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The toroidicity-induced Alfven eigenmode structure in DIII-D: Implications of soft x-ray and beam-ion loss data
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2001 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 8, no 7, 3391-3401 p.Article in journal (Refereed) Published
Abstract [en]

The internal structure of the toroidicity-induced Alfven eigenmode (TAE) is studied by comparing soft x-ray profile and beam ion loss data taken during TAE activity in the DIII-D tokamak [W. W. Heidbrink , Nucl. Fusion 37, 1411 (1997)] with predictions from theories based on ideal magnetohydrodynamic (MHD), gyrofluid, and gyrokinetic models. The soft x-ray measurements indicate a centrally peaked eigenfunction, a feature which is closest to the gyrokinetic model's prediction. The beam ion losses are simulated using a guiding center code. In the simulations, the TAE eigenfunction calculated using the ideal MHD model acts as a perturbation to the equilibrium field. The predicted beam ion losses are an order of magnitude less than the observed similar to6%-8% losses at the peak experimental amplitude of deltaB(r)/B(0)similar or equal to2-5x10(-4).

Place, publisher, year, edition, pages
2001. Vol. 8, no 7, 3391-3401 p.
Keyword [en]
joint european torus, energetic particle-transport, deuterium-tritium plasmas, fusion test reactor, neutral beam, d tokamak, driven instabilities, modes, stability, tftr
Identifiers
URN: urn:nbn:se:kth:diva-20743ISI: 000169525800031OAI: oai:DiVA.org:kth-20743DiVA: diva2:339440
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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