H. Ao, Y. Iwashita, T. Shirai, A. Noda, M. Inoue* (ICR, Kyoto Univ.), T. Kawakita, K. Ohkubo, K. Nakanishi (Mitsubishi Heavy Industries, Ltd.)
The biperiodic L-support Disk-and-Washer (DAW) structure for electron acceleration has been studied. The DAW structure has features in high stability, good vacuum properties and high shunt impedance. The high power model of DAW consists of two 1.2m long accelerating tubes. Each accelerating tube has 25 accelerating gaps, and a coaxial bridge coupler connects them. The coaxial bridge coupler has an RF coupler, vacuum port, and three frequency tuners. The dimensions of bridge coupler were optimized with frequency measurement separately. The operating frequency is designed at 2857MHz so that it can replace one of three existing disc-loaded tubes. The dimensions of DAW structure part were optimized by 2-D (SUPERFISH) and 3-D (MAFIA) calculations and aluminum model measurements. All of the parts are made of OFC for the high power model. The test measurement of the high power model, which includes 25 accelerating gaps, confirmed the prospect for the final design properties. Some fabrication techniques and measurement details will be described.
*Research Reactor Institute, Kyoto Univ.
* The full list of the 'VEPP-5 Team' authors (BINP) is presented in the report 'Test of Accelerating Structure for VEPP-5 Preinjector' on these conference.
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