Behaviors of Electron Heat Transportation in HT-7 Sawtoothing Plasma  

作　　者：胡立群 许祎 万宝年 石跃江 甄香君 陈忠勇 林士耀 HT-7 Team 

机构地区：[1]Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031,China

出　　处：《Plasma Science and Technology》2005年第2期2709-2712,共4页等离子体科学和技术（英文版）

基　　金：The project supported by National Natural Science Foundation (Nos. 10375070, 10305012)and also supported partially by the core university program between China and Japan

摘　　要：It is found that in HT-7 ohmic plasma, main energy loss comes from electron heat conduction, hence quantitative data of electron heat diffusivity is a very important issue for investigation of electron heat transportation behavior in different target plasmas so as to get high performance plasma. A time-to-peak method of the heat pulse propagation originating from the sawtooth activity on the soft x-ray intensity signal has been adopted to experimentally determine electron heat diffusivity XeHP on the HT-7 tokamak. Aiming to improve the signal-to-noise (S/N) ratio of the original signal to get a stable and reasonable electron heat diffusivity XeHD value, some data processing methods, including average of tens of sawteeth, is discussed. The electron heat diffusivity XeHP is larger than XePB which is determined from the balance of background plasma power. Based on variation of the measured electron heat diffusivity XeHP, performances of different high confinement plasmas are analyzed.It is found that in HT-7 ohmic plasma, main energy loss comes from electron heat conduction, hence quantitative data of electron heat diffusivity is a very important issue for investigation of electron heat transportation behavior in different target plasmas so as to get high performance plasma. A time-to-peak method of the heat pulse propagation originating from the sawtooth activity on the soft x-ray intensity signal has been adopted to experimentally determine electron heat diffusivity XeHP on the HT-7 tokamak. Aiming to improve the signal-to-noise (S/N) ratio of the original signal to get a stable and reasonable electron heat diffusivity XeHD value, some data processing methods, including average of tens of sawteeth, is discussed. The electron heat diffusivity XeHP is larger than XePB which is determined from the balance of background plasma power. Based on variation of the measured electron heat diffusivity XeHP, performances of different high confinement plasmas are analyzed.

关 键 词：electron heat diffusivity heat pulse propagation tokamak plasma 

分 类 号：O441.1[理学—电磁学]