Experimental progress of lower hybrid current drive （LHCD） and ion Bernstein wave （IBW） heating was achieved significantly in HT-7. Long pulse plasmas, up to 400 s, were obtained by LHCD. High power lower hybrid w...Experimental progress of lower hybrid current drive （LHCD） and ion Bernstein wave （IBW） heating was achieved significantly in HT-7. Long pulse plasmas, up to 400 s, were obtained by LHCD. High power lower hybrid wave （LHW）, with PLHW of 800 kW at 2.45 GHz, was launched and the current drive efficiency was studied for different wave powers. Electron temperature and Zeff were measured in LHCD discharges. Heating experiment and recent results of high power ion Bernstein wave, with PIBW of 600 kW at 27 MHz, were summarized.展开更多
In this paper a simple code has been developed to analyze power balance and qualitatively evaluate current profiles for discharges with lower hybrid current drive （LHCD） and ion Bernstein wave （IBW） heating in the...In this paper a simple code has been developed to analyze power balance and qualitatively evaluate current profiles for discharges with lower hybrid current drive （LHCD） and ion Bernstein wave （IBW） heating in the HT-7 tokamak. Electron and ion thermal diffusivity, profiles of the bootstrap current density and total plasma current density can be estimated by this code using the experimental data. This code offers an easy and reasonable means to understand plasma transport in HT-7.展开更多
Simulation on the heating scenarios in experimental advanced superconducting tokamak （EAST） was performed by using a full wave code TORIC. The locations of resonance layers for these heating schemes are predicted an...Simulation on the heating scenarios in experimental advanced superconducting tokamak （EAST） was performed by using a full wave code TORIC. The locations of resonance layers for these heating schemes are predicted and the simulations for different schemes in ICRF experiments in EAST, for example, ion heating （both fundamental and harmonic frequency） or electron heating （by direct fast waves or by mode conversion waves）, on-axis or off-axis heating, and high- field-side （HFS） launching or low-field-side （LFS） launching, etc, were conducted. For the on-axis minority ion heating of 3He in D（3He） plasma, the impacts of both density and temperature on heating were discussed in the EAST parameter ranges.展开更多
Ion Bernstein waves （IBWs） have been proposed to be useful for heating and improving transport in tokamak plasmas. An Ion Bernstein wave heating experiment using different frequency （27 MHz and 30 MHz） was carried...Ion Bernstein waves （IBWs） have been proposed to be useful for heating and improving transport in tokamak plasmas. An Ion Bernstein wave heating experiment using different frequency （27 MHz and 30 MHz） was carried out on HT-7 superconducting tokamak in recent experiments. At a frequency of 30 MHz, ne peaked and Ha dropped have been pervasively observed, Tp was improved by a factor of 2 - 4, and Te increased by a factor of 1 - 1.5. An obvious confinement of particle was observed during the IBW pulse. At 27MHz, both global and localized electron heating were observed depending on the location of the ion resonant layer by changing Bt. Central electron heating effect was obtained in the global heating mode and electron temperature strongly increased near the 2 ΩD resonant layer for localized heating mode.展开更多
Ion bernstein wave （IBW） experiments have been carried out in HT-7 superconducting tokamak in recent years. The electron heating experiments concentrated on deuterium plasma with an injected RF power up to 350 kW. T...Ion bernstein wave （IBW） experiments have been carried out in HT-7 superconducting tokamak in recent years. The electron heating experiments concentrated on deuterium plasma with an injected RF power up to 350 kW. The global heating and the localized heating can be seen clearly by adjusting the ICRF resonance layer positions. The on-axis and the off-axis electron heating were realized by arranging the target plasma parameters properly. Experimental results show that the maximum increment of electron temperature was more than 1 keV, the electron temperature profile was modified by IBW under different plasma conditions and the improvements of both energy and particle confinements have been obtained.展开更多
基金supported in part by the JSPS-CAS Core-University Program in the field of Plasma and Nuclear Fusion,National Natural Science Foundation of China (No.10721505)
文摘Experimental progress of lower hybrid current drive （LHCD） and ion Bernstein wave （IBW） heating was achieved significantly in HT-7. Long pulse plasmas, up to 400 s, were obtained by LHCD. High power lower hybrid wave （LHW）, with PLHW of 800 kW at 2.45 GHz, was launched and the current drive efficiency was studied for different wave powers. Electron temperature and Zeff were measured in LHCD discharges. Heating experiment and recent results of high power ion Bernstein wave, with PIBW of 600 kW at 27 MHz, were summarized.
基金National Natural Science Foundation of China(No.10505008)
文摘In this paper a simple code has been developed to analyze power balance and qualitatively evaluate current profiles for discharges with lower hybrid current drive （LHCD） and ion Bernstein wave （IBW） heating in the HT-7 tokamak. Electron and ion thermal diffusivity, profiles of the bootstrap current density and total plasma current density can be estimated by this code using the experimental data. This code offers an easy and reasonable means to understand plasma transport in HT-7.
基金supported by National Natural Science Foundation of China (No. 10675125)
文摘Simulation on the heating scenarios in experimental advanced superconducting tokamak （EAST） was performed by using a full wave code TORIC. The locations of resonance layers for these heating schemes are predicted and the simulations for different schemes in ICRF experiments in EAST, for example, ion heating （both fundamental and harmonic frequency） or electron heating （by direct fast waves or by mode conversion waves）, on-axis or off-axis heating, and high- field-side （HFS） launching or low-field-side （LFS） launching, etc, were conducted. For the on-axis minority ion heating of 3He in D（3He） plasma, the impacts of both density and temperature on heating were discussed in the EAST parameter ranges.
基金The project supported by the Meg-science Engineering Project of the Chinese Academy of Sciences
文摘Ion Bernstein waves （IBWs） have been proposed to be useful for heating and improving transport in tokamak plasmas. An Ion Bernstein wave heating experiment using different frequency （27 MHz and 30 MHz） was carried out on HT-7 superconducting tokamak in recent experiments. At a frequency of 30 MHz, ne peaked and Ha dropped have been pervasively observed, Tp was improved by a factor of 2 - 4, and Te increased by a factor of 1 - 1.5. An obvious confinement of particle was observed during the IBW pulse. At 27MHz, both global and localized electron heating were observed depending on the location of the ion resonant layer by changing Bt. Central electron heating effect was obtained in the global heating mode and electron temperature strongly increased near the 2 ΩD resonant layer for localized heating mode.
基金supported in part by the JSPS-CAS Core-University Program in the field of Plasma and Nuclear Fusion
文摘Ion bernstein wave （IBW） experiments have been carried out in HT-7 superconducting tokamak in recent years. The electron heating experiments concentrated on deuterium plasma with an injected RF power up to 350 kW. The global heating and the localized heating can be seen clearly by adjusting the ICRF resonance layer positions. The on-axis and the off-axis electron heating were realized by arranging the target plasma parameters properly. Experimental results show that the maximum increment of electron temperature was more than 1 keV, the electron temperature profile was modified by IBW under different plasma conditions and the improvements of both energy and particle confinements have been obtained.
