| 1 | Effect of Ne Glow Discharge on Ion Density Control in LHD显示文摘Neon glow discharge cleaning was firstly attempted in Large Helical Device (LHD) instead of He glow discharge to remove hydrogen neutrals and to control the ion density, hi. The Ne glow discharge continued for 8 hours overnight after a three-day experiment. At the second night Ha emission became weaker than the emission usually observed in the He glow discharge. A clear reduction of the hydrogen influx was also observed in neutral beam injection (NBI) dischargeswith Ne puff, whereas the neon recycling was strongly enhanced with appearance of a flat density profile. As a result, the lowest density limit was further reduced down to 0.2×10^13 cm^-3. Theuse of Ar puff formed a peaked density profile with a high Ti of 7 keV. | S.Morita M.Goto S.Masuzak H.Suzuki K.Tanaka H.Nozato Y.Takeiri J.Miyazawa LHD experimental group | 2004 | Plasma Science and Technology2004，6，5： | 0 |
| 2 | High Power Neutral Beam Injection in LHD显示文摘The results on high power injection with the neutral beam injection(NBI)systemfor the Large Helical Device(LHD)are reported.The system consists of three beam-lines withtwo hydrogen negative ion(H^- ion)sources installed in each beam-line.In order to improvethe injection power,a new beam accelerator with a multi-slot grounded grid(MSGG)has beendeveloped and applied to one beam-line.Using the accelerator,a maximum power of 5.7 MW wasachieved in 2003 and 2004,and the maximum energy of 189 keV was reached.The power andenergy exceeded the design values of the individual beam-line for LHD.The other beam-lines alsoincreased their injection power up to about 4 MW,and the total injection power of 13.1 MW wasachieved with three beam-lines in 2003.Although the accelerator had an advantage in high powerbeam injection,extracted beams expand in the short side direction of the ground-grid slot.Thedisadvantage has been resolved by modifying the aperture shapes of the steering grid. | K.TSUMORI Y.TAKEIRI K.NAGAOKA K.IKEDA M.OSAKABE Y.OKA O.KANEKO M.SHIBUYA T.KONDO M.SATO E.ASANO | 2006 | Plasma Science and Technology2006，8，1： | 0 |
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