Model test of biperiodic L-support disk-and-washer linac structure

A disk-and-washer (DAW) structure with biperiodic L-support was studied. Al uminum models were fabricated by calculation studies. Information for timin g the frequency was accumulated through cold model measurements. The materi al strength of oxygen free copper (OFC) was measured for the fabrication of the high-power model fabricated with OFC. A load test confirmed that OFC w as enough sufficiently strong for this structure, although the DAW has stru ctural complexity. On the basis of these results, eleven two-cell-units wit h a high-power model cavity made of OFC were fabricated. The accelerating m ode and coupling mode frequencies of the entire structure were evaluated to be -1.1 MHz and -3.5 MHz, respectively, within the operating frequency of 2857 MHz, and +/-2% electric field flatness was achieved. These values are sufficient for the requirements of a high-power model. A detailed design wh ich aimed at electron acceleration was established for the DAW structure wi th biperiodic L-support.