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Title |
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| MOZBAB01 |
Review of the Worldwide SASE FEL Development
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89 |
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- T. Shintake
RIKEN Spring-8 Harima, Hyogo
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Talk will review the worldwide efforts towards VUV and X-ray SASE FELs,including low emittance electron source, linear accelerator, bunch compressor, undulator, beam diagnostics, alignment, and control, facility building and seeding technology.
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Slides
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| TUPMN043 |
Graphite Heater Optimized for a Low-emittance CeB6 Cathode
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1013 |
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- K. Togawa, A. Higashiya, T. Shintake
RIKEN Spring-8 Harima, Hyogo
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We developed a thermionic cathode assembly using a single-crystal CeB6 emitter for the x-ray free electron laser project at SPring-8. The CeB6 cathode has excellent emission properties, i.e., smooth surface, high emission density, uniform emission density, and high resistance to contamination. A cylindrical graphite heater was developed to heat the cathode up to the operational temperature as high as 1800 K. At this temperature, a 500 keV pulsed electron beam with more than 1 A peak current can be extracted from the small surface area (3 mm diameter). In this conference, we will report the design detail and operational experience of the graphite heater for the CeB6 cathode.
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| WEPMN022 |
High Gradient Tests of C-band Accelerating System for Japanese XFEL Project
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2095 |
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- K. Shirasawa, T. Inagaki, H. Kitamura, T. Shintake
RIKEN Spring-8 Harima, Hyogo
- H. Baba, H. Matsumoto
KEK, Ibaraki
- S. Miura
MHI, Hiroshima
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The C-band (5712 MHz) choke-mode type accelerating structure will be used for SCSS. Since the C-band accelerator generates higher accelerating gradient than traditional S-band accelerator, it makes the machine size compact and the cost low. In order to confirm the performance of the C-band accelerating system for the 8 GeV XFEL machine, the system including the same accelerating structure and RF system have been installed in the SCSS prototype accelerator. In the prototype machine, four 1.8 m long C-band accelerating structures are used to accelerate electron up to 250 MeV. From November 2005, we have operated the C-band accelerator in the prototype machine with no serious problem. After the RF conditioning, accelerating gradient up to 35 MV/m was achieved. Since a lot of C-band accelerator units, about 70 klystrons and 130 accelerating structures, will be used for 8 GeV XFEL machine, it is necessary to investigate the damage due to the beam operation. Therefore, we plan to observe the inside of the accelerating structure and pulse compressor in early 2007. In this paper, we will report on the achieved performance and the inside observation of the C-band accelerator.
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| THPMN026 |
C-band Linac in SCSS Prototype Accelerator of the Japanese X-FEL Project
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2766 |
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- T. Inagaki, T. Shintake, K. Shirasawa
RIKEN Spring-8 Harima, Hyogo
- H. Baba, H. Matsumoto
KEK, Ibaraki
- A. Miura
Nihon Koshuha Co., Ltd., Yokohama
- S. Miura
MHI, Hiroshima
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Funding: RIKEN-JASRI Joint-Project for SPring-8 XFEL
C-band (5712-MHz) linac is used as the main accelerator of the Japanese X-FEL facility in SPring-8. Since the C-band linac has high acceleration gradient, our 8-GeV accelerator is compact rather than a conventional S-band accelerator. The system consists of following components; two choke-mode-type 1.8-m accelerating structures, an rf pulse compressor (SLED), a 50-MW klystron, a 100-MW compact modulator, and an rf digital control system. We will use 60 to 70 units for the X-FEL accelerator. Since November 2005, we have operated two C-band units in the 250-MeV FEL prototype accelerator (SCSS). After rf conditioning, the accelerating gradient was achieved to 35-MV/m. We successfully accelerated the electron beam by this gradient of electrical field. In this presentation, we will report the detail of each component and its operation status of the SCSS prototype accelerator.
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