Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 19: Plasma Diagnostics IV

P 19.1: Vortrag

Mittwoch, 15. März 2017, 15:00–15:15, HS 1010

Investigation of the self-modulation seeding by a short electron bunch within a long proton bunch — •Mathias Julius Hüther — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Deutschland — Technische Universität München, Deutschland

The AWAKE (Advanced Wakefield Experiment) at CERN is world’s first proton-driven plasma wakefield accelerator aiming for acceleration of externally injected electrons in gradients up to the GeV/m scale.
The 12 cm long proton bunch from CERN’s Super Proton Synchotron (SPS) propagates through a 10–m long laser induced plasma channel and is split into a train of micro-bunches on the order of the plasma wavelength by its electromagnetic interaction with the plasma.
This modulation is caused by the self-modulation instability (SMI), a transverse plasma instability. According to simulations, this instability does not significantly grow over a meter scale and in the experimental plan is therefore seeded by having an ionizing laser beam co-propagating at the centre of the proton bunch.
In this talk, we present calculations and simulations for a different concept of seeding the SMI by electron injection. The timing between laser and protons is shifted, so that the whole proton bunch propagates through a preformed plasma. The proton beam current is modulated by the external injection of a short electron bunch in the centre of the proton beam. The resulting sharp rise of the total current drives large wakefields that seed the growth of the SMI.
This seeding technique will also be tested experimentally.