Refine your search:     
Report No.
 - 
Search Results: Records 1-13 displayed on this page of 13
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Analysis on effects of transverse electric field in an injector cavity of compact-ERL at KEK

Hwang, J.-G.*; Kim, E.-S.*; Miyajima, Tsukasa*; Honda, Yosuke*; Harada, Kentaro*; Shimada, Miho*; Takai, Ryota*; Kume, Tatsuya*; Nagahashi, Shinya*; Obina, Takashi*; et al.

Nuclear Instruments and Methods in Physics Research A, 753, p.97 - 104, 2014/07

 Times Cited Count:7 Percentile:50.1(Instruments & Instrumentation)

Journal Articles

Generation and applications of ultra-short electron beams in energy-recovery linacs

Hajima, Ryoichi; Shimada, Miho*; Nakamura, Norio*

Nuclear Instruments and Methods in Physics Research A, 637(1, Suppl.), p.S37 - S42, 2011/05

 Times Cited Count:2 Percentile:21.25(Instruments & Instrumentation)

Energy-recovery linacs (ERLs) are in operation and under development in the world for future lightsources, which cover a wide range of photon energy, from THz to $$gamma$$-rays, by using various kinds of photo-emission processes, undulator radiation, free-electron lasers, laser Compton scattering (LCS), and coherent radiation. Availability of ultra-short electron beams is an essential feature of ERLs for future light sources. In this paper, we provide an overview of the generation and applications of ultra-short electron beams in ERLs. Magnetic bunch compression and velocity bunching are the two schemes of ultra-short electron beam generation that are presented with the Compact ERL test facility as an example.

Journal Articles

Inverse Compton scattering of coherent synchrotron radiation in an energy recovery linac

Shimada, Miho*; Hajima, Ryoichi

Physical Review Special Topics; Accelerators and Beams, 13(10), p.100701_1 - 100701_5, 2010/10

 Times Cited Count:9 Percentile:56.6(Physics, Nuclear)

We propose inverse Compton scattering (ICS) of coherent synchrotron radiation (CSR) from arelativistic short electron bunch in energy recovery linacs (ERL) as a high-flux subpicosecond X-ray and $$gamma$$-ray source. An advantage of the CSR scheme over a conventional ICS source is that no externallaser is required, and synchronization between CSR pulses and electron bunches is obtained automatically. Moreover, higher-flux X-rays can be generated from the ICS of CSR in an ERL operated at a highrepetition rate, 100 MHz to 1.3 GHz. Using parameters of the Compact ERL at KEK, 1$$times$$10$$^{13-14}$$ phs/sb.w. 10% X-ray with a 100 fs-1 ps pulse duration can beobtained, for an energy range from 0.04 to 4 keV. In the case of a 5-GeV ERL, $$gamma$$ rays with energy aroundtens of MeV are generated with 1$$times$$10$$^{8}$$ phs/pulse b.w. 10% at a repetition rate of several hundredsof MHz.

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

Tolerance study on RF amplitude and phase of main accelerating cavities and injection timing for the compact ERL

Nakamura, Norio*; Miyajima, Tsukasa*; Shimada, Miho*; Kobayashi, Yukinori*; Sakanaka, Shogo*; Hajima, Ryoichi

Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.109 - 111, 2009/08

Tolerance study on RF amplitude and phase of main accelerating cavities and injection timing was performed for the compact ERL with a simulation code "elegant". As a result, it was found that errors of the RF amplitude and phase should be controlled within 0.01% and 0.01 deg. in rms to satisfy requirements for the arrival time and the bunch length at the exit of the 1st arc section in bunch-compression mode. In high-current and low-emittance modes, these control errors can be relaxed to 0.1% and 0.1deg. The injection timing error is allowed up to at least 200 fs, which does not deteriorate the beam quality at the exit of the 1st arc section in all the operation modes.

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

An Intense terahertz radiation source at the Compact ERL

Harada, Kentaro*; Shimada, Miho*; Hajima, Ryoichi

Infrared Physics & Technology, 51(5), p.386 - 389, 2008/05

 Times Cited Count:4 Percentile:26.4(Instruments & Instrumentation)

The Compact ERL is an energy recovery LINAC (ERL) test facility that is planned for KEK. The circumference of the recirculation path will be 70 m. Initially, the beam energy will be about 65 MeV and the current about 10 mA. Although the primary purpose of the machine is to aid the development of the key technologies that are essential for building an ultra-brilliant new synchrotron light source based on an ERL, the Compact ERL itself has great potential as an intense source of terahertz radiation. To generate the intense terahertz radiation, an electron bunch of a very short bunch length is required and bunch compression is inevitable. We discuss the parameters of the Compact ERL, present the results of a simulation of bunch compression, and make an estimate of the generated coherent synchrotron radiation.

Journal Articles

Design study of the compact ERL optics

Shiraga, Takashi*; Nakamura, Norio*; Harada, Kentaro*; Shimada, Miho*; Sakanaka, Shogo*; Kobayashi, Yukinori*; Hajima, Ryoichi

Proceedings of 5th Annual Meeting of Particle Accelerator Society of Japan and 33rd Linear Accelerator Meeting in Japan (CD-ROM), p.589 - 591, 2008/00

An energy recovery linac (ERL) is expected to be the next generation synchrotron radiation source that can provide synchrotron radiation of higher brilliance, shorter pulse and higher coherence than the existing third-generation synchrotron light sources. The compact ERL is planned to be constructed in order to solve some problems in achievement of such synchrotron radiation and to confirm advantages of ERLs. We studied and optimized the compact ERL optics to achieve subpico-second bunch generation and efficient energy recovery and to transport the beam to the beam dump without serious beam loss. The design study of the compact ERL optics was done by using the simulation code Elegant. As a result, we succeeded in obtaining a 40-fs bunch with a charge of 77 pC just after the first TBA cell. Furthermore we could suppress the maximum beam size to less than 8.5 mm even after deceleration.

Oral presentation

Bunch compression at the test ERL in Japan

Shimada, Miho*; Hajima, Ryoichi

no journal, , 

no abstracts in English

Oral presentation

Electron beam optics in the compact ERL

Hajima, Ryoichi; Shiraga, Takashi*; Nakamura, Norio*; Harada, Kentaro*; Shimada, Miho*; Sakanaka, Shogo*; Kobayashi, Yukinori*

no journal, , 

no abstracts in English

Oral presentation

Simulation of a small-emittance beam for the cERL injector

Hajima, Ryoichi; Miyajima, Tsukasa*; Kobayashi, Yukinori*; Sakanaka, Shogo*; Shimada, Miho*

no journal, , 

no abstracts in English

Oral presentation

Design study of beam optics in the compact ERL

Hajima, Ryoichi; Shiraga, Takashi*; Harada, Kentaro*; Shimada, Miho*; Sakanaka, Shogo*; Kobayashi, Yukinori*; Nakamura, Norio*

no journal, , 

no abstracts in English

Oral presentation

Generation and applications of ultrashort electron beams in energy-recovery linacs

Hajima, Ryoichi; Nakamura, Norio*; Shimada, Miho*

no journal, , 

Energy-recovery linac (ERL) is a novel type of accelerator to generate an electron beam of high quality and high average current. In an ERL, an electron beam from an injector is accelerated by time-varying RF field stored in a superconducting linac and the beam is transported to a recirculation loop. After the recirculation loop, the beam is decelerated by the same superconducting linac for the energy recovery. In this talk, challenges for the generation of ultrashort electron bunches in ERLs are discussed, and applications of ultrashort electron bunches from ERLs are presented.

13 (Records 1-13 displayed on this page)
  • 1