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P: Plasmaphysik
P 12: Plasma Wall Interaction, Diagnostic and Low Temperature Discharges (Poster Session)
P 12.23: Poster
Freitag, 6. April 2001, 12:30–15:00, AT2
Magnetic field measurement in a high current gas embedded discharge — •D. Penache1,2, C. Niemann1,2, A. Tauschwitz1,2, R. Presura2, M. Geissel1,2, C. Penache3, R. Knobloch1,2, M. Roth2 und D.H.H. Hoffmann1,2 — 1Technische Universität Darmstadt — 2Gesellschaft für Schwerionenforschung, Darmstadt — 3J.W.Goethe Universität, Frankfurt/Main
Focusing and transport of ion beams in a gas discharge plasma is of interest for many applications using high power particle beams. The most challenging demands are found in the field of ion beam driven inertial confinement fusion. The ion optical properties of such a plasma channel are under investigation since a number of years at GSI. The discharge is initiated in low pressure (10-20 mbar) ammonia gas by the help of a CO2 laser. The total current can be increased up to 40 kA. A parallel ion beam of one centimeter diameter is injected through the discharge channel of 50 cm length. The trajectories of the ions in the channel are determined by the azimutal magnetic field. Therefore the knowledge of magnetic field distribution in time and along the radius is important. To determine this a magnetic probe was built. The probe contains 8 small coils in a line, thus being able to record simultanously the evolution of the magnetic field in 8 different points along the discharge radius. An increase of the magnetic field amplitude with increasing pressure was observed, in agreemet with the experimental data obtained from the ion beam transport through the discharge. This work is supported by BMBF