Observation of Toroidicity-Induced Alfv{acute e}n Eigenmodes in Ohmically Heated Plasmas by Drift Wave Excitation

Journal Article · Sat Nov 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.79.4186· OSTI ID:553135

Maraschek, M; Guenter, S; Kass, T; Scott, B; Zohm, H ^[1]

---

1. Institut fuer Plasmaforschung, Universitaet Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart (Germany)

At ASDEX Upgrade, in Ohmically heated discharges MHD modes scaling with f{approximately}B/{radical}(m{sub i}n{sub e}) have been observed, pointing towards Alfv{acute e}nic-type modes. Considering a local approximation for the frequency of toroidicity-induced Alfv{acute e}n eigenmodes (TAE-modes), a value for the localization of the modes of q{approx}2.6 results. More detailed calculations predict TAE-modes with the corresponding frequencies at this location. The excitation of TAE-modes without fast particles can be explained by the coupling of the electromagnetic part of the drift Alfv{acute e}n turbulence at the plasma edge to the ordinary Alfv{acute e}n wave spectrum. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 553135
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
EIGENFREQUENCY
ION CYCLOTRON-RESONANCE
LANDAU DAMPING
MAGNETOHYDRODYNAMICS
PLASMA DRIFT
PLASMA HEATING
SCALING