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Commissioning of the electron injector for the AWAKE experiment

MPS-Authors

-Y Kim,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Doebert,  S.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Apsimon,  O.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Moody,  J.T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al., 
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

-Y Kim, S., Doebert, S., Apsimon, O., Moody, J., & et al. (2020). Commissioning of the electron injector for the AWAKE experiment. Nuclear Instruments and Methods in Physics Research Section A, 953, 163194. doi:10.1016/j.nima.2019.163194.


Cite as: http://hdl.handle.net/21.11116/0000-0008-1C6D-0
Abstract
The advanced wakefield experiment (AWAKE) at CERN is the first proton beam-driven plasma wakefield acceleration experiment. The main goal of AWAKE RUN 1 was to demonstrate seeded self-modulation (SSM) of the proton beam and electron witness beam acceleration in the plasma wakefield. For the AWAKE experiment, a 10-meter-long Rubidium-vapor cell together with a high-power laser for ionization was used to generate the plasma. The plasma wakefield is driven by a 400 GeV/c proton beam extracted from the super proton synchrotron (SPS), which undergoes a seeded self-modulation process in the plasma. The electron witness beam used to probe the wakefields is generated from an S-band RF photo-cathode gun and then accelerated by a booster structure up to energies between 16 and 20 MeV. The first run of the AWAKE experiment revealed that the maximum energy gain after the plasma cell is 2 GeV, and the SSM mechanism of the proton beam was verified. In this paper, we will present the details of the AWAKE electron injector. A comparison of the measured electron beam parameters, such as beam size, energy, and normalized emittance, with the simulation results was performed.