2003
DOI: 10.1088/0029-5515/43/9/314
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Experimental study on ion temperature behaviours in ECH, ICRF and NBI H2, He and Ne discharges of the Large Helical Device

Abstract: Ion heating experiments have been carried out in the large helical device using ECH (82.5, 84.0, 168 GHz, ⩽1 MW), ICRF (38.5 MHz, ⩽2.7 MW) and NBI (H° beam: 160 keV, ⩽9 MW). The central ion temperature has been observed from the Doppler broadening of Ti XXI (2.61 Å) and Ar XVII (3.95 Å) x-ray lines, which are measured using a newly installed crystal spectrometer with a charge-coupled device. Recently, in ECH discharges, on-axis heating became possible. As a result, a high Te(0) of 6–10 keV and a high ion tempe… Show more

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Cited by 18 publications
(8 citation statements)
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“…High-density discharges up to 10 15 cm −3 are produced with extremely peaked density profiles using H 2 multipellet injection, 2 and C pellet 3 is also injected in LHD for density profile control. High-ion temperature discharges 4,5 are recently achieved by negative-ionbased neutral beam injection in high-Z discharges with peaked density profiles after Ne and Ar glow discharge cleaning. It is quite interesting to study the impurity transport in those discharges.…”
Section: Introductionmentioning
confidence: 99%
“…High-density discharges up to 10 15 cm −3 are produced with extremely peaked density profiles using H 2 multipellet injection, 2 and C pellet 3 is also injected in LHD for density profile control. High-ion temperature discharges 4,5 are recently achieved by negative-ionbased neutral beam injection in high-Z discharges with peaked density profiles after Ne and Ar glow discharge cleaning. It is quite interesting to study the impurity transport in those discharges.…”
Section: Introductionmentioning
confidence: 99%
“…High-Z discharges have been attempted to achieve higher ion temperatures [19][20][21][22]. An increase in P i /n i attributed to the reduction in n i was expected in the high-Z NBI discharge.…”
Section: High-z Discharges With High Ion Temperaturementioning
confidence: 99%
“…This is based on the difference in the central ion temperature. It is well known that high ion temperature operation is possible for the rare gas discharges in LHD [32,33]. The central ion temperature of neon discharges ranges between 3-5 keV.…”
Section: Ion Temperature From Doppler Broadeningmentioning
confidence: 99%