Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 23: Low Temperature Plasmas
P 23.13: Poster
Wednesday, March 15, 2017, 16:30–18:30, HS Foyer
Characterization of the high density helicon plasma cell PROMETHEUS-A for the Advanced Wakefield Experiment — •Birger Buttenschön, Nils Fahrenkamp, and Olaf Grulke — Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany
The Advanced Wakefield Experiment (AWAKE), the world’s first proton-beam driven plasma wakefield accelerator test facility, is currently being set up and commissioned at CERN in its first stage. In order to reach significant output beam energies, an accelerating plasma section that is scalable in length to tens or hundreds of meters is required. We present a prototype plasma cell based on a high power helicon discharge (Prf ≤ 100 MW/m3) with an axially distributed antenna system. In this prototype, accelerator-relevant plasma densities of ne ≤ 6 · 1020 m−3 are now routinely produced for short periods of time. The plasma is characterized by means of laser interferometry with respect to temporal density evolution, its radial distribution and the scaling with external control parameters such as ambient magnetic field, neutral gas inventory and specifics of the helicon wave coupling.