Dr
Katsumi Ida
(National Institute for Fusion Science)
27/10/2018, 08:30
EXC - Magnetic Confinement Experiments: Confinement
Oral
Isotope effects of the ion particle transport both for carbon impurity and bulk ions are investigated in Large Helical Device (LHD) in a condition decoupled from electron particle transport. Better particle confinement for both impurity and bulk ions are observed in deuterium plasmas than in hydrogen plasmas. The following findings are presented in this paper. 1) Carbon impurity density...
Dr
Vladimir Vershkov
(NRC "Kurchatov institute")
27/10/2018, 08:50
EXC - Magnetic Confinement Experiments: Confinement
Oral
Previous correlation reflectometry investigations in T-10 tokamak revealed the existence of several density fluctuation types and strong radial and poloidal variation of their amplitudes and correlation properties. This paper presents the new measurements of the 3D spatial distributions of the amplitudes, radial correlation lengths and long range correlations along the field lines of the...
Dr
Jae-Min Kwon
(National Fusion Research Institute)
27/10/2018, 09:10
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral
We perform gyrokinetic simulations to study the effects of a stationary magnetic island on neoclassical and turbulence physics. A KSTAR L-plasma condition is employed for the simulations. Through the simulations, we aim to understand the underlying physical mechanisms of poloidal flows and fluctuations around a stationary (2,1) magnetic island, which were observed in a recent KSTAR experiment...
Mr
Pablo Rodriguez-Fernandez
(UsPSFC)
27/10/2018, 09:30
EXC - Magnetic Confinement Experiments: Confinement
Oral
This work demonstrates that cold-pulse phenomena in tokamak plasmas can be fully explained by local transport models [1], including the existence of core temperature inversions at low density and disappearance at high density, thus resolving an enigmatic but universal transient transport phenomenon that has challenged the standard local model of transport for more than twenty years [2]. The...
Mr
Alexey Altukhov
(Ioffe Institute)
27/10/2018, 09:50
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral
The fast linear (Born approximation) version of the X-mode Doppler reflectometry (DR) synthetic diagnostics is developed in the framework of the ELMFIRE global gyrokinetic modeling of the FT-2 tokamak ohmic discharge. The DR signal frequency spectra and the dependence of their frequency shift and shape on the probing antenna position are computed and shown to be similar to those measured in...
