Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 31: Poster Session III
A 31.16: Poster
Thursday, March 9, 2017, 17:00–19:00, P OG1
Performance tests of a new electron gun for electron-ion crossed-beams experiments — •Tobias Molkentin1, Alexander Borovik Jr1, B. Michel Döhring1, Benjamin Ebinger1, Alfred Müller2, and Stefan Schippers1 — 1I. Physikalisches Institut, Justus-Liebig-Universität Gießen — 2Institut für Atom und Molekülphysik, Justus-Liebig-Universität Gießen
Reliable atomic input data are of crucial importance for the modeling of ionized-matter environments and other plasma related applications. Cross sections for electron impact ionization of atoms and ions are particularly important. The sensitivity of an electron-ion crossed-beams experiment is mainly determined by the densities of both beams in the interaction region. To achieve an extension of the available range of accessible electron energies and densities a new electron gun [1,2], which delivers a ribbon-shaped beam, has been integrated into the experimental crossed-beams setup in Giessen. Its designed range of electron energies reaches from 10 to 3500 eV with high electron currents at all energies. The gun consists of ten different electrodes allowing for a variety of operation modes. Here, we present the results of performance tests investigating the different operation modes of the new electron gun. Due to the high intensity of the electron beam we observed space charge related effects [3], which are currently being investigated in detail.
[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] A. Müller et al., Nucl. Instr. Meth. Phys. Res. B 24 (1987) 369