A pre-cast, copper, segment for the production of an accelerating cell of a 3 GHz electron accelerator. These accelerators were developed at CRNL as part of a joint CRNL-Commercial Products Division program to develop linear accelerators for the treatment of cancers. The cells are typically machined from 10 cm diameter billets of Oxygen Free High Conductivity (OFHC) copper to very tight tolerances. The machining of this material is very specialized and costly. To reduce the costs, attempts were made to pre-cast the segments in a shape that would reduce the required machining. The casting process, however, was found to introduce an unacceptable level of contamination into the copper. The sample measures 10 cm in diameter and is 3 cm in thickness.
