| Paper |
Title |
Page |
| TUPKF038 |
Reduced Length Designs of 500 MHz Damped Cavity Using SiC Microwave Absorber
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1048 |
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- T. Koseki
RIKEN/RARF/BPEL, Saitama
- M. Izawa, S. Sakanaka, T. Takahashi, K. Umemori
KEK, Ibaraki
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We present a new 500 MHz HOM (Higher-Order Modes) damped cavity for high brilliance synchrotron radiation sources. The design is based on the damped cavity, which is operated at the Photon Factory storage ring in KEK. The PF cavity has a large hole beam duct (140 mm in diameter), a part of which is made of a silicon carbide (SiC) microwave absorber. The new cavity, proposed in this paper, has parallel-plate radial transmission lines on the beam duct instead of the SiC beam duct. The outer end of the radial line is terminated by SiC absorbers. The HOMs, extracted from the center part of the cavity through the beam duct, propagate in the radial line and are dissipated in the absorber. The accelerating mode is not affected by the radial line damper since the frequency is sufficiently below the cutoff of the 140-mm beam duct. In this paper, optimized design of the radial line damper and damping properties for HOMs are described in detail.
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| WEPKF039 |
The Vacuum System of Super SOR
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1690 |
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- H. Sakai, M. Fujisawa, A. Kakizaki, T. Kinishita, H. Kudo, N. Nakamura, O. Okuda, S. Shibuya, K. Shinoe, H. Takaki
ISSP/SRL, Chiba
- K. Kobayashi
KEK, Ibaraki
- T. Koseki
RIKEN/RARF/BPEL, Saitama
- H. Ohkuma
JASRI/SPring-8, Hyogo
- S. Suzuki
LNS, Sendai
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The Super-SOR light source is a Japanese VUV and soft X-ray third-generation synchrotron radiation source, which consists of 1.8GeV storage ring and injector. The beam current is circulated up to 400mA. These accelerators are designed so as to fully meet requirements for top-up injection. In order to realize these operation modes, our vacuum system are required on following conditions. One is to obtain the long lifetime. The other is not to melt the vacuum chamber by irradiating the high flux synchrotron radiation. Finally beam instability is not occurred by large wake fields. We describe the design of the vaccum chamber of Super-SOR and present the recent R&D concerning this system.
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