Author: Joung, M.J.
Paper Title Page
WEPMB034 Analysis of Niobium Quality Control for SRF Cavity 2197
  • M.J. Joung
    IBS, Daejeon, Republic of Korea
  Funding: the Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) of the Republic of Korea under Contract 2013M7A1A1075764.
Clean and smooth surface is important to get low sur-face resistance for superconducting material. SRF (Super-conducting Radio Frequency) cavity made of niobium which is superconducting material and also one of the rare metal. The procedure of niobium quality control was set up to get high performance SRF cavity. The procedure consists of three parts; certificates check, Nb specification verification, and surface inspection and measurements of thickness, roughness, flatness. Three important properties which are RRR value, chemical composition and me-chanical properties were verified to conform Nb specifica-tion. The range of thickness, roughness and flatness for niobium as SRF cavity raw material were obtained by measurement.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB034  
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WEPMB036 High Pressure Rinsing for Niobium Superconducting Cavity 2202
  • Y. Jung, M.J. Joung, M. Lee
    IBS, Daejeon, Republic of Korea
  • J. Lee, J. Seo
    Vitzrotech Co., Ltd., Ansan City, Kyunggi-Do, Republic of Korea
  Niobium superconducting cavity is treated with high pressure rinsing to clean the inner surface of the cavity. Either organic or inorganic residues on the inner surface of the cavity can cause serious problems during the cavity operation. A thermal quenching - superconducting material loses its superconductivity - is a typical phenomenon brought out by harmful defects by increasing critical temperature. We have performed high pressure rinsing experiments to check out a prototype HPR machine. HPR experiments were performed with a simplified cavity structure, and analyzed as a function of the pressure, the distance from a nozzle, and the sizes of defects on the niobium surface. In this presentation, we will discuss the performance of the prototype HPR machine.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMB036  
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