  During 1999, four 700-MHz, medium-beta (b = 0.64), superconducting radio
frequency (SCRF) cavities for a high-intensity proton linac project at Los
Alamos National Laboratory (LANL) were manufactured by industry. The SCRF
cavities were designed by a LANL team in Los Alamos, New Mexico, USA, and
manufactured at a CERCA plant in Romans, France. The cavities were made of
4-mm-thick, solid niobium sheets with a residual resistivity ratio (RRR)
greater than 250. These niobium sheets were supplied by Wah Chang (USA),
Heraeus AG (Germany), and Tokyo Denkai (Japan). The SCRF cavities were shipped
to LANL for performance testing. This paper describes the experience gained
during the manufacturing process at CERCA.
