  We apply the phenomenological Reggeon field theory framework to investigate
rapidity gap survival (RGS) probability for diffractive dijet production in
proton-proton collisions. In particular, we study in some detail rapidity gap
suppression due to elastic rescatterings of intermediate partons in the
underlying parton cascades, described by enhanced (Pomeron-Pomeron interaction)
diagrams. We demonstrate that such contributions play a subdominant role,
compared to the usual, so-called "eikonal", rapidity gap suppression due to
elastic rescatterings of constituent partons of the colliding protons. On the
other hand, the overall RGS factor proves to be sensitive to color fluctuations
in the proton. Hence, experimental data on diffractive dijet production can be
used to constrain the respective model approaches.
