Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 1: Collision Experiments

A 1.2: Talk

Monday, March 6, 2017, 15:00–15:15, HS 20

Commissioning of a high-power electron gun for electron-ion crossed-beams experiments — •Benjamin Ebinger¹, Alexander Borovik Jr.¹, B. Michel Döhring¹, Tobias Molkentin¹, Alfred Müller², and Stefan Schippers¹ — 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 built. It delivers a ribbon-shaped beam with high currents at all energies variable between 10 and 3500 eV [1,2]. The expected high electron currents and good beam transmission have already been shown.
Here, we report on the current status of commissioning of this electron gun. The electron gun is integrated into the experimental electron-ion crossed-beams setup in Giessen. Employing the animated crossed-beams technique [3], first cross sections for electron-impact ionization of xenon and helium ions were measured. The measurement of more cross sections is intended for the near future. Further investigations concerning, e.g., space-charge effects in the high-density electron beam are currently performed.

[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