Dipole Field Vs Coil Thickness (for any coil radius)
In dipoles, conductor amount is proportional to the aperture size (linear).
Note: The coil thickness is proportional to the field, but the conductor amount is not proportional to the field. The conductor amount is computed/optimized differently.
The curve is computed for Jo=700 A/mm2. However, Jo is a function of the field. The curve scales as Jo.