Measurements on Superconducting Nb Prototype Structures at 1300 MHz

Twenty-four low temperature measurements have been made on six different superconducting Nb cavities at 1300 NHz. These cavities were fabricated using Nb sheet and electron-beam welding and were processed using ultra-high-vacuum firing. Unloaded Q's as high as 4 × 109 and peak surface electric fields as high as 16 MV/m have been achieved.