Observation of intermittency in edge plasma of SUNIST tokamak

doi:10.1088/1009-1963/13/12/020

Abstract

Abstract The temporal intermittency of the fluctuation-driven particle transport fluxes is analysed by using data obtained from Langmuir probe array in the edge of the Sino-United Spherical Tokamak (SUNIST). The conditional statistics analysis indicates that the intermittent structures have a characteristic time width of about 30μs, which is the typical fluctuation time scaling. It is also found that the transport fluxes have a multifractal character over the fluctuation time scales, and exhibit a long-time-range correlation character with self-similar parameter $H>0.5$ in the plasma confinement time scales. Furthermore, the analyses show that the level of the intermittency and the long-range correlation of the fluxes vary with increasing plasma density. These observations are consistent with the prediction of the avalanche-like model.

Keywords: intermittency spherical tokamak edge plasma turbulence transport

Received: 21 June 2004
Revised: 20 August 2004
Accepted manuscript online:

PACS:	52.40.Hf	(Plasma-material interactions; boundary layer effects)
	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.25.Fi	(Transport properties)
	52.70.Ds	(Electric and magnetic measurements)
	52.35.Ra	(Plasma turbulence)
	52.25.Gj	(Fluctuation and chaos phenomena)

Fund: Project supported by the National Natura1 Science Foundation of China (Grants Nos 10275041, 10235010 and 10375089) and by China Postdoctoral Science Foundation.

Cite this article:

Wang Wen-Hao (王文浩), He Ye-Xi (何也熙), Gao Zhe (高喆), Zeng Li (曾立), Zhang Guo-Ping (张国平), Xie Li-Feng (解丽凤), Feng Chun-Hua (冯春华) Observation of intermittency in edge plasma of SUNIST tokamak 2004 Chinese Physics 13 2091

[1]	Longitudinal and transverse structure functions in decaying nearly homogeneous and isotropic turbulence Imtiaz Ahmad, Lu Zhi-Ming (卢志明), Liu Yu-Lu (刘宇陆). Chin. Phys. B, 2014, 23(1): 014701.
[2]	Intermittency of the density fluctuations and its influence on the radial transport in the boundary of J-TEXT Zhu Meng-Zhou(朱孟周), Zhuang Ge(庄革), Wang Zhi-Jiang(王之江), and Pan Yuan(潘垣). Chin. Phys. B, 2011, 20(2): 025204.
[3]	Intermittency and bifurcation in SEPICs under voltage-mode control Liu Fang(刘芳). Chin. Phys. B, 2010, 19(8): 080511.
[4]	Circuit implementation and multiform intermittency in a hyper-chaotic model extended from the Lorenz system Cang Shi-Jian(仓诗建), Chen Zeng-Qiang(陈增强), and Wu Wen-Juan(吴文娟). Chin. Phys. B, 2009, 18(5): 1792-1800.
[5]	Generation of on--off intermittency based on Rössler chaotic system Zhou Qian(周茜), Chen Zeng-Qiang(陈增强), and Yuan Zhu-Zhi(袁著祉). Chin. Phys. B, 2007, 16(9): 2616-2626.
[6]	Evidence of intermittent fluctuation of target fragments in ⁸⁴Kr--AgBr interactions at 1.7 A GeV Zhang Dong-Hai(张东海), Li Xue-Qin(李雪琴), Jia Hui-Ming(贾会明), He Chun-Le(何春乐), Liu Fang(刘芳), Zhao Hui-Hua(赵惠华), Li Zhen-Yu(李振宇), and Li Jun-Sheng(李俊生). Chin. Phys. B, 2007, 16(9): 2683-2688.
[7]	Intermittency in 3.7 A GeV ¹⁶O-emulsion interactions Zhang Dong-Hai(张东海), Zhao Hui-Hua(赵惠华), Liu Fang(刘芳), He Chun-Le(何春乐), Jia Hui-Ming(贾会明), Li Xue-Qin(李雪琴), Li Zhen-Yu(李振宇), and Li Jun-Sheng(李俊生). Chin. Phys. B, 2007, 16(9): 2689-2700.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Metrics
Related Articles

Observation of intermittency in edge plasma of SUNIST tokamak

Cite this article:

Online attention