Which solver in CST is suitable to MHz Application?

Hi. Every one.
I am using CST 2013. I need to simulate a Wireless Power Transfer system with operating frequency = 6~7 MHz. (Wavelength=50m).

My WPT System includes coils with diameter about 60cm and thin metal layers about 0.1mm.

I want to ask with this frequency range (MHz) and this structure, which solver in CST is the most suitable? CST Microwave Studio, CST EM Studio...? and what is the box size I should use.
Is there any advice about meshing technique?

Currently, I use CST Microwave Studio with the distance from objects to box is 1.5m. But the simulation time is too slow.

Any help? I thank you very much.

nvt

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