1. The current density depends on the cooling conditions and the size of the core.
With natural cooling one should choose 4-6A/mm^2.
If a fan is used, the current density can be set higher, up to 8-10A/mm^2.
Higher current density indicates smaller cores.
With artificial cooling, the allowed current density depends on it's intensity.

        2. I suggest to let the program calculate the diameters of the wires and the number of the wires in the windings first to make the best of a given diameter.

        3. To add a new core to the database, you have to enter a name.

        4. When adding a new core to the database, it is better to use the checkbox "Add to database (input data)". Please take the parameters from the manufacturer's documentation.
    The symbols mean the following parameters:
	Ae - Effective cross section area, mm2
	le - Length of the magnetic path, mm
	An - Area of the core window, mm2
	Ve - Volume of the core, cm3
The area of the core window and the volume of the core is being calculated by the program based on the input data and the geometric sizes.
If the core is covered, the geometry of the core with the cover should be entered.