Java heap space

My question is regarding the error with a particle tracing simulation in a magnetic field. Simulation is time dependent and has a step of 1e-6 seconds to 1 second, the mesh is around of 1 600 000 elements. The simulation gives me the error "Java heap space" at the end of computation and also in some trials with the same simulation also shows me the error mentioned an "Out of memory" upon particle tracing plot.

Thanks for your help

in the attached: image of error