文献类型：期刊文献

英文题名：Heat transport analysis of the improved confinement discharge with LHW in the HT-7 tokamak

作者：Zhang, X. M.[1];Shen, X.[1];Wan, B. N.[2];Wu, Z. W.[2];Fu, J.[2]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China

年份：2010

卷号：76

期号：2

起止页码：229

外文期刊名：JOURNAL OF PLASMA PHYSICS

收录：;EI(收录号：20101712872736);WOS:【SCI-EXPANDED(收录号:WOS:000276169600008)】；

基金：This work was supported by the National Natural Science Foundation of China under Grant No. 10505008 and the program of the Ministry of Science and Technology of China (No. 2009GB105002).

语种：英文

外文关键词：Heat transfer - Electron temperature - Magnetoplasma - Electric discharges - Tokamak devices - Wave power

摘要：In the HT-7 tokamak, heat transport analysis is carried out for the lower hybrid current drive (LHCD) experiments. Electrons and ions are coupled and good confinement can be obtained by properly optimizating LHCD and plasma parameters. Under the conditions that the plasma current is about 220 kA, the lower hybrid wave (LHW) power is about 300 kW and the central line-averaged density is about 1.5 x 10(13) cm(-3). lower hybrid wave power deposition is off-axis. Local transport analysis illustrated that both electron and ion thermal diffusivities are decreased during the :LHW phase, and the electron internal transport barriers (eITBs) are formed while been accompanied by the ion internal transport barriers (iITBs) during LHW phase. Ions are heated by electron-ion collision in the region of the barriers although the ohmic power and the LHW power were absorbed by the electrons. Both electron temperature and ion temperature are increased during the LHW phase. and in the confinement, region, the electron-to-ion temperature ratio. T(e)/T(i) varies from 2.0 similar to 2.5 during OH phase to 1.3 similar to 1.6 during LHW injected into the plasma, which shows that electron confinement is not degraded by the electron ion collisions meanwhile ions are also confined. The energy confinement is increased from 13 ms to 25 ms due to the formation of electron and ion internal transport harries after the LHW is injected into the plasma. LHW driven current and bootstrap current contribute to 60% of the total current.