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A: Atomphysik

A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)

A 12.7: Poster

Donnerstag, 5. April 2001, 12:30–15:00, AT3

H⁻–Neutralization in Plasmatargets — •A. Schönfeld¹, D.B. Uskov², L.P. Pesnyakov², and E. Salzborn¹ — ¹Institut für Kernphysik, Universität Giessen, Leihgesterner Weg 217, D-35392 Giessen, Germany — ²P.N. Lebedev Physical Institute, Moscow, Russia

The conventional method of producing an energetic neutral hydrogen-beam for neutral beam heating of future fusion plamas, i.e. neutralizing H⁻ in a gastarget, offers only an efficiency of about 50% at injection energies above 100 keV. The electron detachment cross section of the process H⁻+X^q+→ H⁰ + … is about one order of magnitude larger than that of the reaction H⁻+X⁰→ H⁰ +… . Due to this fact, the efficiency in a plasmatarget should be much higher than that in a gastarget. Simulations have shown that a neutralization efficiency in excess of 80% can be reached.

The experiment presented was designed to demonstrate the validity of these simulations. The plasma of a modified 2.45 GHz ECR ion source is used as a target.

First results for the neutralization of a 110 keV H⁻–beam in the plasmatarget will be shown at the conference and compared to the data obtained using a gastarget.