  Beam cooling enables an increase of peak and average luminosities and
significantly expands the discovery potential of colliders; therefore, it is an
indispensable component of any modern design. Optical Stochastic Cooling (OSC)
is a high-bandwidth, beam-cooling technique that will advance the present
state-of-the-art, stochastic cooling rate by more than three orders of
magnitude. It is an enabling technology for next-generation, discovery-science
machines at the energy and intensity frontiers including hadron and
electron-ion colliders. This paper presents the status of our experimental
effort to demonstrate OSC at the Integrable Optics Test Accelerator (IOTA)
ring, a testbed for advanced beam-physics concepts and technologies that is
currently being commissioned at Fermilab. Our recent efforts are centered on
the development of an integrated design that is prepared for final engineering
and fabrication. The paper also presents a comparison of theoretical
calculations and numerical simulations of the pickup-undulator radiation and
its interaction with electrons in the kicker-undulator.

Accelerator Physics