As an approximate Goldstone boson with zero quantum number and zero standard model charge, the long-lived \(\eta\) meson exhibits the decay processes that offer a unique opportunity to explore physics beyond the standard model and new sources of charge parity violation. Further, they facilitate the testing of the low-energy quantum chromodynamics theory and measurement of the fundamental parameters of light quarks. To pursue these goals, we propose a plan to construct a super \(\eta\) factory at HIAF high-energy terminal or at CiADS after its energy upgrade. The high-intensity proton beam at HIAF enables the production of many \(\eta\) samples, exceeding \(10^{13}\) events per year during the first stage, utilizing multiple layers of thin targets composed of light nuclei. This paper presents the physics goals, the first-version conceptual design of the spectrometer, and preliminary simulation results.
