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Volume 67 (1992)
- Issue 6 Pages 485-
- Issue 5 Pages 399-
- Issue 4 Pages 310-
- Issue 3 Pages 215-
- Issue 2 Pages 108-
- Issue 1 Pages 12-
Volume 67, Issue 3
Displaying 1-4 of 4 articles from this issue
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Yoshio Sunaga1992 Volume 67 Issue 3 Pages 215-222
Published: March 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSThe plasma is made use of not only large scaled future technologies such as nuclear fusion and MHD cower reneration but also many processes in the industry.
In this report, the outline of high heat plasmas and their some applications used as heat source is described.
As the plasma jet is an example of thermal plasmas and has ultra high temperature, it can be very widly used in the industry, including melting furnace, welding, etc.As the thermal plasma generated by radio frequency power has melting capability without impuriries, it is useful to make a pure crystal and others.As the high heat plasma beam is produced in inert gas by hot hollow cathode discharge with low electric voltage, it is effective for refining, melting and evaporation of refractory metals.View full abstractDownload PDF (653K) -
Atsushi Fukuyama, Masahiro Wakatani1992 Volume 67 Issue 3 Pages 223-243
Published: March 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSPhysics associated with burning plasmas is reviewed.Behavior of alpha particles produced by fusion reaction and response of bulk plasmas to them are main subjects in this chapter. The thermalization and confinement of alpha particles are described.The alpha-particle heating enhances the fusion reaction, while the accumulation of helium ash reduces it through dilution of fuel ions.Stabilization of the sawtooth oscillation and destabilization of the fishbone instability and the TAE mode are examined.Finally, a prospect of future studies on burning plasma is presented.View full abstractDownload PDF (2197K) -
Toshiyuki Kikunaga, Takashi Shimozuma, Hiroyuki Asano, Yoshiyuki Yasoj ...1992 Volume 67 Issue 3 Pages 244-256
Published: March 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSThe design of a120GH z, 1MW gyrotron is presented along with its performance experimentally verified.The criteria of selecting the oscillation mode are described as well as the design detail of a resonant cavity and a magnetron injection gun.The gyrotron thus developed is a demountable tube which can be separated into several parts such as a magnetron injection gun, a main body, a collector and a window.All parts are connected with flanges and can be exchanged for other parts having different characteristics.The regions operating in the TE 15, 2, 1 mode and neighboring parasitic modes were determined experimentally.An output power of610kW with an efficiency of30.6%was achieved in the TE 15, 2, 1 mode at 120.3GHz.The mode purity was also measured with a k-spectrometer.View full abstractDownload PDF (3229K) -
Mitsushi Abe, Kazuhiro Takeuchi1992 Volume 67 Issue 3 Pages 257-268
Published: March 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSA tokamak plasma equilibrium code to reconstruct the magnetic field around a plasma from measured magnetic data, was applied to the Hitachi tokamak (HT-2).It was found that a systematic measurement error is produced by the toroidal field coils and it makes an iterative calculation converge to a wrong equilibrium state.A technique to compensate for the measurement error field was developed.The plasma cross-sectional shape is then well analyzed in the HT-2 experiments.A compensating radial field of around 5x10 -4 T is necessary for a successful equilibrium calculation at a toroidal field of 1T.This value of the compensating field is consistent with the results of the experiments to optimize breakdown.This technique is applicable to all tokamaks.View full abstractDownload PDF (1342K)
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