Comparative Study of Confinement Physics in Toroidal Plasmas

根据美国国家核聚变科学研究所和澳大利亚国立大学于1995年5月达成的学术交流协议，该项目旨在了解发生在环形几何中的各种等离子体现象的物理机制，如螺旋系统等离子体。1.在等离子体理论、三维有限压力平衡中磁岛的形成和自愈、压力驱动不稳定性的线性稳定性和非线性时间发展、螺旋轴星体磁场结构的优化、等离子体自组织以及利用虚拟现实系统开发先进的可视化技术等方面进行了成功的合作研究。2.在等离子体加热实验方面，合作研制了电子回旋共振加热装置，并将其应用于ANU的H-1螺旋装置。此外，对离子回旋共振加热等离子体加热的可能性进行了分析，并证明了它在螺旋轴星形加速器复杂几何结构中的有效性。3.对NIFS中的CHS和ANU中的H-1的等离子体约束进行了比较研究，揭示了涨落驱动粒子通量的共同性质。这一新的认识表明，不仅对于恒星加速器，而且对于托卡马克等离子体，都存在改进的限制机制。4.在合作研究的基础上开发了等离子体密度诊断的新方法，并将该装置应用于LHD等离子体测量，证明了该方法具有实用水平。

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.