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Yamazaki, Yoshishige; Hayashizaki, Noriyosu*; Paramonov, V.*
Proceedings of 21st International Linac Conference, p.752 - 754, 2003/00
The power-handling capability is the critical issue for a high intensity proton linac of normal-conducting coupled-cavity type. In the JAERI/KEK Joint Project, a coupled-cavity linac with the Annular Coupled Structure (ACS) has been developed in order to operate with 3 % duty factor. The ACS accelerating module consists of two ACS tanks and one bridge coupler. The cooling water circuits in the ACS cells ensure the effective and uniform cooling, stabilizing the deviation of cell frequencies. Some of excited cells in the bridge coupler are equipped with fast movable tuners to tune the cavity to the operating frequency. The results of thermal and structural analysis are presented, together with the RF parameter analysis, for different linac regimes. For the adopted ACS module design, the results of the analyses suggest that the operation with the heat loading of up to 90 kW/m is possible, which is corresponding to the 15 % duty factor operation.
Joshi, S. C.*; Paramonov, V.*; Skassyrskaya, A.*; Hayashizaki, Noriyosu*; Ikegami, Masanori*; Yamazaki, Yoshishige
Proceedings of 21st International Linac Conference, p.216 - 218, 2003/00
The normal conducting coupled-cavity linac with the Annular Coupled Structure (ACS) is adopted for 190-400 MeV part of high intensity proton linac for the JAERI/KEK Joint Project. The operating frequency is 972 MHz and the 23 modules will be constructed. The basic configuration is based on that investigated for L-band (1296 MHz) in the previous Japan Hadron Project research. However, the structure design is revised and optimized in order to meet requirements of reliability, operation efficiency and cost reduction for the newly proposed Joint Project. As the results of development, the transverse dimensions of the ACS tank are reduced sufficiently with the improvement in RF characteristics. The structure segmentation and essential points of the design are described.