System of Slow Highly Charged Ion Beam Generation Using a Cold Positron Plasma Trap at RIKEN

A system to generate ultra-slow beams of highly ionized ions (HCIs) is under construction at RIKEN for studying collision processes of slow HCIs with atoms, molecules and surfaces. HCIs beams produced with an ECR ion source are transported to a multi-electrode trap, which can include several local harmonic potential wells enabling to confine different nonneutral plasmas of oppositely charged particles. Injected HCIs are decelerated by a dense electron plasma and then, to evade their recombination with electrons, cooled further with a positron plasma under cyclotron radiation cooling. This electron plasma also works as the damper of slow positrons at their loading into the trap. The cold HCIs are finally extracted from the trap as an ultra-slow beam with well-defined energy and used for slow collision experiments. This article is from CP606, Non-Neutral Plasma Physics IV, p634-640, 2001. Pub. in AIP Conference Proceedings: volume 606. Prepared in cooperation with Ernst-Moritz-Arndt-Universitaet, Greifswald, Germany; Atomic Physics Lab. The Inst. of Physical and Chemical Research (RIKEN), Wako, Japan. This article is from ADA404831 Non-Neutral Plasma Physics 4. Workshop on Non-Neutral Plasmas (2001) Held in San Diego, California on 30 July-2 August 2001