Comparative Study of Confinement Physics in Toroidal Plasmas

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Based on agreement on academic exchange between National Institute for Fusion Science (NIFS) and the Australian National University (ANU), which was concluded on May, 1995, this project has aimed at understanding physics mechanism of various plasma phenomena occurring in toroidal geometry like the helical system plasma. 1. Concerning plasma theory, magnetic island formation and self-healing in three dimensional finite pressure equilibria, linear stability and nonlinear time development of pressure driven instabilities, optimizationof magnetic field configuration for helical axis stellarator, plasma self-organization, and development of advanced visualization technology by using virtual reality system are studied successfully as collaborative researches. 2. As for plasma heat ingexperiment, a device for electron cyclotron resonance heating was developed as a collaborative research, and was applied for the H-1 helical device in ANU.In addition, possibility of plasma heating by using ion cyclotron resonance heating was analyzed and proved to be valid in the complex geometry of helical axis stellarator. 3. Comparative study of plasma confinement between CHS in NIFS and H-1 in ANU has been executed, and common properties concerning fluctuation-driven particle flux was revealed. The new knowledge suggests existence of improved confinement mechanism not only for stellarator, but also for tokamak plasnas. 4. Innovative methods for diagnosis of plasma density have been developed out of collaborative research, and were proved to be of practical level by applying the device in LHD plasma measurements.