I introduced a very high generation rate object into my DEVICE simulation of an unbiased waveguide. It is a transient simulation 5.5 ps long, with 0.5 ps minimum timesteps. The simulation runs fine when the generation rate object is disabled. However, I am having a lot of trouble getting the sim to converge with the generation rate object enabled. One thing I have tried is to introduce the generation rate object slower using the global shutter. I currently have the shutter opening at 0.5 ps, following a log slew function with t_slew = 5 ps. This seems to help with convergence at most timesteps but the simulation still fails to converge at the final timestep. I have also increased the mesh refinement sensitivity and the max refine steps. Doing so should help with convergence correct? Anyways, still no convergence. I would be very grateful if anyone is willing to take a look at my sim linked below and suggest anything else I can try to get convergence.