  The magnetic monopole in euclidean pure SU(2) gauge theory is investigated
using a background field method on the lattice.
  With Monte Carlo methods we study the mass of the monopole in the full
quantum theory.
  The monopole background under the quantum fluctuations is induced by imposing
fixed monopole boundary conditions on the walls of a finite lattice volume.
  By varying the gauge coupling it is possible to study monopoles with scales
from the hadronic scale up to high energies.
  The results for the monopole mass are consistent with a conjecture we made
previously in a realization of the dual superconductor hypothesis of
confinement.
