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Stellarator and Heliotron Devices
This monograph describes plasma physics for magnetic confinement of high temperature plasmas in nonaxisymmetric toroidal magnetic fields or stellarators. The techniques are aimed at controlling nuclear fusion for continuous energy production. While the focus is on the nonaxisymmetric toroidal field, or heliotron, developed at Kyoto University, the physics applies equally to other stellarators and axisymmetric tokamaks. The author covers all aspects of magnetic confinement, formation of magnetic surfaces, magnetohydrodynamic equilibrium and stability, single charged particle confinement, neoclassical transport and plasma heating. He also reviews recent experiments and the prospects for the next generation of devices.
Assessment of Stellarators as Reactors
Stellarators have significant operational advantages over tokamaks as ignited steady-state reactors: no dangerous disruptions, no need for continuous current drive and power recirculated to the plasma, less severe constraints on the plasma parameters and profiles, and access from the inboard side for easier maintenance. The US is starting a multi-year multi-institutional stellarator reactor study whose purpose is to ''identify and assess the feasibility of critical issues and their consequences for development of the stellarator concept as a steady-state fusion reactor.'' The activities during the first year are focusing on physics optimization and selection of one or more stellarator coil configurations for more detailed engineering design evaluation. The physics team is focusing on torsatron modularization, modular stellarators with lower aspect ratio, the divertor geometry, development of transport models, and overall system studies. The engineering team is studying design issues relating to minimizing the inboard thickness of the blanket and shields, the feasibility of the superconducting magnets, and maintenance schemes.
Stellarators
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Targeted Optimization of Quasi-Symmetric Stellarators
The proposed research focuses on targeted areas of plasma physics dedicated to improving the stellarator concept. Research was pursued in the technical areas of edge/divertor physics in 3D configurations, magnetic island physics in stellarators, the role of 3D shaping on microinstabilities and turbulent transport and energetic ion confinement in stellarators.
The Beta Equilibrium, Stability, and Transport Codes
The Beta Equilibrium, Stability, and Transport Codes: Application to the Design of Stellarators covers the application of the BETA computer codes to the Heliotron E plasma confinement experiment. This book is the outgrowth of a collaboration between the Courant Institute at New York University and the Plasma Physics Laboratory at Kyoto University. After briefly dealing with the history of the codes and the design of new stellarator experiments, this five-chapter book goes on presenting 15 typical runs of the BETA equilibrium, stability, and transport codes. Included with each run is a statement relating the physics of the example to the computational model. The following chapters focus on the revisions of the BETA equilibrium code by implementing a simplified neoclassical transport theory defining the geometric confinement time output by the equilibrium code. The concluding chapter provides a FORTRAN listing of the transport code.
Stellarator Physics
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