We report on the first direct experimental observation of the non-axi-symmetric Hosing Instability (HI) of a long, relativistic proton bunch propagating through a m-scale plasma in the AWAKE experiment at CERN analysing streak camera images and time-integrated radial bunch profiles. We show good agreement to a theoretical model of the HI and to particle-in-cell simulations. Moreover, we give evidence for a coupling of the bunch centroid oscillation to the bunch density modulation due to the Self-Modulation Instability.
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We report on the first direct experimental observation of the non-axi-symmetric Hosing Instability (HI) of a long, relativistic proton bunch propagating through a m-scale plasma in the AWAKE experiment at CERN analysing streak camera images and time-integrated radial bunch profiles. We show good agreement to a theoretical model of the HI and to particle-in-cell simulations. Moreover, we give evidence for a coupling of the bunch centroid oscillation to the bunch density modulation due to the Self...
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