• H. Umezawa, K. Takeuchi
  Tokyo Denkai Co., Ltd., Tokyo
• F. Furuta, T. Konomi, K. Saito
  KEK, Ibaraki
• K. Nishimura
  TKX Corporation, Osaka

KEK and Tokyo Denkai have developed new niobium ingot slicing technique. 150 pieces of the large grain niobium discs can be sliced in two days by using of this technique. Tokyo Denkai installed the slicing machine in December 2009. During the development of the slicing technique, we found that crystal growth mechanism in Electron Beam Melting. It gave us the suggestion to make a single crystal niobium ingot. This paper describes the production process of low cost and short production time niobium discs and single crystal niobium ingot development.