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arXiv · 1912.02162

Determination of the Charge per Micro-Bunch of a Self-Modulated Proton Bunch using a Streak Camera

A. -M. Bachmann·P. Muggli
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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.

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A. -M. Bachmann, P. Muggli. 2019-12-04. Determination of the Charge per Micro-Bunch of a Self-Modulated Proton Bunch using a Streak Camera. https://doi.org/10.1088/1742-6596/1596/1/012005

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