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Title: Simulation Study of Current Drive Efficiency for KSTAR 5 GHz LHCD

Abstract

Theoretical 5 GHz lower hybrid current drive (LHCD) efficiency using power spectrum given by 0-D Brambilla code and Lower Hybrid Simulation Code (LSC) have been studied for KSTAR. In LSC simulation, RF-driven current and current drive efficiency has been found to be deeply dependent on the profiles of the plasma density and temperature as well as on current profile in order to obtain hollow current profile favorable for advance tokamak operation mode and steady state operation. The peaked density and broad temperature profile control has been found to be efficient in current drive with maximum RF-driven current larger than 400 kA/MW with very high efficiency when the peak plasma density is ranged from 0.2 to 2.0x1020 m-3, and the peak electron temperature range of 2-20 keV together with toroidal field 2-3.5 T and Ip = 0.5-2 MA. The on-/off-axis current profile controllability is also investigated through parametric scan, and small negative magnetic shear is seen at the narrow region of the off-axis for very high temperature regime and for high BT and I{sub p}. In order to achieve the same for lower temperature regime Ip has to be lower and also for higher LH-power compromising with CD efficiency in thismore » case.« less

Authors:
; ; ;  [1]; ; ; ;  [2]
  1. National Fusion Research Institute, Gwahangno 113, Yuseong-gu, Daejeon 305-333 (Korea, Republic of)
  2. Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
21612513
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1406; Journal Issue: 1; Conference: 9. topical conference on radio frequency power in plasmas, Newport (United States), 1-3 Jun 2011; Other Information: DOI: 10.1063/1.3665009; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPUTERIZED SIMULATION; CONTROL; EFFICIENCY; ELECTRIC CURRENTS; ELECTRON TEMPERATURE; GHZ RANGE; KEV RANGE; LOWER HYBRID CURRENT DRIVE; LOWER HYBRID HEATING; PLASMA; PLASMA CONFINEMENT; PLASMA DENSITY; PLASMA SIMULATION; SHEAR; STEADY-STATE CONDITIONS; TOKAMAK DEVICES; WAVEGUIDES; CLOSED PLASMA DEVICES; CONFINEMENT; CURRENTS; ENERGY RANGE; FREQUENCY RANGE; HEATING; HIGH-FREQUENCY HEATING; NON-INDUCTIVE CURRENT DRIVE; PLASMA HEATING; SIMULATION; THERMONUCLEAR DEVICES

Citation Formats

Aria, A K, Bae, Y S, Yang, H L, Kwon, M, Do, H J, Namkung, W, Cho, M H, and Park, H. Simulation Study of Current Drive Efficiency for KSTAR 5 GHz LHCD. United States: N. p., 2011. Web. doi:10.1063/1.3665009.
Aria, A K, Bae, Y S, Yang, H L, Kwon, M, Do, H J, Namkung, W, Cho, M H, & Park, H. Simulation Study of Current Drive Efficiency for KSTAR 5 GHz LHCD. United States. doi:10.1063/1.3665009.
Aria, A K, Bae, Y S, Yang, H L, Kwon, M, Do, H J, Namkung, W, Cho, M H, and Park, H. Fri . "Simulation Study of Current Drive Efficiency for KSTAR 5 GHz LHCD". United States. doi:10.1063/1.3665009.
@article{osti_21612513,
title = {Simulation Study of Current Drive Efficiency for KSTAR 5 GHz LHCD},
author = {Aria, A K and Bae, Y S and Yang, H L and Kwon, M and Do, H J and Namkung, W and Cho, M H and Park, H},
abstractNote = {Theoretical 5 GHz lower hybrid current drive (LHCD) efficiency using power spectrum given by 0-D Brambilla code and Lower Hybrid Simulation Code (LSC) have been studied for KSTAR. In LSC simulation, RF-driven current and current drive efficiency has been found to be deeply dependent on the profiles of the plasma density and temperature as well as on current profile in order to obtain hollow current profile favorable for advance tokamak operation mode and steady state operation. The peaked density and broad temperature profile control has been found to be efficient in current drive with maximum RF-driven current larger than 400 kA/MW with very high efficiency when the peak plasma density is ranged from 0.2 to 2.0x1020 m-3, and the peak electron temperature range of 2-20 keV together with toroidal field 2-3.5 T and Ip = 0.5-2 MA. The on-/off-axis current profile controllability is also investigated through parametric scan, and small negative magnetic shear is seen at the narrow region of the off-axis for very high temperature regime and for high BT and I{sub p}. In order to achieve the same for lower temperature regime Ip has to be lower and also for higher LH-power compromising with CD efficiency in this case.},
doi = {10.1063/1.3665009},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1406,
place = {United States},
year = {2011},
month = {12}
}