Peer-Reviewed Journal Details
Mandatory Fields
RenÚ Reimer, Andreas Dinklage, Robert Wolf, Mike Dunne, Benedikt Geiger, J÷rg Hobirk, Matthias Reich, ASDEX Upgrade Team and Patrick J. Mc Carthy
2017
April
Nuclear Fusion
Investigation of fast ion pressure effects in ASDEX Upgrade by spectral MSE measurements
Published
WOS: 7 ()
Optional Fields
motional Stark effect, combined Zeeman and motional stark effect, beam emission spectroscopy, magnetic field measurements, magnetically confined plasmas, plasma diamagnetism, fast ions in tokamaks
57
4
046005
High precision measurements of fast ion effects on the magnetic equilibrium in the ASDEX Upgrade tokamak have been conducted in a high-power (10 MW) neutral-beam injection discharge. An improved analysis of the spectral motional Stark effect data based on forward-modeling, including the Zeeman effect, fine-structure and non-statistical sub-level distribution, revealed changes in the order of 1% in B. The results were found to be consistent with results from the equilibrium solver CLISTE. The measurements allowed us to derive the fast ion pressure fraction to be $ \Delta {{p}_{\text{FI}}}/{{p}_{\text{mhd}}}\approx 10 \% $ and variations of the fast ion pressure are consistent with calculations of the transport code TRANSP. The results advance the understanding of fast ion confinement and magneto-hydrodynamic stability in the presence of fast ions.
10.1088/1741-4326/aa5877
Grant Details