XFEL/SPring-8

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1 DEVELOPMENT STATUS OF RF SYSTEM OF INJECTOR SECTION FOR XFEL/SPRING-8 Takao Asaka 1,A), Takahiro Inagaki B), Hiroyasu Ego A), Toshiaki Kobayashi A), Kazuaki Togawa B), Shinsuke Suzuki A), Yuji Otake B), Hirofumi Hanaki A) A) JASRI, XFEL Joint Project / SPring Kouto, Sayo-cho, Sayo-gun, Hyogo , Japan B) RIKEN, XFEL Joint Project / SPring Kouto, Sayo-cho, Sayo-gun, Hyogo , Japan Abstract XFEL/SPring-8 is under construction, which is aiming at generating coherent, high brilliance, ultra-short femtosecond X-ray pulse at wavelength of 1Å or shorter. The injector consists of a 500kV thermionic gun (CeB 6 ) without a control grid, a beam deflecting system, multi-stage RF structures and ten magnetic lenses. The multi-stage RF structures (238MHz, 476MHz, 1428MHz) are used for bunching and accelerating the beam gradually to maintain the initial beam emittance. In addition, in order to realize linearizing the energy chirp of the beam bunch at three magnetic bunch compression systems after the injector system, we prepared extra RF structures of 1428MHz and 5712MHz. It is important to stabilize the gap voltage of those RF structures because the intensity of X-ray pulse is more sensitive for a slight variation of the RF system in the injector. We developed some stable amplifiers for those RF structures, and confirmed the amplitude and phase stability of an RF signal outputted from the amplifiers. The measurement results achieved nearly the requirement of design parameters. In this paper, we describe the development status and the achieved performances of RF equipment of the injector section. XFEL/SPring

2 ± 907

3 Cavity or Structure SHB cav. Booster cav. L-correction cav. L-APS acc. C-correction cav. Frequency 238 MHz 476 MHz 1428 MHz 1428 MHz 5712 MHz Type of Amplifier Solid-state Solid-state + IOT Solid-state Solid-state + Klystron Solid-state + Klystron Output power P out 14 kw 120 kw 10 kw 30 MW 50 MW Pulse width 100 µs 50µs 10µs 6µs 0.5µs Tolerance of P out stability ± 0.02% (σ) ± 0.02% (σ) ± 0.06% (σ) ± 0.02% (σ) ± 0.2% (σ) Tolerance of phase stability ± 0.01 (σ) ± 0.02 (σ) ± 0.06 (σ) ± 0.06 (σ) ± 0.06 (σ) 4.1 Frequency 238 MHz 476 MHz 1428 MHz Type of amplifier Solid-state Solid-state Solid-state Solid-state +IOT Number of amplifier Pulse width 100 µs 50 µs 50 µs 20 µs Repetition rate 60 Hz 60 Hz 60 Hz 60 Hz Input power 1 mw 1 mw 1 kw 1 mw Output power 3.5 kw 2 kw 120 kw 2.5 kw (5.0 kw max.) (2.9 kw max.) (3.5 kw max.) Gain 65.4 db 63 db 20.8 db 64 db Stability of output power 0.011%/min. (std.) 0.026%/min. (std.) 0.052%/min. (std.) Stability of phase 0.02 /10 min. (std.) /min. (std.) /min. (std.) /min. (std.) 908

4 4.2 ±

5 RF input [mw] Output phase [deg] Room & Inside of rack temperature [deg] RF output RF input Coolant temp. Room temp. Inside of rack temp. 20!"%!"$$!"$!"#$!"# %$ #" #$!" RF output [kw] Coolant temperature [deg] [1] T. Shintake,, in these proceedings. [2] H. Hanaki et al.,, in Proceedings of the 5th Annual Meeting of Particle Accelerator Society of Japan, Higashihiroshima, Japan, 2008 pp [3] T. Hara et al.,, in Proceedings of the 4th Annual Meeting of Particle Accelerator Society of Japan, Wako, Japan, 2007 pp [4] H. Tanaka et al.,, in Proceedings of the 4th Annual Meeting of Particle Accelerator Society of Japan, Wako, Japan, 2007 pp [5] H. Maesaka et al.,, in Proceedings of the 4th Annual Meeting of Particle Accelerator Society of Japan, Higashihiroshima, Japan, 2008 pp. -. [6] T. Oshima et al.,, in Proceedings of the 5th Annual Meeting of Particle Accelerator Society of Japan, Higashihiroshima, Japan, 2008 pp [7] T. Shintake et al.,, in Proceedings of the 2nd Annual Meeting of Particle Accelerator Society of Japan, Tosu, Japan, 2005 pp [8] T. Yamamoto et al.,, in these proceedings. 910

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