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Title |
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| MOPC010 |
Injector System for X-ray FEL at SPring-8
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85 |
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- H. Hanaki, T. Asaka, H. Ego, H. Kimura, T. Kobayashi, S. Suzuki
JASRI/SPring-8, Hyogo-ken
- T. Hara, A. Higashiya, T. Inagaki, N. Kumagai, H. Maesaka, Y. Otake, T. Shintake, H. Tanaka, K. Togawa
RIKEN/SPring-8, Hyogo
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The SPring-8 X-FEL based on the SASE process has been developed to generate X-rays of 0.1 nm by the combination of an 8 GeV high gradient linac (400 m) and a mini-gap undulator of in-vacuum type (90 m). The design goals of the slice beam emittance and peak current at the end of the linac are 1 π mm mrad and 3 kA, respectively. The injector of the linac generates an electron beam of 1 nC, accelerates it up to 30 MeV, and compresses its bunch length down to 20 ps step by step. The injector has been designed on the basis of the SCSS test accelerator. We adopted the following keys to toward the goals:- A 500 kV thermionic gun (CeB6) without a control grid ejecting a beam holding the low rms emittance of 1.1 π mm mrad,
- a beam deflector downstream gating the beam to form a bunch of a 1 ns length,
- multi-stage RF structures (238, 476 and 1428 MHz) bunching and accelerating the beam gradually to maintain the initial emittance, and
- extra RF cavities of 1428 and 5712 MHz linearizing the energy chirp of the beam bunch to achieve the bunch compression resulting the required peak current.
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| MOPD010 |
Design of XFEL facility in Harima
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466 |
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- T. Kato, M. Fuse, T. Imagawa, Y. Yamano
Nikken Sekkei Ltd., Tokyo
- S. Itakura, N. Kumagai, K. Oshima, T. Otsuka
RIKEN/SPring-8, Hyogo
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The 700m-long 8 GeV XFEL that was launched by RIKEN is now under construction and will be operational in FY 2010. The strong point of the XFEL facility in Japan is compact under keeping high-performance by applying Spring-8 numerous breakthroughs in accelerator-driven light sources technology. In order to support the high-performance of XFEL, the building was designed with a few architectural ideas. In this paper we introduce the design of building foundation and ground so as to control the transformation of floor which the devices are fixed to, and the design of air conditioning so as to control the temperature change around the devices.
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