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P: Fachverband Plasmaphysik
P 14: Magnetic Confinement V
P 14.3: Vortrag
Donnerstag, 19. März 2026, 11:50–12:05, KH 02.016
Characterization of Neutral Helium Beam Injection at ASDEX Upgrade — •Manuel Matsumoto1,2, Athina Kappatou2, Lucía Sanchis3, Michael Dunne2, Christian Hopf2, Thomas Pütterich2, Gregor Birkenmeier1,2, Rachael M McDermott2, and ASDEX Upgrade Team2 — 1Technical University of Munich, Germany — 2Max Planck Institute for Plasma Physics, Garching, Germany — 3University of Sevilla, Spain
The confinement and slowing-down behaviour of energetic alpha particles are critical for the performance of future reactors, as they are expected to heat the background plasma. Pulses with helium neutral beam injection (NBI) have been carried out at ASDEX Upgrade to produce an energetic helium population. Charge Exchange Recombination Spectroscopy (CXRS) measurements reveal a slowing down feature characteristic of the fast helium ion population.
To interpret the measurements, an ASCOT5 based particle tracking model is used to describe the helium beam ionization and slowing-down process in a fusion plasma. A forward model allows direct comparison between experimental CXRS spectra and synthetic spectra generated from ASCOT5 distribution functions. This approach allows the interpretation of the CXRS measurements, and the validation of the ASCOT5 model itself against the measurements.
Additionally, an analysis of the beam emission components of the measured spectra allows for a detailed characterisation of the helium neutral beam and its attenuation. The results quantify the impact of metastable populations in reproducing the CXRS spectra.
Keywords: Helium Neutral Beam Injection; CXRS; ASCOT5; Beam Emission