25th IAEA Fusion Energy Conference - IAEA CN-221

Session

Core Turbulence

EX-TH

Oct 15, 2014, 10:45 AM

Blue 1-5 (Hotel Park Inn Pribaltiyskaya)

Conveners

Core Turbulence: EX/2 & TH/1

• Evgeniy Gusakov (Russian Federation)

237. Dynamic Method to Study Turbulence and Turbulence Transport

Mr Shigeru Inagaki (Japan)

10/15/14, 10:45 AM

Oral

Here we developed research methods of plasma turbulence transport associated with the non-local features. The ECH modulation experiment and the higher harmonic analysis of the heat wave indicated: (i) propagation of the change of Te at the time of switch-off/on of ECH power is about 5 times faster than that of perturbation itself, (ii) propagation of the higher (7th) harmonic of the Te...

522. Turbulence Behavior and Transport Response Approaching Burning Plasma Relevant Parameters

Mr George R. McKee (USA)

10/15/14, 11:05 AM

Oral

Multi-scale turbulence properties are significantly altered and typically exhibit increased amplitude in high-beta inductive plasmas as parameters approach those anticipated in burning plasmas. These increases, observed with multiple fluctuation diagnostics in high performance H-mode plasmas on DIII-D, explain the consequent local transport and global energy time confinement response. Burning...

225. Multi-Scale ITG/TEM/ETG Turbulence Simulations with Real Mass Ratio and Beta Value

Mr Shinya Maeyama (Japan)

10/15/14, 11:25 AM

Oral

Understanding electron heat transport is one of the critical issues in ITER. Although electron temperature gradient (ETG) driven turbulence has been regarded as a candidate of electron heat transport, recent multi-scale plasma turbulence simulations have reported that ion-scale instabilities such as ion temperature gradient modes (ITGs) and trapped electron modes (TEMs) dominate heat transport...

656. Controlling H-Mode Particle Transport with Modulated Electron Heating in DIII-D and Alcator C-Mod via TEM Turbulence

Mr Darin Ernst (USA)

10/15/14, 11:45 AM

Oral

This work develops a quantitative understanding of the mechanisms for increased particle transport with electron heating in (quiescent) H-mode plasmas. Our DIII-D experiments demonstrate that H-mode core particle transport and density peaking can be locally controlled by modulated electron cyclotron heating (ECH). GYRO simulations show density gradient driven trapped electron modes (TEM) are...

695. Advances in Stellarator Gyrokinetics

Mr Per Helander (Germany)

10/15/14, 12:05 PM

Oral

We summarise a number of recent advances in gyrokinetic theory and simulations of microinstabilities and turbulence in stellarators, and compare with tokamaks. Trapped-electron modes (TEMs) can be very different in different types of devices, because these instabilities are excited by trapped electrons in regions of unfavourable magnetic curvature. Tokamaks and stellarators are...