Erlangen 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 1: Magnetic Confinement I

P 1.2: Vortrag

Montag, 16. März 2026, 15:10–15:35, KH 02.016

Modeling of the BATMAN Upgrade ion-source using the CsFlow3D code — •Daniele Mussini, Christian Wimmer, Dirk Wünderlich, and Ursel Fantz — Max-Planck-Institut für Plasmaphysik (IPP), Boltzmannstr. 2, 85748 Garching

The ion sources for the neutral beam injectors (NBI) of ITER rely on the production of negative hydrogen ions on a surface featuring a low work function (plasma grid, PG). Cs is continuously evaporated into the source forming a layer on the PG in order to reduce the work function to low values (<2eV). However, the redistribution of Cs inside the source and the interaction of the plasma with the source surfaces lead to a temporally unstable and inhomogeneous Cs layer. The knowledge of Cs fluxes onto and out of the PG becomes thus necessary in order to be able to carry out stable long pulses at ITER's requirements (several hundred s in H, 3600s in D). Yet, the neutral Cs density can be measured, Cs fluxes are experimentally not accessible. The Monte-Carlo Test-Particle code CsFlow3D is used to model the Cs dynamics inside the BATMAN Upgrade ion-source exploiting several inputs such as plasma parameters, electromagnetic field as well as sticking coefficients. For the first time, 3D plasma parameters from a fluid code are implemented in CsFlow3D. Three different synthetic lines of sight for the quantification of neutral Cs are implemented into the code to validate the code with the experiment. This contribution presents preliminary results after the implementation of the new plasma parameters.

Keywords: Cs; BATMAN Upgrade; TDLAS; ITER; IPP