  We study anomaly mediated supersymmetry breaking in type IIB string theory
and use our results to test the supergravity formula for anomaly mediated
gaugino masses. We compute 1-loop gaugino masses for models of D3-branes on
orbifold singularities with 3-form fluxes by calculating the annulus correlator
of 3-form flux and two gauginos in the zero momentum limit. Consistent with
supergravity expectations we find both anomalous and running contributions to
1-loop gaugino masses. For background Neveu-Schwarz H-flux we find an exact
match with the supergravity formula. For Ramond-Ramond flux there is an
off-shell ambiguity that precludes a full matching. The anomaly mediated
gaugino masses, while determined by the infrared spectrum, arise from an
explicit sum over UV open string winding modes. We also calculate
brane-to-brane tree-level gravity mediated gaugino masses and show that there
are two contributions coming from the dilaton and from the twisted modes, which
are suppressed by the full T^6 volume and the untwisted T^2 volume
respectively.
