This book reviews recent progress in our understanding of tokamak physics related to steady state operation, and addresses the scientific feasibility of a steady state tokamak fusion power system. It covers the physical principles behind continuous tokamak operation and details the challenges remaining and new lines of research towards the realization of such a system. Following a short introduction to tokamak physics and the fundamentals of steady state operation, later chapters cover parallel and perpendicular transport in tokamaks, MHD instabilities in advanced tokamak regimes, control issues, and SOL and divertor plasmas. A final chapter reviews key enabling technologies for steady state reactors, including negative ion source and NBI systems, Gyrotron and ECRF systems, superconductor and magnet systems, and structural materials for reactors. The tokamak has demonstrated an excellent plasma confinement capability with its symmetry, but has an intrinsic drawback with its pulsed operation with inductive operation. Efforts have been made over the last 20 years to realize steady state operation, most promisingly utilizing bootstrap current. Frontiers in Fusion Research II: Introduction to Modern Tokamak Physics will be of interest to graduate students and researchers involved in all aspects of tokamak science and technology.
This monograph presents a proposal for interdisciplinary and international research that uses varve as an essential tool. The discovery and subsequent palaeoenvironmental studies of the annually laminated sediments of Lake Suigetsu (Japan) revealed the directionality of a new discipline in the traditional field of historical science. The historical evidence of environmental changes and natural disasters provided by annually laminated sediments promote an integration of human and natural histories on a common time scale. To explore the impact of climatic changes and natural disasters on civilized society in the present and past, we simply open this door and enter a new phase in world history. The high resolution data about environmental history like climate, sea level, vegetation changes and natural disasters under the most reliable varve chronology will be discussed in relation to the development of human history and the rise and fall of civilizations. The book shows the direction of a new world history and new cosmology of the future civilization in relation to the environmental changes.
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