Observation of modes in the sub-cyclotronic range of frequencies in JET

The excitation of modes in the JET tokamak in the sub-cyclotronic range of frequencies (frequencies comprised between the Alfvén frequency and the cyclotron frequency) is for the first time reported. The modes were identified as compressional Alfvén eigenmodes and have characteristics similar to tho...

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Bibliographic Details
Published in:Nuclear Fusion
Main Authors: F. Nabais, D. Borba, R. Coelho, J. Ferreira, A. Figueiredo, P. Rodrigues, S.E. Sharapov, JET Contributors
Format: Article
Language:English
Published: IOP Publishing 2024-01-01
Subjects:
tokamaks
energetic ions
compressional Alfvén eigenmodes
ICRH
Alfvén eigenmodes
Online Access:https://doi.org/10.1088/1741-4326/ad556e
Description
Summary:The excitation of modes in the JET tokamak in the sub-cyclotronic range of frequencies (frequencies comprised between the Alfvén frequency and the cyclotron frequency) is for the first time reported. The modes were identified as compressional Alfvén eigenmodes and have characteristics similar to those of the sub-cyclotronic modes observed in other tokamaks, in particular those first reported in the NSTX tokamak. On the other hand, the modes observed in JET present some unique features and were observed to be excited by ion cyclotron resonance heating instead of by the injection of beams (neutral beam injection).
ISSN:0029-5515

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