A new variation of a duoPIGatron ion source, named coaxial duoPIGatron has been proposed and designed. This ion source has a magnetic center pole in the intermediate electrode, thereby feeding ionizing electrons widely to the arc chamber. The first model had produced a source plasma of excellent uniformity, but the density level was low presumably due to leakage or bridging magnetic flux in the cathode plasma region. Numerical calculations have been performed on the magnetic field structure for several shapes of the intermediate electrode with center pole. The source was designed and constructed on the basis of these numerical results and was tested experimentally. It was confirmed that the primary electrons were fed widely to the PIG chamber along the spreading magnetic lines of force, and they produced a uniform source plasma with high density. Thus the concept of hollow feeding of electrons has proved its applicability to an ion source of larger beam extracting area.