Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.6: Poster
Tuesday, March 29, 2022, 16:00–17:30, P
Current Filamentation Instabilities of Proton Beams in Proton Driven Wakefield Accelerators — •Erwin Walter1, Martin Weidl1, John Farmer2,3, Patric Muggli2, and Frank Jenko1 — 1Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 2Max Planck Institute for Physics, 80805 Munich, Germany — 3CERN - 1211 Geneva 23 - Switzerland
Plasma wakefield accelerators can generate electric-field gradients magnitudes larger than conventional accelerators. Using this technology, particle-physics experiments could be performed in much more compact devices.
The Advanced Wakefield Experiment (AWAKE) is a proof-of-concept proton-driven wakefield accelerator located at CERN. Seeded self-modulation, a controlled excitation of the longitudinal self-modulation instability, is exploited to modulate the proton bunch into a train of multiple smaller bunches along its axis. For alternative beam parameters, the electromagnetic Weibel-like beam filamentation instability could result in magnetic field amplification, perpendicular scattering and emittance growth. The experimental parameters have been specifically chosen to avoid filamentation.
Our research investigates which beam parameters are required for filamentation to appear and whether this parameter regime is accessible in future experiments. We present results from full-PIC simulations and compare to linear theory.