Study of density fluctuation during low hybrid current drive on HT-7 tokamak

• DOI: 10.1016/j.physleta.2010.07.002
• Publication Date: 2010-07-06T08:28:41Z
• Authors: W.Y. Zhang; Y.D. Li; X. Gao; S.Y. Lin; Q. Zang; Y.X. Jie; X.D. Zhang; J. Li
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract An experimental study of medium and high-k density fluctuations has been performed during low hybrid current drive (LHCD) in the HT-7 tokamak. Two series of plasma discharges in different plasma current with a limiter configuration were conducted in which the injected LHW power was gradually increased. The fluctuation level of the mode in channel k θ = 12 cm − 1 and k θ = 20 cm − 1 is related to the q profile, and the normalized frequency spectrum is found to be independent of the LHW power.