Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 21: Laser Plasmas - Poster
P 21.1: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Zelt West
The Hosing Instability in AWAKE — •Mathias Hüther1,2, Allen Caldwell1,2, and Patric Muggli1,3 — 1Max-Planck-Institut für Physik, München — 2Technische Universität München — 3CERN, Genf, Schweiz
AWAKE (Advanced Wakefield Experiment) is located at CERN. It is world’s first proton-driven plasma wakefield accelerator. It aims for acceleration of externally injected electrons in gradients up to the GeV/m scale. It uses a 12 cm long proton bunch from the CERN Super Proton Synchotron (SPS) that propagates through a 10 m long Rubidium plasma channel (with a particle density of 1-10 · 1014 cm−3), induced by a high-power short laser pulse (pulse duration τ = 120 fs, pulse energy E = 450 mJ).
The process of Seeded-Self Modulation (SSM) results in the break-up of the long proton bunch into a train of micro-bunches separated by a distance on the order of the plasma wavelength by the Self-Modulation Instability (SMI), a transverse plasma instability. The SMI growth is mainly competing with the Hosing-Instability (HI). Under certain conditions this can lead to unstable SMI growth process and eventually to no development or even a destruction of the micro-bunch structures.
In this talk, we give a short introduction to SSM, SMI and HI-processes. Furthermore, we discuss conditions for a growth of the HI as well as possibilities for its suppression.