Numerical study on wave-induced beam ion prompt losses in DIII-D tokamak

A numerical study is performed on the coherent beam ion prompt losses driven by Alfvén eigenmodes (AEs) in DIII-D plasmas using realistic parameters and beam ion deposition profiles. The synthetic signal of a fast-ion loss detector (FILD) is calculated for a single AE mode. The first harmonic of the...

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Bibliographic Details
Published in:Physics of plasmas 2017-08, Vol.24 (8)
Main Authors: Feng, Zhichen, Zhu, Jia, Fu, Guo-Yong, Heidbrink, W. W., Van Zeeland, M. A.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Amplitudes
Plasma physics
Plasmas (physics)
Tokamak devices
toroidal Alfven eigenmodes
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Summary:A numerical study is performed on the coherent beam ion prompt losses driven by Alfvén eigenmodes (AEs) in DIII-D plasmas using realistic parameters and beam ion deposition profiles. The synthetic signal of a fast-ion loss detector (FILD) is calculated for a single AE mode. The first harmonic of the calculated FILD signal is linearly proportional to the AE amplitude with the same AE frequency in agreement with the experimental measurement. The calculated second harmonic is proportional to the square of the first harmonic for typical AE amplitudes. The coefficient of quadratic scaling is found to be sensitive to the AE mode width. The second part of this work considers the AE drive due to coherent prompt loss. It is shown that the loss-induced mode drive is much smaller than the previous estimate and can be ignored for mode stability.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.5000073