Poloidal mode structure of long-distance correlation of fluctuations under strong ExB shear in the torsatron TJ-K
- Institut fuer Plasmaforschung, Universitaet Stuttgart, D-70569 Stuttgart (Germany)
Long-distance correlations of density and potential fluctuations are investigated on the poloidal circumference of flux surface in the TJ-K plasmas. Shear flow as induced by biasing causes a strong increase in the long-distance correlation of potential and density fluctuations. In the potential fluctuations, zonal-flow-like modes are excited. The density long-distance correlation is dominated by an m=3 mode. As a new feature a coherency analysis reveals also the existence of m=0 density fluctuations. As an explanation, background profile fluctuations or a turbulent zonal density drive are proposed.
- OSTI ID:
- 21276988
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 16; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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