A new flux concentrator made of Cu alloy for the SuperKEKB positron source

A Flux Concentrator (FC) made of Cu alloy was developed to avoid discharge problem caused by deformation. The alloy has 40 times higher yield strength than that of Oxgen free copper (OFC) after brazing process. Evaluation results of several alloys are described from brazing, mechanical and electrical point of view. Manufacturing process including heat treatment are shown in the following section. Consideration on increase of Ohmic heat due to higher resistance is discussed in detail. The alloy will be a candidate to replace OFC in some application where brazing is necessary and higher yield strength and good electrical conductivity are required. (author)