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Volume 55 (1986)
- Issue 6 Pages 449-
- Issue 5 Pages 391-
- Issue 4 Pages 311-
- Issue 3 Pages 243-
- Issue 2 Pages 111-
- Issue 1 Pages 6-
Volume 55, Issue 3
Displaying 1-5 of 5 articles from this issue
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Effects of Anisotropic ExcitationTakashi Fujimoto, Atsumu Hirabayashi1986 Volume 55 Issue 3 Pages 243-256
Published: March 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSA review is given of the excitation anisotropy in atomic or ionic level population, or alignment, and its effects on the line intensity : anisotropic intensity distribution and polarization. We take the optical excitation as an example of producing alignment and show various features of its effects. For other anisotropic-excitations, collisional excitation by electrons and charge transfer excitation of ions, latest results of the theoretical and experimental studies are presented. Relaxation of alignment is brought about by several mechanisms : disalignment by atomic collisions and by trapped radiation is understood fairly well, while nothing is known about electron collision and ion collision.View full abstractDownload PDF (1178K) -
Yuichi Sakamoto1986 Volume 55 Issue 3 Pages 257-271
Published: March 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIn order to reduce light impurities in hot plasmas in nuclear fusion devices, we have two techniques established, bake-out and discharge cleaning. Here is given a short lecture on these techniques. We are confronting increase in engineering complexity to construct fusion machines. This trend led the author to take a view point searching possibility of “decrease in baking temperature, or rather room-temperature-pumping”. Concerning the discharge cleaning, description is focused on utilization of hydrogen plasma of low electron temperature.View full abstractDownload PDF (1367K) -
Shigeru Sudo1986 Volume 55 Issue 3 Pages 272-282
Published: March 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSRecent pellet injection experiments are surveyed based upon the international pellet fueling workshop held in 1985. It is generally confirmed that pellet injection is effective for increasing a plasma density in the present devices. Some experiments show improvement of plasma confinement property after pellet injection. Present effort to develop a new pellet injector (mainly for increasing flexibility and pellet velocity) is also described.View full abstractDownload PDF (1148K) -
Osamu Kaneko, Yoshihide Oka, Keiichi Sakurai, Tsutomu Kuroda, Masahiro ...1986 Volume 55 Issue 3 Pages 283-290
Published: March 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSA fast shutter valve has been developed to minimize the amount of tritium flowing into the neutral beam line or the diagnostic equipments for burning plasma experiment. With the aperture of 20 cm in diameter, the conductance of 1 l /sec for hydrogen molecules has been obtained in closed position. The total time from the command-to-open signal when the shutter is in the full closed position, or vice versa during closing, is less than 150 msec. The valve has been tested for more than 10, 000 cycles and no deleterious effects have been found.View full abstractDownload PDF (1223K) -
Shinichi Ishida, Zensho Yoshida, Kenichi Hattori, Yoshiki Murakami, Ju ...1986 Volume 55 Issue 3 Pages 291-303
Published: March 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe characteristics of ultra-low-q discharges (0<qa<1) have been studied in REPUTE-1. Results from magnetic probe measurements and parameter scans for the discharges are described. It is found that a q profile with dq/dr<0 is formed in the setting-up phase and a high density plasma with the order of ñe-1020m-3 is obtained during the discharge duration of about 15 msec for low toroidal fields (<2 kG).View full abstractDownload PDF (1496K)
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