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| 1 | MHD Instabilities and Their Effects on Plasma Confinement in Large Helical Device Plasmas with Intense Neutral Beam Injection显示文摘MHD stability of the Large Helical Device (LHD) plasmas produced with intense neutral beam injection is experimentally studied. When the steep pressure gradient near the edge is produced through L-H transition or linear density ramp experiment, interchange-like MHD modes whose rational surface is located very close to the last closed flux surface are strongly excited in a certain discharge condition and affect the plasma transport appreciably. In NBI-heated plasmas produced at low toroidal field, various Alfvén eigenmodes are often excited. Bursting toroidal Alfvén egenmodes excited by the presence of energetic ions induce appreciable amount of energetic ion loss, but also trigger the formation of internal and edge transport barriers. | K.Toi S.Ohdachi S.Yamamoto S.Sakakibara K.Y.Watanabe N.Nakajima X.Ding J.Li S.Morita K.Narihara K.Tanaka T.Tokuzawa H.Yamada Q.Yang | 2004 | Plasma Science and Technology2004，6，3： | 3 |
| 2 | Progress of LHCD and IBW Heating Experiments on HT-7 Tokamak显示文摘Experimental progress of lower hybrid current drive(LHCD)and ion Bernsteinwave(IBW)heating was achieved significantly in HT-7.Long pulse plasmas,up to 400 s,wereobtained by LHCD.High power lower hybrid wave(LHW),with P_(lhw)of 800 kW at 2.45 GHz,was launched and the current drive efficiency was studied for different wave powers.Electrontemperature and Z_(eff)were measured in LHCD discharges.Heating experiment and recent resultsof high power ion Bernstein wave,with P_(ibw)of 600 kW at 27 MHz,were summarized. | 高翔 赵燕平 袭先祖 胡立群 单家方 K.TOI S.MORITA 刘瑾 许平 徐强 刘海庆 杨建华 万宝年 李建刚 | 2009 | Plasma Science and Technology2009，11，4： | 1 |
| 3 | Density Modulation Experiments on HT-7 Tokamak显示文摘Density modulation experiments are successfully conducted on HT-7 ohmic discharge to investigate particle transport coefficients: diffusion coefficients D and convection velocity V. The particle transport is studied at low(1.5 × 10^19 m^-3) and high (3 × 10^19 m^-3) density regimes. The clear differences are observed that D is 0.42m^2/s and 0.17m^2/s, V is 4.7m/s (outward) and 1.6m/s (inward) for low and high density plasmas respectively, where spatially constant D and V(r) = (r/α)Vo were assumed for the analysis. | K.Tanaka 高翔 揭银先 R.Sakamoto K.Toi | 2004 | Chinese Physics Letters2004，21，12： | 0 |
| 4 | Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfvén Eigenmodes in the Large Helical Device显示文摘Beam-ion losses induced by fast-ion-driven toroidal Alfvén eigenmodes (TAE) were measured with a scintillator-based lost fast-ion probe (SLIP) in the large helical device (LHD). The SLIP gave simultaneously the energy E and the pitch angle χ=arccos(v // /v) distribution of the lost fast ions. The loss fluxes were investigated for three typical magnetic configurations of R ax vac =3.60 m, 3.75 m, and 3.90 m, where R ax vac is the magnetic axis position of the vacuum field. Dominant losses induced by TAEs in these three configurations were observed in the E/χ regions of 50~190 keV/40°, 40~170 keV/25°, and 30~190 keV/30°, respectively. Lost-ion fluxes induced by TAEs depend clearly on the amplitude of TAE magnetic fluctuations, R ax vac and the toroidal field strength Bt . The increment of the loss fluxes has the dependence of (bTAE /Bt ) s . The power s increases from s = 1 to 3 with the increase of the magnetic axis position in finite beta plasmas. | K.OGAWA M.ISOBE K.TOI F.WATANABE D.A.SPONG A.SHIMIZU M.OSAKABE D.S.DARROW S.OHDACHI S.SAKAKIBARA LHD Experiment Group | 2012 | Plasma Science and Technology2012，14，4： | 0 |
| 5 | Density Modulation Experiments to Determine Particle Transport Coefficients on HT-7 Tokamak显示文摘The particle diffusion coefficient and the convection velocity were studied based on the density modulation using D_2 gas puffing on the HT-7 tokamak. The density was measured by a five-channel FIR interferometer. The density modulation amplitude was 10% of the central chord averaged background density and the modulation frequency was 10 Hz in the experiments. The particle diffusion coefficient (D) and the convection velocity (V) were obtained for different background plasmas with the central chord averaged | 揭银先 高翔 K.TANAKA R.SAKAMOTO K.TOI 刘海庆 高丽 M.ASIF 刘瑾 徐强 童兴德 程永飞 | 2006 | Plasma Science and Technology2006，8，2： | 0 |
| 6 | Progress in Physics and Technology Developments for the Modification of JT-60显示文摘Recent progress in the physics and engineering design study for the modification programme of JT-60 is presented.In order to achieve a steady state high-β plasma operation,which is the dominant issue of this programme,physics design for the MHD control and the stability analysis is investigated.Engineering design and the R & D for the superconducting coils,irradiation shield are performed well towards the mission of programme. | H.Tamai M.Matsukawa G.Kurita N.Hayashi K.Urata Y.M.Miura K.Kizu K.Tsuchiya A.Morioka Y.Kudo S.Sakurai K.Masaki T.Suzuki M.Takechi Y.Kamada A.Sakasai S.Ishida K.Abe A.Ando T.Cho T.Fujii T.Fujita S.Goto K.Hananda A.Hatayama T.Hino H.Horiike N.Hosogane M.Ichimura Tsuji-Iio S.Itoh M.Katsurai M.Kikuchi A.Kohyama H.Kubo M.Kuriyama M.Matsuoka Y.Miura N.Miya T.Mizuuchi K.Nagasaki H.Ninomiya N.Nishino Y.Ogawa K.Okano T.Ozeki M.Saigusa M.Sakamoto M.Satoh M.Shimada R.Shimada M.Shimizu T.Takagi Y.Takase T.Tanabe K.Toi Y.Ueda Y.Uesugi K.Ushigusa Y.Yagi T.Yamamoto K.Yatsu K.Yoshikawa | 2004 | Plasma Science and Technology2004，6，1： | 0 |
| 7 | Observation of MHD Instabilities Driven by Energetic Electrons in the Large Helical Device显示文摘Coherent magnetic fluctuations in an acoustic range of frequency have been regularly observed in low-density(n_e<0.2×10^(19)m^(-3))plasmas with strong second harmonic electron cyclotron resonance heating(ECRH)on the Large Helical Device.Hard X-ray measurements indicated that energetic electrons are generated in these ECRH discharges.The magnetic fluctuations are suppressed in higher density discharges where energetic electrons are not present.The ECRH power modulation experiment indicated that the observed magnetohydrodynamic(MHD)mode has an acoustic nature rather than an Alfvenic nature. | Mitsutaka ISOBE Kunihiro OGAWA Akihiro SHIMIZU Masaki OSAKABE Shin KUBO K.TOI the LHD Experiment Group | 2015 | Plasma Science and Technology2015，17，4： | 0 |
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