Erlangen 2026 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.10: Poster

Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal

RF resolved measurements of the plasma and beam properties in ion sources for the ITER NBI — •Jasper Knaack, Christian Wimmer, Araceli Navarro, and Ursel Fantz — Max Planck Institute for Plasma Physics, Boltzmannstraße 2, Garching bei München, Germany

The neutral beam injectors (NBI) for ITER will require powerful negative ion sources. In such a device, a plasma is ignited in a set of cylindrical drivers. The negative ions are then generated by surface production. Part of the ITER NBI design is the use of RF plasma drivers. The frequency of the RF power that is injected into the driver is 1 MHz. The plasma parameters, such as the plasma potential, of an RF plasma can strongly vary during an RF cycle. Predictions drawn from numerical simulations have also shown large electron flux oscillations in the RF timescale. It is not known how these variations in the plasma parameters influence the extraction of negatively charged particles and thus the beam properties on the RF timescale. In order to study the oscillations in the plasma parameters, diagnostics will be implemented at the Batman UpGrade (BUG) testbed to measure the plasma parameters in an RF-resolved manner. First tests with an avalanche photo-diode have proved to be successful. Moreover, high-speed beam diagnostics will be implemented to study the effect of these plasma parameter variations on the resulting beam. This contribution discusses the planned diagnostics to be implemented in BUG.

Keywords: Neutral beam injection; Negative ion sources; RF plasma