  The galaxy cluster Abell 2152 is recently found to be forming a
cluster-cluster system with another, more distant cluster whose core is almost
perfectly aligned to that of A2152. We discuss the detectability of
microlensing events where a single star in the source cluster behind A2152 is
extremely magnified by an intracluster compact object in A2152. We show that a
search with an 8m-class telescope with a wide field of view, such as the
Subaru/Suprime-Cam, can probe intracluster compact objects with a wide mass
range of m_{co} ~ 10^{-5}-10^{10} M_sun, including ranges that have not yet
been constrained by any past observations. We expect that the event rate is
biased for the background cluster than the foreground cluster (A2152), which
would be a unique signature of microlensing, making this experiment
particularly powerful. The sensitivity of this experiment for the mass fraction
of compact objects would be 1-10% in the total dark matter of the cluster,
which is roughly constant against m_{co}, with a reasonable telescope time for
large telescopes (~10 nights). Therefore any compact objects in this mass range
can be detected or rejected as the dominant component of the dark matter. About
10 events are expected if 20% of the cluster mass is in a form of compact
objects with M ~ 1 M_sun, as claimed by the MACHO collaboration for the Milky
Way halo. Other possibly detectable targets include intracluster stars stripped
by galaxy interactions, and hypothetical very massive black holes (M >~ 100
M_sun) produced as remnants of the first generation stars, which might be
responsible for the recently reported excess of the cosmic infrared background
radiation that seems impossible to explain by normal galactic light.
