Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 19: Collisions, scattering and correlation phenomena
A 19.4: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
A powerful new electron gun for electron-ion crossed-beams experiments — •Benjamin Ebinger1,2, Alexander Borovik Jr.1,2, Stefan Schippers1,2, and Alfred Müller2 — 1I. Physikalisches Institut, Justus-Liebig-Universität Gießen — 2Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen
In an electron-ion crossed-beams experiment, the experimental sensitivity is mainly determined by the densities of both beams in the interaction region. Aiming at the extension of the available range of accessible electron energies and densities, a new high-power electron gun has been developed and fabricated. It delivers a ribbon-shaped beam with high currents at all energies variable between 10 and 3500 eV [1,2]. We report on recent progress in the development and the performance of this electron gun. First experiments have demonstrated the expected high electron currents in the interaction region and very good beam transmission. Meanwhile, the tests have entered the final phase as the electron gun has been integrated into the experimental crossed-beams setup in Gießen. Employing the animated crossed-beams technique [3], first ionization signals were measured. Several challenging issues connected with space-charge effects in the high-density electron beam were revealed and are currently being investigated.
[1] Shi et al., Nucl. Instr. Meth. Phys. Res. B 205 (2003) 201-206
[2] Borovik et al., J. Phys.: Conf. Ser. 488 (2014) 142007
[3] Müller et al., J. Phys. B. 18 (1985) 2993-3009