U.S. industrial fabrication of a 5-cell superconducting radio frequency (SCRF) cavity

In 1998, a 5-cell, β=0.64, 700 MHz superconducting cavity was manufactured by Advanced Energy Systems Inc. (AES) Medford, NY (figure 1). This work was performed under contract to Los Alamos National Laboratory (LANL) through Burns and Roe Enterprises, in association with General Atomics, utilizing customer provided RRR>250 niobium and fabrication tooling. This paper will describe the fabrication process including development of a hydroforming process for a half cell forming and manufacturing of beam tubes. Testing of the cavity was recently performed at the Jefferson Laboratory cryogenic facility where it exceeded specifications by reaching an E_acc of 9.5 MV/m at a Q of 3×10¹⁰ with no detectable field emission