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Volume 63 (1990)
- Issue 6 Pages 429-
- Issue 5 Pages 311-
- Issue 4 Pages 219-
- Issue 3 Pages 143-
- Issue 2 Pages 91-
- Issue 1 Pages 5-
Volume 63, Issue 3
Displaying 1-4 of 4 articles from this issue
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Masao Okamoto, Masafumi Azumi, Mitsuru Kikuchi, Shinji Tokuda, Keiji T ...1990 Volume 63 Issue 3 Pages 143-160
Published: March 20, 1990
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSRecently it is reported that the neoclassical bootstrap currents were observed in three big tokamaks-TFTR, JET, and JT-60. Also in helical systems of ATF and CHS the existence of bootstrap current is being confirmed. In this article, the verification of bootstrap currents and associated theories are presented.View full abstractDownload PDF (1764K) -
Masahiro Mori, Haruyuki Kimura, Sigeru Tanaka1990 Volume 63 Issue 3 Pages 161-176
Published: March 20, 1990
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSDesigns of non-inductive current drive systems in ITER and FER are presented. Properties of four current driving methods (neutral beam current drive, lower hybrid current drive, ion cyclotron current drive, electron cyclotron current drive) are compared, and problems to be overcome are also described.View full abstractDownload PDF (1769K) -
Tsuneo Ban, Makoto Katsurai1990 Volume 63 Issue 3 Pages 177-195
Published: March 20, 1990
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe stabilization of the tilt motion of spheromak plasmas in a conducting vessel by a rotational motion and the relaxation of its rotational velocity are investigated by means of a three-dimensional magnetohydrodynamic simulation. Two types of rotational velocity are considered; the velocity with a toroidal component only, and the velocity with toroidal and poloidal components. These components are assumed to be proportinal to the corresponding components of the initial magnetic field. In both cases, the initiation of the tilting instability can be delayed by plasma rotation, but for complete stabilization, a large rotational velocity such as Mach one is required. However, when the rotational velocity is larger than Mach one, a different kind of instability is found to take place. The analysis of the relaxation of the rotational velocity shows that the toroidal velocity component and the poloidal velocity component relax in different manners; i.e. the toroidal component is conserved, while the poloidal component decreases gradually with time.View full abstractDownload PDF (1879K) -
Kazuya Uehara, Yuichi Watanabe, Marshall Loring, George Badger1990 Volume 63 Issue 3 Pages 196-207
Published: March 20, 1990
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe radio frequency (RF) systems in fusion plasma heating often use broadcasting transmitter techniques. For example, the RF heating system in JT-60 was built using broadcasting technology. Also, a new, high efficiency UHF power amplifier electron tube, the Klystrode, which was developed in the USA for TV can be used for fusion plasma systems. While Japanese broadcasting engineers had an effort to develop solid state UHF amplifiers with high power, the USA is developing new high power tubes such as the klystrode. In this paper we will discuss the feasibility of applying a solid state amplifier and klystrode for fusion plasma heating.View full abstractDownload PDF (2239K)
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