Atomic and Molecular Processes in Fusion Edge Plasmas
The recent progress of thermonuclear fusion research based on the magnetic confinement of high-temperature plasmas, as weil as the design ofthe first experi mental fusion tokamak reactors, has demonstrated that the physical conditions at the plasma periphery playa decisive role in achieving, maintaining, and controlling the thermonuclear bUffi. Because it is an interface between the hot burning deute rium-tritium plasma and the cold material walls ofthe reactor vessel, the boundary (or the edge) plasma has to fulfill many functions related to the protection of the reactor walls from the intense particle and power fluxes generated in the reactor burning zone, protection of the central plasma from contamination by nonhydro genie wall impurities (which dilute the thermonuclear fuel and degrade the burn conditions), exhaust of the thermal plasma power and the reactor ash (thermalized helium), etc. These functions of the boundary plasma can be accomplished by suitable modification of the configuration of the confining magnetic field in the edge region and by an appropriate use of the radiative and collisional properties of atomic, ionic, and molecular species present (or deliberatcly introduced) in the plasma edge region.
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Basic Properties of Fusion Edge Plasmas and Role of Atomic
Atomic and Molecular Processes in the Plasma Edge
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approximation Astron Astrophys autoionization beam branching ratio calculations capture cross sections CC LS channel charge transfer Chem close-coupling collision energies collision strengths collision systems collisional cross section measurements D. C. Gregory differential cross section dissociative recombination distorted-wave divertor elastic electron capture electron energy electron impact excitation electron impact ionization electron transfer endothermic energy range excitation cross sections exothermic experimental data factor Figure G. H. Dunn Gryzinski H. B. Gilbody He2+ helium hydrogen impurities interaction ionization cross section ions isoelectronic keV/amu large number low-energy M. J. Seaton merged-beams metastable method molecules momentum transfer neutral obtained Peart Penning ionization Phys plasma edge potential Pradhan R-matrix R. A. Phaneuf R. K. Janev radiative rate coefficients region resonant scattering semiclassical state-selective T. D. Mark T. J. Morgan Table target theoretical threshold total cross section transfer cross sections transitions two-electron vibrational quantum number wave functions