C S Pitcher and P C Stangeby 1997 Plasma Phys. Control. Fusion 39 779 doi:10.1088/0741-3335/39/6/001
C S Pitcher and P C Stangeby
Show affiliationsThe physics of divertors in tokamaks is reviewed, primarily from an experimental point of view, although where possible simple analytic modelling is included. The paper covers the four main subject areas at issue in divertor research: (1) the wide dispersal of plasma power exhausted from the main plasma, (2) the production of sufficiently high gas pressures in the vicinity of pump ducts to enable the removal of fuel and helium (`ash') gas from the system, (3) the elimination or reduction of impurity production and (4) the screening of impurities produced, or intentionally added, at the plasma boundary from the plasma core. A simple analytic model, the `two-point' model, is introduced early in the paper and provides a framework for comparison of the experimental results, drawn from many machines, with simply derived expectations. Conclusions regarding the direction of future research priorities are made.
52.55.Rk Power exhaust; divertors
52.55.Fa Tokamaks, spherical tokamaks
52.40.Hf Plasma-material interactions; boundary layer effects
Issue 6 (June 1997)
Received 1 April 1996, in final form 19 March 1997
C S Pitcher and P C Stangeby 1997 Plasma Phys. Control. Fusion 39 779
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