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Sketch of divertor types: single and double null tokamak divertors (toroidally symmetric), and island divertor. From [1].

A divertor configuration is a magnetic field configuration in which the toroidally confined (plasma) region is separated from the outside world by a separatrix - as opposed to a limiter configuration in which the plasma's Last Closed Magnetic Surface is determined by the intersection of field lines by a material object.

One can distinguish 'tokamak divertors' (characterised by toroidal symmetry and one or two X-points or 'nulls') and 'island divertors' (for stellarators). [1]

The term 'divertor' can refer to:

  • the magnetic field structure beyond the X-point and in contact with material surfaces, or
  • the material structure intersecting the 'outgoing legs' of the magnetic separatrix surface.

The divertor region between the 'outgoing legs' - the region between the material divertor and the X-point, up to the separatrix - is known as the private flux region (PFR).

See also


  1. 1.0 1.1 Y. Feng, F. Sardei, P. Grigull, K. McCormick, J. Kisslinger and D. Reiter, Physics of island divertors as highlighted by the example of W7-AS, Nucl. Fusion 46 (2006) 807