The present invention relates to a magnetic stimulation system (1300) comprising a first coil (1302). The first coil (1302) comprises a single wire having a plurality of turns (110). The system further comprises a shield (1306, 1600), comprising an external surface (1402) and an internal surface (1406) both comprising a nonconductive material, an internal cavity defined between the external surface (1402) and the internal surface (1406), a first opening (1408) penetrating through the shield (1306, 1600) and communicating the external surface (1402) and the internal surface (1406), and a first channel (1412), formed on the external surface (1402) and intersecting the first opening (1408), wherein the depth of first channel (1412) extends through the entire thickness of the shield (1306, 1600) to divide the internal cavity. The system further comprises a conductive substance filled in the internal cavity.
