Investigation of statistical characterization of radial turbulence in the edge of HuanLiuqi-2A plasma with visible spectroscopy diagnostic

Zhong, W. L.; Duan, X. R.; Yu, D. L.; Han, X. Y.; Cheng, J.; Ding, X. T.; Liu, Yi.; Yan, L. W.; Yang, Q. W.
November 2010
Physics of Plasmas;Nov2010, Vol. 17 Issue 11, p112307
Academic Journal
The radial motion and structure of edge turbulence in the HuanLiuqi-2A tokamak [Y. Liu et al., Nucl. Fusion 45, S239 (2005)] was measured with visible spectroscopy diagnostic system; the radial turbulence propagation velocity and correlation length were evaluated by time-delay correlation technique and there were typically Vr=0.4-1 km/s and Lr=2-6 cm, respectively. The edge intermittent events accompanied with turbulence have been observed in plasma edge and propagated outward radially; especially through the scrape-off layer, the fluctuation signals of Dα exhibit strong asymmetric probability distribution functions (PDFs). Their propagation trajectories and radial velocity PDFs were inferred from a special correlation technique and the results indicated the radial velocity of intermittent event depends on its amplitude. Some comparisons with previous measurements and models were also presented.


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