Conveners
Turbulence, Zonal Flows & GAMs: EX/10 & TH/8
- Boyd Blackwell (Australia)
Mr
Shigeru Inagaki
(Japan)
13/10/2012, 08:30
EXC - Magnetic Confinement Experiments: Confinement
Oral Presentation
Here we report dynamic response of micro-fluctuations and turbulent flux to a low frequency heat wave induced by the ECH modulation and development of observation of low frequency fluctuation with long distance radial correlation length comparable to the plasma radius (long-range mode) in LHD. A low frequency global wave is excited by central ECH power modulation at 25 Hz. The typical...
Ms
Teresa Estrada
(Spain)
13/10/2012, 08:50
EXC - Magnetic Confinement Experiments: Confinement
Oral Presentation
The spatiotemporal behaviour of the interaction between turbulence and flows has been studied close to the L-H transition threshold conditions in the edge region of TJ-II plasmas. The temporal dynamics of the interaction displays an oscillatory behaviour with a characteristic predator-prey relationship. This intermediate oscillatory transient stage has been seen in L-H transition experiments...
Mr
Tomo-Hiko Watanabe
(Japan)
13/10/2012, 09:10
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral Presentation
Turbulence spectra and transport in helical plasmas are investigated by the gyrokinetic simulations of ion temperature gradient (ITG) turbulence interacting with microscopic ExB zonal flows (ZFs) and by the neoclassical transport analysis of macroscopic ExB flows. Our recent kinetic simulations enable us quantitative evaluation of the turbulent transport level and the macroscopic radial...
Mr
Gary M. Staebler
(USA)
13/10/2012, 09:30
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral Presentation
The toroidal Reynolds stress due to the shear in the ExB velocity Doppler shift acts like a momentum pinch [1] against the parallel velocity shear contribution to the stress. This momentum pinch cannot be computed with the quench rule paradigm [2]. This is because the quench rule only reduces the amplitude of the turbulence and does break the parity of the linear eigenfunctions [1]. Detailed...
Mr
George TYNAN
(USA)
13/10/2012, 09:50
EXC - Magnetic Confinement Experiments: Confinement
Oral Presentation
The kinetic energy transfer between shear flows and the ambient turbulence is measured for the first time in the EAST, DIII-D and HL-2A tokamaks. In EAST as the plasma is heated and approaches the L-H transition, the rate of energy transfer from the turbulence into the zonal flow increases. Finally, when this rate becomes comparable to the energy input rate into the turbulence, the...
