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Volume 61 (1989)
- Issue 6 Pages 367-
- Issue 5 Pages 287-
- Issue 4 Pages 207-
- Issue 3 Pages 137-
- Issue 2 Pages 77-
- Issue 1 Pages 5-
Volume 61, Issue 5
Displaying 1-4 of 4 articles from this issue
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Shunji Tsuji, Masafumi Azumi1989 Volume 61 Issue 5 Pages 287-306
Published: May 20, 1989
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSExperimental observations and theoretical models on sawtooth oscillations in tokamaks are reviewed. Sawteeth in large tokamaks show complex behavior such as postcursor, no precursor, compound sawteeth and monster sawteeth. The Kodomtsev reconnection model contradicts with fast sawtooth crash and tomographic reconstructions which demonstrated a kink-like movement of the hot core and formation of a cold bubble. Poloidal magnetic measurements revealed that sawteeth occur with a central q well bellow one in conflict with the quasi-interchange model. MHD simulations incorporating thermal transport in attempt to explain the whole process are in progress.View full abstractDownload PDF (2497K) -
Koshichi Noto1989 Volume 61 Issue 5 Pages 307-321
Published: May 20, 1989
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSFollowing the recent worldwide progress in plasma physics for fusion technology, it is desired 1.high field, 2.high current density, 3.high rigidity, 4.long pulsed (or continuous) operation, and so on-for the forecoming nuclear fusion experimental facilities. It is, therefore, worldwide trend that these facilities are designed to be superconductive.
In this article, after the review on recent progress in superconducting materials development including newly discovered high Tc oxide superconductors, several hurdles which must be cleared for the development of wires and/or conductors for high field large scale superconducting magnets will be discussed.View full abstractDownload PDF (1673K) -
Tihiro Ohkawa1989 Volume 61 Issue 5 Pages 322-327
Published: May 20, 1989
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSWhen the temperature profile is steeper than the adiabatic profile for a given density profile, plasma can release the free energy by increasing the entropy. The resultant turbulence is viewed as a heat engine. The work of the engine is used to transport the plasma particles to the higher density region. Thus, the outward heat transport and the inward particle transport have a definite relationship in a steady state.View full abstractDownload PDF (422K) -
Appearance of an Intrinsic StructureZensho Yoshida1989 Volume 61 Issue 5 Pages 328-337
Published: May 20, 1989
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSStructures in plasma equilibria have been studied with discussing the symmetry and its breaking. Structures in physics have been separated into two different classes one is a class of extrinsic structures which are characterized in responses to external conditions, and the other is a class of intrinsic structures which are intrinsically internal structures. An eigenfunction of a Schrödinger operator is a typical example of an intrinsic structure. A plasma equilibrium is also an example of an intrinsic structure. The free-decay plasma equilibrium is a distinguished dissipative structure which is self-organized through fluctuations of global kink modes. The intrinsic structure of the free-decay equilibrium has been studied by analyzing the spectra of the differential operator rot. The voltex fields are quantumized by the spectral resolution of the self-adjoint rotation operator. A free-decay state usually has a symmetry induced by the cohomology of the torus. The symmetry breaking (bifurcation) occurs at a discrete eigenvalue of the self-adjoint rot through a superposition of a corresponding quantumized voltex.View full abstractDownload PDF (1096K)
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