2008•Plasma Physics and Controlled FusionRequires access

Study of confinement and LHCD efficiency on the HT-7 tokamak

Xiang Gao, Qian Feng Xu, J G Li, Jiafang Shan, Liqun Hu, Jiyin Zhao, the HT-7 Team

Abstract

High power heating of a lower hybrid wave (LHW) was performed ( P LHW ∼ 800 kW at 2.45 GHz) recently in the HT-7 tokamak. Lower hybrid current drive (LHCD) efficiency is studied for different injected powers and for different densities. Improved particle confinement is observed by the application of LHCD as characterized by an increase in the central line averaged electron density and the decrease in D α emission. The particle confinement time (τ p ) increased by about 1.5 times. The dependence of energy confinement time (τ E ) on plasma density and LHW power is experimentally studied in detail.

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Key concepts: Tokamak, Plasma confinement, Magnetic confinement fusion, Nuclear engineering, Plasma, Physics, Materials science, Nuclear physics