Edge Turbulence: EX/11 & TH/8
- Yasuaki Kishimoto (Japan)
317. Experimental Turbulence Studies for Gyro-Kinetic Code Validation Using Advanced Microwave Diagnostics
Mr Ulrich Stroth (Germany)
10/18/14, 10:50 AM
Turbulent transport remains one of the most important and challenging topics in fusion research. Scientific understanding of the related physical processes can only be enhanced through a close comparison of numerical simulations with experimental data. Microwave-based diagnostics represent almost the sole experimental approach capable of capturing plasma parameter fluctuations with the...
700. The Isotope Effect in GAM – Turbulence Interplay and Anomalous Transport in Tokamak & Density Fluctuations as an Intrinsic Mechanism to Keep Self-Consistent Shape of Pressure Profile
Mr Alexey Gurchenko (Russian Federation)
10/18/14, 11:10 AM
A The interaction between large-scale mean E×B flows, geodesic acoustic modes (GAM) and small-scale drift-wave turbulence has been an important area of experimental research for anomalous transport of energy and particles in toroidal plasmas during the last decade utilizing more and more sophisticated tools. In this paper results of investigation of the interplay of GAMs and broadband drift...
Mr Jiaqi Dong (China)
10/18/14, 11:30 AM
Understanding the physics mechanism of low-high (L-H) confinement transitions in toroidal plasmas is essential for ensuring heating power requirements for future fusion reactors. Early experiments show that plasma may enter an intermediate phase (I-phase) with limit cycle oscillations (LCOs) of plasma parameters and pass through a slow L-H transition if heating power is close to the H-mode...
Mr Lothar Schmitz (USA)
10/18/14, 11:50 AM
Developing a physics-based model of the L-H transition is critical for confidently extrapolating the auxiliary heating requirements for ITER from the existing empirical L-H transition power threshold scaling. For the first time, it is shown here that the initial turbulence collapse preceding the L-H transition is caused by turbulence-generated (positive) E×B flow opposing the equilibrium...
Mr Gunyoung Park (Republic of Korea)
10/18/14, 12:10 PM
High confinement mode (H-mode) is essential as a baseline operating scenario in ITER. In order to develop a predictive model of the power threshold for access to H-mode in ITER, it is essential to understand first the underlying mechanism that triggers the transition. It is widely accepted that edge transport barrier (ETB) formation in H-mode is due to the suppression of turbulence by E x B...