But the only advantage of using Tungsten at this time is to avoid eddy currents. That is, copper is a diamagnetic material, so it tends to oppose magnetic field, so they may change the theoretical expectations of the model and also dissipates power due these eddy currents:
http://en.wikipedia.org/wiki/Eddy_currents
Other than that, I cannot think of another reason since tungsten is more resistive than copper.
Any other idea?
