Abstract
A precise characterization of the incoming proton bunch parameters is required to accurately simulate the self-modulation process in the Advanced Wakefield Experiment (AWAKE). This paper presents an analysis of the parameters of the incoming proton bunches used in the later stages of the AWAKE Run 1 data-taking period. The transverse structure of the bunch is observed at multiple positions along the beamline using scintillating or optical transition radiation screens. The parameters of a model that describes the bunch transverse dimensions and divergence are fitted to represent the observed data using Bayesian inference. The analysis is tested on simulated data and then applied to the experimental data.
Highlights
Plasma can sustain high electric fields and can be used to produce accelerating gradients larger than in conventional particle accelerators [1,2,3,4,5]
The proton bunches used in the Advanced Wakefield Experiment (AWAKE) experiment are produced in the CERN accelerator complex
We have developed and applied an approach to analyzing the parameters of the proton bunch in the AWAKE experiment
Summary
Plasma can sustain high electric fields and can be used to produce accelerating gradients larger than in conventional particle accelerators [1,2,3,4,5]. Ison of experimental observations to simulations requires correct bunch parameters. We present a determination of the parameters of the unmodulated proton bunch by combining the data from multiple beam imaging systems.
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