Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Low Temperature Plasmas I
P 5.3: Vortrag
Montag, 17. März 2014, 17:25–17:40, SPA HS201
A high power helicon discharge as prototype for a plasma wakefield accelerator experiment — •Birger Buttenschön1, Philipp Kempkes1,2, Olaf Grulke1, and Thomas Klinger1,2 — 1Max-Planck-Institut für Plasmaphysik, EURATOM Assoziation, Greifswald — 2Ernst Moritz Arndt-Universität Greifswald
Proton-driven plasma wakefield accelerators (PWAs) are a very promising concept for future electron/positron accelerators with output beam energies in the TeV range. Simulations show that considerable acceleration is achieved at plasma densities exceeding ne = 7× 1019 m−3, with high demands on the axial plasma density homogeneity.
A commonly used approach for PWAs is to use laser generated plasmas, which are limited in length by the available laser energy. Helicon wave heated plasmas, however, do not suffer from this limitation, since the heating power can be injected via a distributed set of antennas along the plasma column. This approach is in principle scalable to arbitrary lengths, while the heating mechanism does not incorporate an intrinsic limit for the plasma density. However, unparalleled heating powers on the order of 50 kW/m are required to reach the envisaged plasma densities.
This contribution presents studies on a one meter long helicon wave heated plasma cell being designed as prototype for a proton-driven PWA experiment. At heating powers up to 35 kW, the plasma is characterized with respect to peak densities and overall performance compared to power balance calculations and wave dispersion relations.