The experimental and theoretical researches on high-beta tokamaks are surveyed. The basic properties of ballooning modes and the recent progress in high-beta studies are discussed with emphasis on the beta scaling laws, the accessibility to the “second stability” high-beta region, the excitation of new instabilities, the degradation of the plasma confinement and the future plans for high-beta tokamaks.
The overview of computational works and the methods of computational physics on plasmas in the fusion devices is given. This is the first issue on this topics, which describes fundamental methods for plasma models-the particle models, the fluid models, and other statistical physics models.
Thermonuclear reaction particle measurements and diagnostics of ICF Plasma are reviewed. Measurements of density-radius product by the neutron activation and knock-on praticle methods are dicussed as well as the measurements of neutron yield and energy spectrum. Charged particle measurements are also addressed.
The ECR discharge cleaning was applied to many torus devices (JFT-2, JIPP T-II, TEXTOR). This report describes the technical development of microwave launcher, power source and measuring systems.
Recently computer graphics technology is developing rapidly. In the field of the fusion plasma physics, too, this technology is useful to analyze and clearly show complicated three dimensional processes. In this report, hardware configuration of a color graphic display is summarized.
A new type VUV detector with plane electrodes deposited on a crystalline quartz has been fabricated and evaluated. The external quantum efficiency of the detector was measured for radiation between 45 nm and 140 nm, and has a maximum value of about four percent at 70 nm. The fundamental absorption edge of the crystalline quartz is found to be at 150 nm. The noise equivalent power for this detector is about 1.25×10-11 W. The detector was employed on trial to measure the helium discharge spectrum, and has given satisfactory results.