Investigation of the Effect of Frequency on the Degaussing of High Tc Superconductors
Abstract
Motion in a model maglev train had been impeded by the buildup of
remanent magnetic fields in superconducting YBCO tiles that make
up the train's "roadbed." To solve this problem a 60 Hz a-c current
had been passed through a series of wire loops situated below the
roadbed, thus creating an alternating degaussing magnetic field
which disrupted the problematic remanent fields, resulting in
smoother train motion. The present study is concerned with the
effects of degaussing fields generated at frequencies other than
60 Hz to find possible benefits. Five degaussing frequencies ranging
from 60 to 2000 Hz have been tested. The materials used vary in
their ability to hold an initial remanent field. Results indicate
little frequency dependence in a degaussing field's ability to
eradicate remanent fields. The fields are removed simply as a
function of degaussing field strength.