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Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.
Sawamura, Masaru; Furuya, Takaaki*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Takahashi, Takeshi*; Umemori, Kensei*; Sakai, Hiroshi*; Shinoe, Kenji*
Proceedings of 2007 Particle Accelerator Conference (PAC '07) (Internet), p.1022 - 1024, 2007/06
An eccentric-fluted beam pipe was proposed to damp quadrupole modes. The eccentric-flute acts as a mode converter from quadrupole to dipole. Optimized parameters permit to damp both degenerate modes of quadrupole with the eccentric-flute. External Q-values measured with a low power model agreed well with those calculated with MAFIA.
Sakai, Hiroshi*; Shinoe, Kenji*; Furuya, Takaaki*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Takahashi, Takeshi*; Umemori, Kensei*; Sawamura, Masaru
Proceedings of 41st Advanced ICFA Beam Dynamics Workshop on Energy Recovery Linacs (ERL '07) (CD-ROM), p.56 - 61, 2007/05
For the energy recovery linacs (ERLs), strong higherorder-mode (HOM) damping is necessary to achieve high current operations. For this purpose, we have newly designed a 1.3 GHz 9-cell superconducting cavity. The cell shape of this cavity is designed and optimized for the high current ERL operation. The HOMs are extracted through the beam pipes and damped with RF absorbers. Furthermore, an idea of eccentric-fluted beam pipe (EFB) is proposed in order to extract the quadrupole HOMs. In this paper, strategy for the HOM suppression to optimise for the ERL operation and estimated HOM characteristics are described. Other important R&D items are also reported.
Umemori, Kensei*; Furuya, Takaaki*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Takahashi, Takeshi*; Sakai, Hiroshi*; Shinoe, Kenji*; Sawamura, Masaru
Proceedings of 4th Asian Particle Accelerator Conference (APAC 2007) (CD-ROM), p.570 - 572, 2007/01
no abstracts in English
Sawamura, Masaru; Umemori, Kensei*; Furuya, Takaaki*; Sakanaka, Shogo*; Takahashi, Takeshi*; Suwada, Tsuyoshi*; Sakai, Hiroshi*; Shinoe, Kenji*
Proceedings of 4th Annual Meeting of Particle Accelerator Society of Japan and 32nd Linear Accelerator Meeting in Japan (CD-ROM), p.472 - 474, 2007/00
An eccentric-fluted beam pipe has been proposed to damp quadrupole modes. The eccentric-flute acts as a mode converter from quadrupole to dipole. Optimized parameters permit to damp both degenerate modes of quadrupole with the eccentric-flute. External Q-values measured with a low power model agree well with those calculated with MAFIA.
Sawamura, Masaru; Umemori, Kensei*; Furuya, Takaaki*; Takahashi, Takeshi*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Sakai, Hiroshi*; Shinoe, Kenji*
no journal, ,
no abstracts in English
Sawamura, Masaru; Umemori, Kensei*; Furuya, Takaaki*; Takahashi, Takeshi*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Sakai, Hiroshi*; Shinoe, Kenji*
no journal, ,
no abstracts in English
Sakai, Hiroshi*; Shinoe, Kenji*; Umemori, Kensei*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Takahashi, Takeshi*; Furuya, Takaaki*; Sawamura, Masaru
no journal, ,
Development for energy-recovery linacs (ERLs) of the next generation light sources has begun in 2006. Superconducting cavities for the main linac is one of the essential technologies. The main linac has to accelerate and decelerate the high current beam of 100 mA stably. We present the design and development of the input couplers for the main linacs.
Umemori, Kensei*; Sakai, Hiroshi*; Sakanaka, Shogo*; Sawamura, Masaru; Shinoe, Kenji*; Suwada, Tsuyoshi*; Takahashi, Takeshi*; Furuya, Takaaki*
no journal, ,
We have been developing a 1.3-GHz superconducting cavity which is one of the essential components for energy-recovery linacs (ERLs). The ERL requires the accelerating gradient of 15-20 MV/m and CW beam operation of 100 mA. Damping of higher order modes is important for high current beam accelerators such as ERLs. We designed a new cavity of large iris diameter, ellipsoidal shape of equator and large beam pipe diameter to reduce the impedance of dipole modes. We also proposed eccentric-fluted beam pipe to damp quadrupole modes. The model cavities were manufactured and surface-treated. We report results of vertical measurement.
Sawamura, Masaru; Umemori, Kensei*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Takahashi, Takeshi*; Furuya, Takaaki*; Noguchi, Shuichi*; Kako, Eiji*; Shishido, Toshio*; Watanabe, Ken*; et al.
no journal, ,
Superconducting accelerator cavities are essential for the energy-recovery linac. The superconducting cavities are used in an injector and a main linac. A new model has been designed for the ERL. A center-single-cell cavity, an end-single-cell cavity and 9-cell cavity have been constructed. Vertical tests were performed for the center-single-cell cavity and the end-single cell cavity. A 2-cell cavity for the injector is under construction.
Nishimori, Yuya*; Akashi, Tomoyasu*; Uwada, Shogo*; Matsumoto, Tatsuya*; Liu, W.*; Morita, Koji*; Takamatsu, Kuniyoshi
no journal, ,
A new RCCS with passive safety features consists of two continuous closed regions. One is a region surrounding RPV. The other is a cooling region with heat transferred to the ambient air. The new RCCS needs no electrical or mechanical driving devices. We started experiment research with using a scaled-down test section for understanding effect of expansion of heat transfer areas of the cooling region on cooling performance and heat transfer characteristics. For example, two experiments with and without insulation covering a part of the heat transfer area of the cooling region were performed. As a result, in the case of the experiment without the insulation, the heater power could be increased; therefore, it is effective for an actual RCCS to increase heat transfer areas.
