Ultraprecision cutting of oxygen-free copper for cells in the linear collider -Effects of nitrogen gas and synthetic single crystal diamond tools

The Linear Collider for researching elementary particle physics requires a large number of ultraprecision-machined accelerator cells of oxygen-free copper that have various configurations. In the mass production of the cells, many single crystal diamond tools for ultraprecision cutting are usually consumed, and so it is necessary to improve the life of the diamond tool from a financial viewpoint. Ultraprecision and precision cutting of oxygen-free copper disks have been performed in a nitrogen gas atmosphere and using synthetic single crystal diamond tools in an attempt to extend the life of the diamond tools. The synthetic single crystal diamond tools used in this experiment are generally thought to contain fewer defects because of nitrogen atoms, although they have never been manufactured on a commercial basis.