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Title |
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| TU201 |
The KEK C-Band RF System for a Linear Collider
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256 |
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- H. Matsumoto, S. Takeda, S.S. Win, M. Yoshida
KEK, Ibaraki
- H. Baba, T. Shintake
RIKEN Spring-8 Harima, Hyogo
- J-O. Oh
PAL, Pohang
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The C-band (5712 MHz) main linac has been developed just motivated by the urgent and essential physics program at the e+e- linear collider. In total ~8000 accelerating structures and ~4000 klystrons with modulators are needed for 500 GeV C.M. energy. Therefore these units have to meet strict requirements for: high reliability, simplicity, easy operation, reasonable power efficiency and low cost. This list provides a guiding principle and the boundary conditions for our design work. We have already developed the conventional and PPM type 50 MW class C-band klystrons, modulators, and HOM-free accelerator structures. The first high power an rf compressor cavity made of a low thermal expansion material was designed to provide stable operation even with a very high Q of 200 k, it was successfully operated an output rf power of 135 MW at KEK. The C-band linac rf-system will be used for the SASE-FEL project at SPring-8, but it will also serve to verify the design and components, which can eventually be deployed for the main linac rf system in a future linear collider.
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Transparencies
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| TU202 |
Low Emittance 500 kV Thermionic Electron Gun
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261 |
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- K. Togawa, H. Baba, T. Inagaki, K. Onoe, T. Shintake, T. Tanaka
RIKEN Spring-8 Harima, Hyogo
- H. Matsumoto
KEK, Ibaraki
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A 500 kV pulsed electron gun has been constructed for the injector system of the SASE-FEL project at SPring-8 (SCSS project). A CeB6 single crystal was chosen as a thermionic cathode, because of its excellent emission properties. We have succeeded in generating a 500 keV beam with 1 A peak current and 3 μs FWHM. The beam was very stable with low jitter. The beam emittance has been measured by means of double-slits method, and the normalized rms emittance of 1.1 π·mm·mrad has been obtained. We report on the experimental result on the emittance measurement of the CeB6 electron gun.
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Transparencies
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