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Volume 53, Issue 1
Displaying 1-6 of 6 articles from this issue
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Yuichi Sakamoto1985 Volume 53 Issue 1 Pages 7-23
Published: January 20, 1985
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSAn explanation on discharge cleaning and surface conditioning in nuclear fusion devices is given. Problems are described from practical view points for readers to consider the wall conditioning of machines near to them. Features of cleaning methods, especially of the glow discharge and the ECR discharge cleaning methods, are compared.View full abstractDownload PDF (1219K) -
Satoshi Kasai1985 Volume 53 Issue 1 Pages 24-28
Published: January 20, 1985
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSIn tokamaks a radiation from impurities (light and metal elements) is a large and direct energy loss from a plasma. In order to find methods of control and reduction of impurities, species, quantity, transport and source of an impurity have been investigated by time-and space-resolved spectroscopic measurements of emission from intrinsic and tracer impurities. In this report, recent topics of an impurity transport study. a Doppler ion temperature measurement in tokamak plasmas and a study of atomic and molecular data by using a tracer impurity are summarized.View full abstractDownload PDF (544K) -
Katsuya Narushima1985 Volume 53 Issue 1 Pages 29-54
Published: January 20, 1985
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe TRISTAN Electron Positron Colliding Ring consists of a main ring of 30GeV (e-, e+) with a diameter of approx. 1000m, and a subordinate ring of 6-8GeV (e-, e+) with a diameter of approx. 100m for preacceleration and storage. Both rings require a pressure of approx. 10-9 Torr at Beam On and a pressure of approx. 10-10 Torr at Beam Off, respectively.
Considering the effect of beam on the vacuum, the chamber is made of aluminum alloy with a high cooling efficiency because the inner walls are exposed to very powerful radiation (3kW/m (approx. 100W/cm2)). Generally, aluminum alloy with a high outgassing rate has been thought of as unsuitable for ultra-high vacuum material. A newly developed aluminum alloy produced by special extrusion, however, shows an outgassing rate in the order of 10-14 Torr l/s·cm2 due to 24-hour baking at 150°C. Also, the residual radioactivity in the aluminum new alloy is noticeably reduced, compared with stainless steel. The above-mentioned facts prove that this alloy is excellent as ultra-high vacuum material.
As a result of the experiment using the aluminum alloy in all vacuum parts it is confirmed that, contrary to the conventional view, aluminum alloy is most suitable for ultra-high vacuum material and that the TRISTAN Ring in which the alloy is used can be operated with a satisfactory performance.View full abstractDownload PDF (2241K) -
Sumio Kogoshi, Hiroyuki Osaki, Yoshiyuki Iida, Tadashi Sekiguchi1985 Volume 53 Issue 1 Pages 55-66
Published: January 20, 1985
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe windback method to make modular coils from al=2 Torsatron/Heliotron helical coils is described. The produced modular Torsatron/Heliotron coil system has a magnetic well, medium rotational transform, and magnetic shear.View full abstractDownload PDF (990K) -
Tetsuo Kamimura, Yoshihiko Abe, Hideo Ikegami1985 Volume 53 Issue 1 Pages 67-88
Published: January 20, 1985
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSInitial testing of the US-Japan Data Link has proceeded and the entire system is approaching operational status. An overview of the technical structure of the linkage is given. The file transport and interactive terminal capabilities are discussed and specific example are included. Some considerations of the initial use and scope of allowed activities, and the management of the Linkage are also outlined.View full abstractDownload PDF (1560K) -
1985 Volume 53 Issue 1 Pages 91
Published: 1985
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSDownload PDF (52K)
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