Speaker
Description
Field emission (FE) is one of the main issues limiting the performance of superconducting cavities. Various studies have been conducted to mitigate FE using methods such as computer simulations, microscopic surface analysis, plasma processing, and X-ray or temperature mapping. Among these, X-ray and temperature mapping are the most direct methods for localizing FE emitters. However, due to limitations such as cavity geometry and construction schedules, installing X-ray or temperature mapping system in the RAON Half-Wave Resonators (HWRs) was limited. To address these challenges, this study investigates the FE characteristics of superconducting cavities by primarily utilizing quality factor measurements, without relying on mapping systems. A new parameter was introduced, derived from the field enhancement factor and onset accelerating field, by processing quality factor data to identify the emitter locations. As a result, several FE-related characteristics in RAON HWRs were identified, including changes in emitter behavior due to FE conditioning and the predominant regions where emitters are likely to be located. Surface regions that require focused treatment to reduce FE were identified as well.
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