Analysis of sawtooth collapse time using electron cyclotron emission imaging on EAST tokamak

作者：Zhao, Zhenling; Xie, Jinlin^*; Qu, Chengming; Liao, Wang; Li, Hong; Lan, Tao; Liu, Adi; Zhuang, Ge; Liu, Wandong

来源：Radiation Effects and Defects in Solids-Incorporating Plasma Science and Plasma Technology, 2017, 172(9-10): 760-767.

DOI：10.1080/10420150.2017.1398751

• ECEI
• EAST tokamak
• sawtooth instability
• collapse time
• heat flux

Electron cyclotron emission imaging (ECEI), as an advanced diagnostic, provides two-dimensional (2D) images of electron temperature fluctuation in the core plasma region. The ECEI system on Experimental Advanced Superconducting Tokamak (EAST) tokamak consists of 384 channels by 24 (vertical) x 16 (horizontal). The system nearly covers the whole q = 1 surface in cross-section of EAST. Here, we present a quantitative method to estimate the sawtooth collapse time. All of the electron temperature fluctuations inside the q = 1 surface are summed up, and the collapse time is estimated as the time lag between the maximum and minimum values of the total fluctuation during one sawtooth cycle. Using this method, statistical analysis of sawtooth behaviors is studied in the EAST Ohmic heating plasma. Relationships of heat flux, sawtooth period and collapse time are also presented.

• 出版日期2017
• 单位中国科学技术大学