  Bulk polycrystalline HgBa(2)Ca(2)Cu(3)O(x) materials were irradiated with 0.8
GeV protons to form randomly oriented columnar defects, by induced fission of
Hg-nuclei. Proton fluences from 0 to 35 times 10^{16} cm^{-2} were used to
install defects with area densities up to a "matching field" of 3.4 Tesla.
Studies were conducted on the dependence of the equilibrium magnetization and
the intragrain persistent current density on temperature and applied magnetic
field, at various defect densities. The magnetization was modeled using London
theory with the addition of vortex-defect interactions.
