Conveners
Turbulence & Transport: EX/8 & TH/6
- Gary M. Staebler (General Atomics)
Dr
Maiko Yoshida
(Japan Atomic Energy Agency)
10/21/16, 10:45 AM
EXC - Magnetic Confinement Experiments: Confinement
Oral
Negative magnetic shear has been demonstrated to mitigate the confinement degradation typically observed with increasing the electron to ion temperature ratio (Te/Ti), and the mechanisms are now understood in terms of fluctuation measurements and gyrokinetic (GK) simulations in DIII-D steady-state plasmas. The impact of Te/Ti on plasma transport and confinement is a critical issue for ITER and...
Dr
Christopher Holland
(University of California San Diego)
10/21/16, 11:05 AM
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral
New experimentally validated simulations demonstrate for the first time that the turbulent transport that sets tokamak confinement is robustly multiscale across a variety of reactor-relevant regimes, with significant nonlinear cross-scale couplings that must be accurately described to correctly predict ITER performance. These gyrokinetic and gyrofluid simulations of electron transport...
Dr
Akihiro Ishizawa
(Kyoto University)
10/21/16, 11:25 AM
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral
As a trial in evaluating helical system designed with different concepts, we have compared two devices, the Large Helical Device (LHD) and the Heliotron J (HJ), with different magnetic field structure under two key parameters, i.e. the Mercier/interchange measure D_well and the magnetic shear s_hat, focusing on their linear drift wave instability and nonlinear evolution leading to turbulent...
Dr
Jeronimo Garcia
(CEA IRFM)
10/21/16, 11:45 AM
THC - Magnetic Confinement Theory and Modelling: Confinement
Oral
The thermal energy confinement time has been observed to largely vary with the exchange of the main isotope in broad experimental conditions in magnetically confined plasmas, leading to the so called isotope effect. Of particular interest is the isotope exchange between the fusion of deuterium-deuterium (DD) and deuterium-tritium (DT) nuclei, studied in dedicated experiments performed in the...
Dr
Deliang Yu
(CnSWIP)
10/21/16, 12:05 PM
EXC - Magnetic Confinement Experiments: Confinement
Oral
Ion internal transport barriers (iITBs) are first observed in neutral beam injection (NBI) heated plasmas at the HL-2A tokamak. The position of the barrier foot, in the stationary state, coincides with the $q = 1$ surface within its uncertainty of measurement. iITBs can develop more easily at the beginning of NBI heating. Also, iITBs are unstable for the sawtooth plasma. Simulations reveal...
