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Observations of toroidicity-induced Alfven eigenmodes in a reversed field pinch plasma
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.
Vise andre og tillknytning
2005 (engelsk)Inngår i: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 12, nr 4Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

High frequency peaks in the spectra of magnetic field signals have been detected at the edge of Extrap-T2R [P. R. Brunsell, H. Bergshker, M. Cecconello, J. R. Drake, R. M. Gravestijn, A. Hedqvist, and J-A. Malmberg, Plasma Phys. Controlled Fusion, 43, 1457 (2001)]. The measured fluctuation is found to be mainly polarized along the toroidal direction, with high toroidal periodicity n and Alfvenic scaling (f proportional to B / root m(i)n(i)). Calculations for, a reversed field pinch plasma predict the existence of an edge resonant, high frequency, high-n number toroidicity-induced Alfven eigenmode with the,observed frequency scaling. In addition, gas puffing experiments show that edge density fluctuations are responsible for the rapid. changes of mode frequency. Finally a coupling with the electron drift turbulence is proposed as drive mechanism for the eigenmode.

sted, utgiver, år, opplag, sider
2005. Vol. 12, nr 4
Emneord [en]
tokamaks, mode, excitation, turbulence, particles, transport, rotation, spectra
Identifikatorer
URN: urn:nbn:se:kth:diva-14723DOI: 10.1063/1.1861896ISI: 000228865900030Scopus ID: 2-s2.0-20844463454OAI: oai:DiVA.org:kth-14723DiVA, id: diva2:332764
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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