  In the last decade ground-based Imaging Atmospheric Cherenkov Telescopes have
discovered roughly 30 pulsar wind nebulae at energies above 100 GeV. We present
first results from a leptonic emission code that models the spectral energy
density of a pulsar wind nebula by solving the Fokker-Planck transport equation
and calculating inverse Compton and synchrotron emissivities. Although models
such as these have been developed before, most of them model the geometry of a
pulsar wind nebula as that of a single sphere. We have created a
time-dependent, multi-zone model to investigate changes in the particle
spectrum as the particles diffuse through the pulsar wind nebula, as well as
predict the radiation spectrum at different positions in the nebula. We
calibrate our new model against a more basic previous model and fit the
observed spectrum of G0.9+0.1, incorporating data from the High Energy
Stereoscopic System as well as radio and X-ray experiments.
