  A 1D code modelling SOL transport parallel to the magnetic field (SOLF1D) is
benchmarked with 2D simulations of MAST-U SOL performed via the SOLPS code for
two different collisionalities. Based on this comparison, SOLF1D is then used
to model the effects of divertor leg stretching in 1D, in support of the
planned Super-X divertor on MAST. The aim is to separate magnetic flux
expansion from volumetric power losses due to recycling neutrals by stretching
the divertor leg either vertically or radially.
