Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 7: Collisions, Scattering and Correlation Phenomena II (joint session A/MO)
A 7.6: Talk
Monday, March 2, 2026, 18:15–18:30, N 2
Electron gun optimization for electron-ion crossed-beams experiments — •B. Michel Döhring1,2, Kurt Huber1, Mirko Looshorn1,2, and Stefan Schippers1,2 — 1Justus-Liebig-Universität Gießen — 2Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt
Electron-impact ionization is a fundamental atomic collision process, which is of importance for a wide range of scientific and technical applications such as astrophysics, EUV lithography and fusion research [1].
Recent cross-section measurements with moderately charged xenon ions [2] and singly charged lanthanum ions [3] have demonstrated the excellent performance of our high-current electron gun, which we have designed and built in Giessen [4,5].
This gun has also served as a prototype of the transverse free electron target for CRYRING at GSI/FAIR [6].
Here, we report on our latest achievements in electron beam resolution, on measurements particularly in the low-energy region, and on future plans for optimizing the flexible electron gun.
[1] A. Müller, Adv. At. Mol. Opt. Phys. 55, 293 (2008).
[2] F. Jin et al., Eur. Phys. J. D 78, 68 (2024).
[3] B. M. Döhring et al., Atoms 13, 2 (2025).
[4] W. Shi et al., Nucl. Instrum. Meth. B 205, 201 (2003).
[5] B. Ebinger et al., Nucl. Instrum. Meth. B 408, 317 (2017).
[6] M. Lestinsky et al., Eur. Phys. J. ST 225, 797 (2016).
Keywords: electron ion collisions; electron gun