The discrete Alfvén wave spectrum observed in the TORTUS tokamak

Miljak, D.G.; Cross, Rod

doi:10.1088/0741-3335/38/2/007

Cited by 2 publications

(1 citation statement)

References 19 publications

(29 reference statements)

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“…GAEs have been studied theoretically [21,22] and experimentally [23,24]. They are found to be strongly continuum damped in tokamaks because of coupling to the Alfvén continuum wave, due to toroidal effects.…”

Section: Multiple Gae Spectrummentioning

confidence: 99%

Dependence of the MHD spectrum on the safety factor profile

Holties¹,

Goedbloed²,

Huysmans³

et al. 1997

Plasma Phys. Control. Fusion

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We investigate the effect of the shape of the safety factor profile on the MHD spectrum. Results from numerical simulations with the CASTOR code are presented. Two scenarios are discussed. Firstly, finite beta plasmas with a non-monotonic safety factor profile for which it will be shown that a cluster spectrum of global Alfvén waves can exist. When these modes appear in the frequency range of the toroidicity-induced Alfvén gap they are undamped and become susceptible to excitation by, for example, an external antenna. The second scenario is that of small aspect ratio plasmas with a region of low shear. In these plasmas a multiple spectrum of TAE modes is shown to occur. We show a simulation of a plasma applicable to the proposed USTX experiment. The relevance to fusion experiments, in particular in the context of MHD spectroscopy, are discussed.

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Section: Multiple Gae Spectrummentioning

confidence: 99%

Dependence of the MHD spectrum on the safety factor profile

Holties¹,

Goedbloed²,

Huysmans³

et al. 1997

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

Probe wave system for studying excitation of Alfvén eigenmodes in the ion cyclotron range of frequency

Ichimura

Ohta

Motegi

et al. 2001

Review of Scientific Instruments

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A probe wave system was constructed for studying the excitation of the Alfvén ion cyclotron ͑AIC͒ modes in the anchor cell of the GAMMA 10 tandem mirror. In the central cell, the AIC modes are spontaneously excited as axial eigenmodes due to the strong temperature anisotropy. In the anchor cell, the AIC modes were not observed though the anisotropy is the same as in the central cell. The axial profiles of the magnetic field strength and plasma parameters in the anchor cell are different from those in the central cell. Eigenmodes are excited externally in the AIC frequency range by injecting probe waves. This suggests the AIC modes are unstable in the anchor cell and grow to the detectable level when boundary conditions are realized.

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The discrete Alfvén wave spectrum observed in the TORTUS tokamak

Cited by 2 publications

References 19 publications

Dependence of the MHD spectrum on the safety factor profile

Dependence of the MHD spectrum on the safety factor profile

Probe wave system for studying excitation of Alfvén eigenmodes in the ion cyclotron range of frequency

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