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.
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).