Collisional effects in the tokamap

Plasmas confined in tokamaks with non-symmetric perturbations are surrounded by a chaotic layer of magnetic field lines that guide charged particles to the tokamak wall. We use an analytical two-dimensional symplectic mapping to study the resulting fractal patterns of field line escape. However, particles may experience several collisions before escaping toward the tokamaks wall. We add a random collisional term to the field line mapping to investigate how the particle collisions modify their escape patterns. -- Highlights: ► The tokamap is a symplectic map describing chaotic field lines in tokamaks. ► Collisional effects can be simulated by adding random noise to the field line map. ► We study the collisional effects in the tokamap for describing escaping field lines.