Integral Radial Stems on Aluminum ß=1 Disk-and-Washer Structures

Aluminum test cavities were manufactured with integral radial stems to support the washers of a ß= 1 2500 MHz disk-and-washer structure. Difficulties in making stem joints were therefore eliminated. From one to four integral stems were studied. Measurements showed that four stem support was best and that two stems mounted at 180° to each other created rf problems. The frequencies of higher order mode passbands can be shifted to result in a structure with good rf efficiency, coupling and quality factor for the π/2 operating mode.