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6 results on '"Na DH"'

2. Intrinsic rotation reversal, non-local transport, and turbulence transition in KSTAR L-mode plasmas

Author

Shi, YJ, Kwon, JM, Diamond, PH, Ko, WH, Choi, MJ, Ko, SH, Hahn, SH, Na, DH, Leem, JE, Lee, JA, Yang, SM, Lee, KD, Joung, M, Jeong, JH, Yoo, JW, Lee, WC, Lee, JH, Bae, YS, Lee, SG, Yoon, SW, Ida, K, and Na, Y-S

Subjects
non-local transport, turbulence transition, intrinsic rotational reversal, Fluids & Plasmas, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Published
2017

3. Turbulent equipartition pinch of toroidal momentum in spherical torus

Author

Hahm, TS, Lee, J, Wang, WX, Diamond, PH, Choi, GJ, Na, DH, Na, YS, Chung, KJ, and Hwang, YS

Subjects
momentum transport, pinch, spherical torus, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

We present a new analytic expression for turbulent equipartition (TEP) pinch of toroidal angular momentum originating from magnetic field inhomogeneity of spherical torus (ST) plasmas. Starting from a conservative modern nonlinear gyrokinetic equation (Hahm et al 1988 Phys. Fluids 31 2670), we derive an expression for pinch to momentum diffusivity ratio without using a usual tokamak approximation of B∝1/R which has been previously employed for TEP momentum pinch derivation in tokamaks (Hahm et al 2007 Phys. Plasmas 14 072302). Our new formula is evaluated for model equilibria of National Spherical Torus eXperiment (NSTX) (Ono et al 2001 Nucl. Fusion 41 1435) and Versatile Experiment Spherical Torus (VEST) (Chung et al 2013 Plasma Sci. Technol. 15 244) plasmas. Our result predicts stronger inward pinch for both cases, as compared to the prediction based on the tokamak formula.

Published
2014

4. Turbulent equipartition pinch of toroidal momentum in spherical torus

Author

Hahm, TS, Lee, J, Wang, WX, Diamond, PH, Choi, GJ, Na, DH, Na, YS, Chung, KJ, and Hwang, YS

Subjects
momentum transport, pinch, spherical torus, Fluids & Plasmas, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We present a new analytic expression for turbulent equipartition (TEP) pinch of toroidal angular momentum originating from magnetic field inhomogeneity of spherical torus (ST) plasmas. Starting from a conservative modern nonlinear gyrokinetic equation (Hahm et al 1988 Phys. Fluids 31 2670), we derive an expression for pinch to momentum diffusivity ratio without using a usual tokamak approximation of B∝1/R which has been previously employed for TEP momentum pinch derivation in tokamaks (Hahm et al 2007 Phys. Plasmas 14 072302). Our new formula is evaluated for model equilibria of National Spherical Torus eXperiment (NSTX) (Ono et al 2001 Nucl. Fusion 41 1435) and Versatile Experiment Spherical Torus (VEST) (Chung et al 2013 Plasma Sci. Technol. 15 244) plasmas. Our result predicts stronger inward pinch for both cases, as compared to the prediction based on the tokamak formula.

Published
2014

5. E × B shear suppression of turbulence in diverted H-mode plasmas: role of edge magnetic shear

Author

Hahm, TS, Na, DH, Lee, JW, Park, JW, Na, YS, Kim, SS, Ko, WH, Diamond, PH, Jhang, Hogun, and Jeon, YM

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Fluids & Plasmas
Abstract

We show that strong edge magnetic shear, which is generic to divertor plasmas, makes the E × B shearing of turbulence eddys in toroidal geometry more effective. From calculations of the E × B shearing rates for KSTAR edge parameters, we conclude that the enhanced magnetic shear at the diverted KSTAR plasma edge facilitates E × B shear suppression of turbulence and ensuing H-mode transition. © 2013 IAEA, Vienna.

Published
2013

6. E × B shear suppression of turbulence in diverted H-mode plasmas: Role of edge magnetic shear

Author

Hahm, TS, Na, DH, Lee, JW, Park, JW, Na, YS, Kim, SS, Ko, WH, Diamond, PH, Jhang, H, and Jeon, YM

Subjects
Fluids & Plasmas, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We show that strong edge magnetic shear, which is generic to divertor plasmas, makes the E × B shearing of turbulence eddys in toroidal geometry more effective. From calculations of the E × B shearing rates for KSTAR edge parameters, we conclude that the enhanced magnetic shear at the diverted KSTAR plasma edge facilitates E × B shear suppression of turbulence and ensuing H-mode transition. © 2013 IAEA, Vienna.

Published
2013

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