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Author(s):
N. Ohyabu
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Title:
A New Boundary Control Scheme for Simultaneous Achievement of H-mode and Radiative Cooling (SHC Boundary)
Date of publication:
May 1995
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Key words:
Tokamak, Divertor, Ergodic Boundary, H-mode, Radiative Cooling, Heliotron, Heat Removal, Island
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Abstract:
We have proposed a new boundary control scheme (SHC boundary), which could allow simultaneous achievement of the H-mode type confinement improvement and radiative cooling with wide heat flux distribution. In our proposed configuraion, a low m island layer sharply separates a plasma confining region from an open "ergodic" boundary. The degree of openness in the ergodic boundary must be high enough to make the plasma pressure constant along the field line, which in turn separates low density plasma just outside the plasma confining region (the Key external condition for achieving a good H-mode discharge) from very high density, cold radiative plasma near the wall (required for effective edge radiative cooling). Examples of such proposed SHC boundaries for Heliotron typed devices and tokamaks are presented.
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