  Applying gyrokinetic simulations for theoretical turbulence and transport
studies to the plasma edge and scrape-off layer (SOL) presents significant
challenges. To in particular account for steep density and temperature
gradients in the SOL, the "full-f" code PICLS was developed. PICLS is a
gyrokinetic particle-in-cell (PIC) code and is based on an electrostatic model
with a linearized field equation and uses kinetic electrons. In previously
published results we were applying PICLS to the well-studied 1D parallel
transport problem during an edge-localized mode (ELM) in the SOL without
collisions. As an extension to this collision-less case and in preparation for
3D simulations, in this work a collisional model will be introduced. The
implemented Lenard-Bernstein collision operator and its Langevin discretization
will be shown. Conservation properties of the collision operator as well as a
comparison of the collisional and non-collisional case will be discussed.
