  In the RHIC forward (RHICf) experiment, an operation with pp collisions was
performed at $\sqrt{s}\,=\,$510 GeV from 24-27 June 2017. The performances,
energy and position resolutions, trigger efficiency, stability, and background
during the operation, have been studied using data and simulations, which
revealed that the requirements for production cross-section and transverse
single-spin asymmetry measurements of very forward photons, $\pi^0$s, and
neutrons were satisfied. In this paper, we describe the details of these
studies.
