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.
General
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