Fabrication and Cold Test of a 9-MeV C-Band Accelerating Column

A 9-MeV electron linear accelerator based on C-band microwaves for medical applications is being assembled at the Dongnam Institute of Radiological and Medical Sciences (DIRAMS). The accelerating column has an on-axis coupled structure and will be operated with a π /2-mode standing wave. Parameters of the cavities are selected based on simulations with CST MICROWAVE STUDIO® (CST MWS), and the cold test and micro-machining are performed to obtain the desired RF characteristics of the cavity. Then, the bead-pull test is conducted to measure the RF properties of the full accelerating column structure. The fabrication of the C-band accelerating column and the results of the low-power RF tests are discussed.