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Journal Articles

Recent progress in the energy recovery linac project in Japan

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.

Journal Articles

Progress in R&D efforts on the energy recovery linac in Japan

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.

Journal Articles

Quadrupole HOM damping with eccentric-fluted beam pipes

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.

Journal Articles

Development of a 1.3GHz 9-cell superconducting cavity for the energy recovery linac

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.

Journal Articles

Design of L-band superconducting cavity for the energy recovery linacs

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

Journal Articles

RF characteristic of eccentric-fluted beam pipe

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.

Journal Articles

Report of ERL-2005 Workshop

Hajima, Ryoichi; Suwada, Tsuyoshi*

Hoshako, 18(3), p.200 - 201, 2005/05

no abstracts in English

Oral presentation

Quadrupole HOM damping in superconducting cavities with eccentric-flute

Sawamura, Masaru; Umemori, Kensei*; Furuya, Takaaki*; Takahashi, Takeshi*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Sakai, Hiroshi*; Shinoe, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Superconducting cavity for ERL main linac

Sawamura, Masaru; Umemori, Kensei*; Furuya, Takaaki*; Takahashi, Takeshi*; Sakanaka, Shogo*; Suwada, Tsuyoshi*; Sakai, Hiroshi*; Shinoe, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Development of input coupler for ERL main linacs

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.

Oral presentation

Development of 1.3 GHz superconducting cavity for ERL 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.

Oral presentation

Development for ERL superconducting accelerator cavities

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.

Oral presentation

Increase in the intensity and brightness enhancement of the slow positron beam and its application at the Slow Positron Facility, KEK

Wada, Ken*; Hyodo, Toshio*; Kosuge, Takashi*; Saito, Yuki*; Yagishita, Akira*; Ikeda, Mitsuo*; Osawa, Satoshi*; Suwada, Tsuyoshi*; Furukawa, Kazuro*; Shirakawa, Akihiro*; et al.

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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