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Sep 18 – 24, 2022
Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy
Europe/Rome timezone

Hosing of a long proton bunch induced by an electron bunch

Sep 19, 2022, 4:45 PM
Sala Maria Luisa - Hotel Hermitage

Sala Maria Luisa - Hotel Hermitage

Invited talk Special Topic


Tatiana Nechaeva (Max-Planck-Institut fur Physik (DE))


We study experimentally hosing [1] of a long proton bunch in plasma in AWAKE. We induce this process with misalignment between the trajectories of a preceding short electron bunch and that of the proton bunch. We observe hosing as transverse oscillation of the proton bunch centroid position in the plane of misalignment at the period of the wakefields. Self-modulation (SM) occurs in the perpendicular plane. The two processes (hosing and SM) are reproducible from event to event. Misalignment to the opposite sides with respect to the given bunch axis leads to the oscillations being in counter phase. The amplitude of oscillation increases with the proton bunch charge [2] and is also affected by the extent of misalignment.
We will present the latest experimental results.

[1] D. Whittum et al., Phys. Rev. Lett. 67, 991 (1991)
[2] C. Schroeder et al., Phys. Plasmas 20, 056704 (2013)

Primary author

Tatiana Nechaeva (Max-Planck-Institut fur Physik (DE))


Jan Pucek (Max-Planck Institute for Physics) livio verra (CERN) Michele Bergamaschi (Max-Planck-Institut für Physik/CERN) Giovanni Zevi Della Porta Patric Muggli (Max-Planck-Institut für Physik) AWAKE collaboration

Presentation materials