Abstract： The phenomena of improved edge confinement due to ion cyclotron radio frequency boronization were observed with a fast reciprocating Langmuir probe in the HT-7 tokamak. A strong shear layer of radial electric field was produced in the plasma edge region, which resulted in the formation of an edge transport barrier. As a consequence, the edge profiles of electron density were steepened, and both the absolute and relative fluctuation levels were suppressed by the shearing E x B flows. Concomitant reduction of the coherence between electron density and poloidal electric field fluctuations and the change of their cross-phase resulted in turbulent particle flux dropping by more than a half at the plasma edge. This demonstrates the de-correlation effect of turbulence and its contribution to edge transport. The results presented here suggest a link between wall conditions and boundary plasma physics, especially an interaction between atomic processes and turbulence through the formation of radial electric field shear at the plasma edge.
XU Guo-Sheng;WAN Bao-Nian;SONG-Mei;LING Bi-Li. Improved Edge Confinement due to Ion Cyclotron Radio Frequency Boronization in the HT-7 Tokamak[J]. 中国物理快报, 2003, 20(6): 881-884.
XU Guo-Sheng, WAN Bao-Nian, SONG-Mei, LING Bi-Li. Improved Edge Confinement due to Ion Cyclotron Radio Frequency Boronization in the HT-7 Tokamak. Chin. Phys. Lett., 2003, 20(6): 881-884.
YANG Qing-Wei;ZHOU Hang-Yu;FENG Bei-Bin;LIU Yi;PAN Yu-Dong;LI Wei;DUAN Xu-Ru;CHEN Wei;CUI Zheng-Ying;JI Xiao-Quan;DING Xuan-Tong;HL-A team. A New Criterion for Disruption Prediction on HL-2A[J]. 中国物理快报, 2006, 23(4): 891-894.
2003, Vol. 20 
