i tried that way already. i get error
// Error: file: C:/Program Files/Autodesk/Maya2013/scripts/others/assignNSolver.mel line 233: No nucleus related object selected for solver assignment
but your tutorial brought me to the right solution. in the create emitter option box i switched existing nucleus to a new one. that way i don't get the error message, and the emitter works fine. thank you for the help.