USTC and the STAR collaboration are interested in installing, commissioning, and

operating a "wheel" of CBM TOF detectors mounted on the inside face of the STAR

east pole tip, for the RHIC run periods in 2019-2020. This endcap TOF (time-of

flight) detector would extend STAR's particle identification (PID) in the

intermediate momentum range to at least eta of -1.5. The installation would benefit

CBM by providing a large-scale integration test of the CBM TOF system, including

PID and calibration of the detectors, prior to the installation in CBM and the start of

CBM operations. The installation would benefit STAR by providing critical TOF

coverage for BES II (Beam Energy Scan, Phase II). Both the interested CBM

institutions and STAR will participate in the analysis of the physics data provided by

the CBM TOF detectors and benefit from the study of this data, including authorship

of any publications from this data. PID over the extended rapidity range will greatly

enhance the search for critical behavior. The energy range accessible to the

fixed-target program is also significantly extended. We anticipate that several

important questions of interest to the greater physics community may be answered

by the data provided by this cooperative venture. These potentially important

results would be otherwise unavailable without this endeavor.