400GeV bunch from CERN Super Proton Synchrotron (SPS) propagates through a 10m long rubidium plasma, ionized by a 4TW laser pulse co-propagating with the proton bunch. The relativistic ionization front seeds a self-modulation process. The seeded self-modulation transforms the bunch into a train of micro-bunches resonantly driving wakefields. We measure the density modulation of the bunch, in time, with a streak camera with picosecond resolution. The observed effect corresponds to alternating focusing and defocusing fields. We present a procedure recovering the charge of the bunch from the experimental streak camera images containing the charge density. These studies are important to determine the charge per micro-bunch along the modulated proton bunch and to understand the wakefields driven by the modulated bunch.
Keywords
Cite
@article{arxiv.1912.02162,
title = {Determination of the Charge per Micro-Bunch of a Self-Modulated Proton Bunch using a Streak Camera},
author = {A. -M. Bachmann and P. Muggli},
journal= {arXiv preprint arXiv:1912.02162},
year = {2020}
}
Comments
EAAC2019 Conference Proceedings, 9 pages, 16 figures