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O: Fachverband Oberflächenphysik

O 52: Poster Session - New Methods: Experiments

O 52.1: Poster

Dienstag, 17. März 2020, 18:15–20:00, P2/1OG

Design of an electron beam ion source for experiments with ultrafast timing resolution using SIMION simulations — •Johanna Fries¹, Anna Niggas¹, Gabriel L. Szabo¹, and Richard A. Wilhelm^1,2 — ¹TU Wien, Institute of Applied Physics, Vienna, Austria — ²Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany

The interaction of ions with a solid surface is characterized by many different processes, such as sputtering, electron emission and nanostructuring. Time scales of these processes span from the sub-fs regime for charge exchange to the µs-regime for ion-induced defect diffusion. In order to investigate the dynamics of at least some of these processes in experiment, ion pulses with a pulse length and timing accuracy in the sub-ps range are necessary.

With the help of SIMION simulations we develop the design of an electron beam ion source (EBIS) capable of producing such ultrashort ion pulses. Our design uses a simple Ti:Sapphire oscillator as electron pulse trigger in contrast to high power or high harmonics laser systems for photo-ionization. Starting from the design of a commercial EBIS, several parts will be replaced with tailor-made components in SOLIDWORKS. The CAD drawing is then used for a particle trajectory simulation based on the code SIMION. To optimize the ion source performance with regard to pulse length, beam focus and output, parameters such as spatial dimensions and potentials are varied and systematically analyzed.