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Experimental study of wakefields driven by a self-modulating proton bunch in plasma

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Article number081302
<mark>Journal publication date</mark>4/08/2020
<mark>Journal</mark>Physical Review Accelerators and Beams
Issue number8
Volume23
Number of pages8
Publication StatusPublished
<mark>Original language</mark>English

Abstract

We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. We show that the wakefields' growth and amplitude increase with increasing seed amplitude as well as with the proton bunch charge in the plasma. We study transverse wakefields using the maximum radius of the proton bunch distribution measured on a screen downstream from the plasma. We study longitudinal wakefields by externally injecting electrons and measuring their final energy. Measurements agree with trends predicted by theory and numerical simulations and validate our understanding of the development of self-modulation. Experiments were performed in the context of the Advanced Wakefield Experiment (AWAKE). © 2020 authors.