Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 9: Poster I
P 9.10: Poster
Tuesday, March 29, 2022, 16:00–17:30, P
Coupling of 3D-PIC and ion optics simulations for studies of H− beam formation and co-extraction of e− — •Max Lindqvist1,2, Niek den Harder1, Adrien Revel2, Serhiy Mochalskyy1, Tiberiu Minea2, and Ursel Fantz1 — 1Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2Université Paris-Saclay, CNRS, LPGP, Orsay, France
The ITER Neutral Beam Injection system requires a beam of negative ions (NI) with low divergence and high current density. The NIs are produced in RF ion sources, and extracted by application of an electric field; co-extracted e− are dumped onto the extraction grid. The equipotential surface between the plasma and extracted NI beamlet, referred to as the meniscus, determines the beamlet properties to a large extent. 3D PIC modeling is needed for self-consistent simulation of the meniscus formation, NI extraction and co-extraction of e−. Due to the high computational cost of 3D PIC modeling, extending the simulation beyond the extraction region is unfeasable. To study the beam properties of NIs and co-extraction of e− in the ELISE ion source, a half-size ITER-like ion source operated in IPP Garching, the 3D PIC-MCC code ONIX is coupled with the beam code IBSimu. This allows coupling of particle properties from the plasma, to the meniscus to the beamlet. It is shown that NIs extracted near the edge of the meniscus and with a large incident angle to the meniscus form a beam halo. The peak power load of e− dumped onto the grid system depends on their distribution on the meniscus, the distribution calculated using ONIX results in a higher peak load than a uniform distribution.