Development of a break out box system for the 1.5GHz SRF harmonic cavity at NSRRC

This paper presents the design and implementation of a long-term operational monitoring and control module, planned for deployment after 2026 at the base of a 1.5 GHz superconducting passive harmonic cavity (SRF HC) in the TPS storage ring. The proposed system, known as the Break Out Box (BOB), consolidates multifunctional measurement and control capabilities into a compact, modular platform. Its primary objective is to optimize the signal interface of superconducting RF cavities, thereby improving system reliability, responsiveness, and maintainability.