Moving laser

I'm a simulation a moving laser though a zinc pill, the problem is that i can't move the surface with the heat flux, the thing is that if i use a Parametric sweep Comsol will compute one point and ignore the other ones, like doing 1 study with each point of the laser and not a complete line. The other thing that i've been trying is to change the position of the circle with heat flux but i can't do this because it only accepts parameters an they can't depend of time or any other variable.

If someone can help me please...

Thanks