Seabed Coil Using High Temperature Superconducting (HTS) Cable for Ship Magnetic Deperming

Ship magnetic deperming has been conducted to reduce the magnetization of ship for avoiding the risk of being detected by weapons equipped with magnetic sensors. For deperming of the ship, moderate magnetic field is to be imposed on the volume equivalent of the ship, with alternately changing direction and gradually decreasing intensity. We study a system of high electric current cable laid on the seabed for purpose of naval ship magnetic deperming. Due to the cable's resistance and strong magnetic field degradation with distance from the source, cables with conventional conductors require a big power source. For this purpose, High Temperature Superconducting cable is appropriate. We established a requirement for the cable's maximum current of 200 kA and its length of 1200 m set on a seabed at a depth of 12 m. Our most recent cable design is made up of a rare-earth-barium-copper-oxide tape conductor stack that has been bundled and cooled to 50 K with helium gas. As a next step, cooling to 20 K using the same basic concept of cable is shown to reduce the high cost of the tape conductor.