24th IAEA Fusion Energy Conference - IAEA CN-197

Session

Turbulence, Innovative Confinement Concepts & ELMs

EX/ICC

13 Oct 2012, 10:45

Conveners

Turbulence, Innovative Confinement Concepts & ELMs: EX/11 & ICC/1

• Julio Herrera-Velázquez (Mexico)

352. EX/11-1: Evidence of Zonal-Flow-Driven Limit-Cycle Oscillations during L-H Transition and at H-mode Pedestal of a New Small-ELM Regime in EAST

Mr Guosheng Xu (China)

13/10/2012, 10:45

EXC - Magnetic Confinement Experiments: Confinement

Oral Presentation

Small-amplitude edge localized oscillations have been observed, for the first time, in EAST preceding the L-H transition at marginal input power, which manifest themselves as dithering in the divertor Dalpha signals at a frequency under 4 kHz, much lower than the GAM frequency. Detailed measurements using two toroidally separated reciprocating probes inside the separatrix demonstrate a...

661. ICC/1-1Ra & ICC/1-1Rb: Progress on HIT-SI and Imposed Dynamo Current Drive; Flow and Magnetic Field Profiles in the HIST Spherical Torus Plasmas Sustained by Double Pulsing Coaxial Helicity Injection

Mr Thomas Jarboe (USA)

13/10/2012, 11:05

ICC - Innovative Confinement Concepts

Oral Presentation

ICC/1-1Ra: Progress on HIT-SI and Imposed Dynamo Current Drive Efficient current drive and profile control are primary goals of the Helicity Injected Torus (HIT) current drive program. With the achievement of greatly improved parameters on HIT-SI came the discovery of Imposed Dynamo Current Drive (IDCD) a method of efficiently sustaining a stable equilibrium with the possibility of current...

89. EX/11-2: The Nearly Continuous Improvement of Discharge Characteristics and Edge Stability with Increasing Lithium Coatings in NSTX

Mr Rajesh Maingi (USA)

13/10/2012, 11:25

EXD - Magnetic Confinement Experiments: Plasma–material interactions; divertors; limiters; scrape-off layer (SOL)

Oral Presentation

The understanding of regimes with 1) high pressure at the top of the H-mode pedestal, and 2) devoid of large ELMs is important for scenario optimization of ITER and future devices. Lithium wall coatings have been shown to both improve energy confinement and eliminate ELMs in NSTX. Here, we present analysis of variable pre-discharge lithium evaporation from multiple experiments, for more...

430. EX/11-3: Visualization of ELM Dynamics and its Response from External Perturbations via 2D Electron Cyclotron Emission Imaging in KSTAR

Mr Hyeon Keo PARK (Republic of Korea)

13/10/2012, 11:45

EXS - Magnetic Confinement Experiments: Stability

Oral Presentation

The nature of the Edge Localized Mode (ELM) in the H-mode regime in toroidal plasmas is complex and therefore requires advanced diagnostic tools in order to enhance the understanding of the physical dynamics. It is particularly important to find a comprehensive way to eliminate or suppress this instability which is a critical issue for H-mode operation in ITER and DEMO. There have been...

248. EX/11-4: Improved Understanding of Physics Processes in Pedestal Structure, Leading to Improved Predictive Capability for ITER

Mr Richard J. Groebner (USA)

13/10/2012, 12:05

EXC - Magnetic Confinement Experiments: Confinement

Oral Presentation

Joint experiment/theory/modeling research has led to increased confidence in predictions of the pedestal height in ITER. This work was performed as part of a US DOE Joint Research Target in FY2011 to identify physics processes to control the H mode pedestal structure. This work included experiments on C-Mod, DIII-D and NSTX as well as interpretation of experimental data with theory-based...