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Kobayashi, Tetsuya; Chishiro, Etsuji; Anami, Shozo*; Yamaguchi, Seiya*; Michizono, Shinichiro*
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.320 - 322, 2004/08
J-PARC (Japan Proton Accelerator Complex) linac, which is 300 m long, consists of 324 MHz accelerating section of the upstream and 972 MHz section (as future plan) of the downstream. In the klystron gallery, totally about 60 RF source control stations will stand for the klystrons and solid-state amplifiers. The error of the accelerating field must be within 
1 degree in phase and 1% in amplitude. Thus, the high phase stability is required to the RF reference for all of the low-level RF control systems and the beam monitor systems. This paper presents a final design and the summary of the performance evaluation of the RF reference distribution system including the timing control signal distribution for this linac.
Kobayashi, Tetsuya; Chishiro, Etsuji; Anami, Shozo*; Yamaguchi, Seiya*; Michizono, Shinichiro*
Proceedings of 22nd International Linear Accelerator Conference (LINAC 2004), p.727 - 729, 2004/00
J-PARC (Japan Proton Accelerator Complex) linac, which is 300 m long, consists of 324 MHz accelerating section of the upstream and 972 MHz section (as future plan) of the downstream. In the klystron gallery, totally about 60 RF source control stations will stand for the klystrons and solid-state amplifiers. The error of the accelerating field must be within 1 degree in phase and 1% in amplitude. Thus, the high phase stability is required to the RF reference for all of the low-level RF control systems and the beam monitor systems. This paper presents a final design of the RF reference distribution system for this linac. Our objective for the phase stability of the reference aims at less than 0.3 degrees at a 972 MHz frequency.
Kobayashi, Tetsuya; Chishiro, Etsuji; Anami, Shozo*; Yamaguchi, Seiya*; Michizono, Shinichiro*
Proceedings of 28th Linear Accelerator Meeting in Japan, p.366 - 368, 2003/08
For the J-PARC linac, a 12-MHz RF reference is distributed to 60 low-level RF control systems of klystron stations through optical links. The error of the accelerating field must be within +/- 1 degree in phase and +/ 1% in amplitude. Thus, a very high phase stability (within +/- 0.3 degree in phase) is required to the reference distribution system. New optimized optical components for this linac were developed and the performance of them was tested. The results will be reported. In adition, the timing control signal distribution system for the linac will be illustlated.
Kobayashi, Tetsuya; Chishiro, Etsuji; Anami, Shozo*; Yamaguchi, Seiya*; Michizono, Shinichiro*
Proceedings of 27th Linear Accelerator Meeting in Japan, p.302 - 304, 2002/08
For the high-intensity proton linac of the KEK/JAERI joint project, the error of the accelerating field must be within 1 degree in phase and 1% in amplitude. Thus high phase stability is required to the RF reference distribution system. The 12 MHz RF reference is converted to optical signal and distributed to 50 low level RF control systems of klystron and solid-state amplifier stations through the optical fiber links (E/O, O/E and optical fibers). The phase-stabilized optical fiber (PSOF) will be used as an optical transfer line. Characteristics of the optical components (E/O, O/E, PSOF) are measured. The performance of the conventional E/O and O/E is not enough for the requirements. New optimized E/O and O/E for this linac are going to be produced. The total stability of the RF reference transfer system with new optical components will be evaluated.