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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
A Ship Deperming Coil System Using High Temperature Superconducting Cable Technology―Refrigeration―
Author(s)
Megumi Hirota
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DOI:10.17265/2159-5879/2018.01.001
Affiliation(s)
Naval Ship Magnetic & UEP Research Committee, Non-Profit Organization, Tokyo 1130023, Japan
ABSTRACT
The purpose of ship deperming is to reduce its permanent magnetism to
avoid the threat of magnetic sea-mines which appeared first in battlefields in
World War II and stored by many
navies and unanimous groups since then. Magnetic fields for deperming are
mostly generated by electric current through conductor cable and the intensity
of such fields decreases with the distance
from the cable. In order to impose sufficient field to the ship, the deperming
cable is tightly wrapped
around the hull of the ship. A cable with superconducting material as the
conductor is expected to pass high electric current because of its
zero-electric resistivity and has potential to make deperming coil system more
separated from the ship hull. In the previous study, we designed
superconducting coil system set flat on the seabed for ship deperming by
calculating magnetic field generated by the coil based on the characteristic of
HTS (high temperature superconducting) tape
seen in published papers. This time we have kept our design to utilize HTS tape
conductors that are existing and readily available in the open market. In
addition, the limitations of
the manufacturing potential and capacity of the HTS tape conductor industry have been taken into
account for the design. Then we designed the refrigerating system which is to
keep the superconducting property of the cable materials.
KEYWORDS
Deperming, magnetic, ship, refrigeration, helium, radiation, superconducting.
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