Explanipedia

Stable operation of a fully energy-recovered 1-mA-class electron beam at a compact energy-recovery linac Open

Hiroshi Sakai, Dai Arakawa, T. Furuya, K. Haga, M. Hagiwara , et al. · 2025

A compact energy-recovery linac (cERL) has been under development at KEK to drive key accelerator technologies, demonstrate energy recovery under various conditions, and support beam applications. cERL began beam operations in 2013 to crea…

Stable beam operation of approximately 1 mA beam under highly efficient energy recovery conditions at compact energy-recovery linac Open

Hiroshi Sakai, Dai Arakawa, T. Furuya, K. Haga, M. Hagiwara , et al. · 2024

A compact energy-recovery linac (cERL) has been un-der construction at KEK since 2009 to develop key technologies for the energy-recovery linac. The cERL began operating in 2013 to create a high-current beam with a low-emittance beam with …

Radiation transport line for Terahertz Coherent Diffraction Radiation at ERL Test Accelerator in KEK Open

Y. Honda, R. Kato, Miho Shimada, Ryota Takai · 2024

Coherent radiation from a short bunch of electron beams is expected to be utilized as a terahertz (THz) radiation source. We have conducted an investigation on a terahertz source based on coherent diffraction-radiation (CDR) that possesses…

Reconstruction and beam-transport study of the cERL dump line for high-power IR-FEL operation Open

Norio Nakamura, Yasunori Tanimoto, Nao Higashi, Kentaro Harada, Miho Shimada , et al. · 2023

Infrared (IR) SASE-FEL emission was successfully generated for macro pulses of about 1 μs with the maximum repetition rate of 5 Hz at the cERL. In the future, high-power FEL operation will be planned to increase electron bunches drasticall…

Suppression of eddy-current effects in beam injection using a pulsed sextupole magnet with a new ceramic chamber Open

C. Mitsuda, H. Takaki, Ryota Takai, Takashi Nogami, Takashi Uchiyama , et al. · 2022

At the Photon Factory storage ring (PF ring) of the High Energy Accelerator Research Organization (KEK), a pulsed sextupole magnet (PSM) has been used for top-up injection for the first time. Following its successful operation at the KEK, …

Construction and commissioning of mid-infrared self-amplified spontaneous emission free-electron laser at compact energy recovery linac Open

Y. Honda, Masahiro Adachi, Shu Eguchi, Masafumi Fukuda, Nao Higashi , et al. · 2021

The mid-infrared range is an important spectrum range where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) is a promising candidate for a high-power light source with wav…

Construction and Commissioning of Mid-Infrared SASE FEL at cERL Open

Y. Honda, Masahiro Adachi, Shu Eguchi, Masafumi Fukuda, Ryoichi Hajima , et al. · 2021

The mid-infrared range is an important spectrum range where materials exhibit a characteristic response corresponding to their molecular structure. A free-electron laser (FEL) is a promising candidate for a high-power light source with wav…

Construction of an Infrared FEL at the Compact ERL Open

Ryukou Kato, Masahiro Adachi, Shu Eguchi, Ryoichi Hajima, Kentaro Harada , et al. · 2021

The compact Energy Recovery Linac (cERL) has been in operation at KEK since 2013 to demonstrate ERL performance and develop ERL technology. Recently KEK has launched an infrared FEL project with a competitive funding. The purpose of this p…

Injection Section Upgrading with the Septum-Magnet Replacement in KEK-PF Ring Open

C. Mitsuda, Kentaro Harada, Nao Higashi, Tohru Honda, Yukinori Kobayashi , et al. · 2021

In 2015, the water leakage happened at the cooling pipe of the in-vacuum septum magnet installed into the injection point. Because the maintenance of the leakage needed the total replacement of the magnet, the water circulation was stopped…

Operational Status of Photon Factory Light Sources Open

Tohru Honda, Yukinori Kobayashi, C. Mitsuda, Shinya Nagahashi, Ryota Takai , et al. · 2021

One of the recent topics of Photon Factory light sources, PF-ring and PF-AR, is a construction of a GeV-class beamline for testing detectors at the PF-AR. The bremsstrahlung photons generated by a thin carbon wire are brought to a copper t…

Newly Development of Ceramics Chamber with Integrated Pulsed Magnet for Super-Narrow Bore in KEK-PF Open

C. Mitsuda, Kengo Hamaji, Kentaro Harada, Koichi Iwamoto, Yukinori Kobayashi , et al. · 2021

Ceramics chamber with integrated pulsed magnet (CCiPM) is a new air-core type magnet that has a plan to be used as a multipole injection magnet, a dipole injection kicker, and a fast correction kicker in the next-generation light source. T…

Magnetic Field Measurement and Beam Performance Test of Ceramics Chamber with Integrated Pulsed Magnet at KEK-PF Open

Yao Lu, Kentaro Harada, Yukinori Kobayashi, C. Mitsuda, Shinya Nagahashi , et al. · 2021

An air-core magnet named Ceramics Chamber with integrated Pulsed Magnet(CCiPM) is being developed at the photon factory of KEK(KEK-PF), which will have several applications for the future light source. One prototype has been developed as a…

Stimulated emission of THz coherent diffraction radiation in an optical cavity by a multibunch electron beam Open

Y. Honda, A. Aryshev, R. Kato, Tsukasa Miyajima, T. Obina , et al. · 2019

Accelerator-based terahertz (THz) radiation has been expected to realize a highpower broad-band source. Employing a low-emittance and short-bunch electron beam at a high repetition rate, a scheme to resonantly excite optical cavity modes o…

Accelerator Implementing Development of Ceramics Chamber with Integrated Pulsed Magnet for Beam Test Open

C. Mitsuda, Teruo Honiden, Yukinori Kobayashi, Shinya Nagahashi, Tatsuro Nakanishi , et al. · 2019

We advance the development of Ceramics Chamber Integrated Pulsed Magnet (CCIPM) of air-core type as the application to low emittance ring with a narrow bore of light source accelerator in the future. The CCIPM is composed of ceramics cylin…

1 mA Stable Energy Recovery Beam Operation with Small Beam Emittance Open

T. Obina, Dai Arakawa, Masato Egi, T. Furuya, K. Haga , et al. · 2019

A compact energy-recovery linac (cERL) have been operating since 2013 at KEK to develop critical components for ERL facility. Details of design, construction and the result of initial commissioning are already reported*. This paper will de…

New Industrial Application Beamline for the cERL in KEK Open

Yu Morikawa, K. Haga, M. Hagiwara, Kentaro Harada, Nao Higashi , et al. · 2019

The new beam line for the industrial applications is constructed at the cERL (compact Energy Recovery LINAC) in KEK. In these applications, only north straight sections of cERL consisting of injector and main LINAC will be used. The test f…

Evaluation of the Transverse Impedanse of Pf in-Vacuum Undulator Using Local Orbit Bump Method Open

Olga Tanaka, Masahiro Adachi, Kentaro Harada, R. Kato, Norio Nakamura , et al. · 2019

When a beam passes through insertion devices (IDs) with narrow gap or beam ducts with small aperture, it receives a transverse kick from the impedances of those devices. This transverse kick depends on the beam trans-verse position and bea…

Present Status of the PF-ring and PF-AR Operations Open

Ryota Takai, Tohru Honda, Yukinori Kobayashi, Shinya Nagahashi · 2019

The Photon Factory at KEK has been managing two synchrotron radiation sources, the PF-ring and PF-AR, for over 30 years. Although their operation time has been decreasing in recent years for budget reasons, continuous efforts to improve th…

Stimulated Excitation of an Optical Cavity by a Multibunch Electron Beam via Coherent-Diffraction-Radiation Process Open

Y. Honda, Miho Shimada, A. Aryshev, R. Kato, Tsukasa Miyajima , et al. · 2018

With a low emittance and short-bunch electron beam at a high repetition rate realized by a superconducting linac, stimulated excitation of an optical cavity at the terahertz spectrum range is shown. The electron beam passes through small h…

Impedance evaluation of in-vacuum undulator at KEK Photon Factory Open

Olga Tanaka, Norio Nakamura, T. Obina, K. Tsuchiya, Ryota Takai , et al. · 2018

The estimate of impedance and kick factors of the recently installed at KEK Photon Factory (PF) four In-Vacuum Undulators (IVU) is currently a very important issue, because they could be considerable contributors to the total impedance of …

Beam Based Measurement of Injection Parameters at KEKPF Open

K. Hirano, Kentaro Harada, N. Higashi, Shinya Nagahashi, Akira Ueda , et al. · 2018

Photon Factory storage ring (PF-ring) is the 2.5 GeV synchrotron radiation light source in KEK. After the earthquake hit in 2011, the injection efficiency using the conventional pulsed kicker and septum system has decreased. The primary ca…

New halo formation mechanism at the KEK compact energy recovery linac Open

Olga Tanaka, Norio Nakamura, Miho Shimada, Tsukasa Miyajima, Akira Ueda , et al. · 2018

The beam halo mitigation is a very important challenge for reliable and safe operation of a high-energy machine. A systematic beam halo study was conducted at the KEK compact energy recovery linac (cERL) since non-negligible beam loss was …

Development and Present Status of Photon Factory Light Sources Open

Tohru Honda, Yukinori Kobayashi, Shinya Nagahashi, Ryota Takai · 2018

Photon Factory of KEK manages two light sources, Photon Factory storage ring (PF-ring) and Photon Factory Advanced Ring (PF-AR) with an energy of 2.5 GeV and 6.5 GeV, respectively. Although it is unfortunate that the operation time of the …

Low Emittance Lattice for PF-AR Open

Nao Higashi, Kentaro Harada, Kota Hirano, Shinya Nagahashi, Norio Nakamura , et al. · 2018

PF-AR is a synchrotron-type 6.5 GeV light source in KEK. The user-run was started in 1987, and the lattice is almost the same as the original one. Now we consider the emittance improvement to enlarge the horizontal tune advance in the norm…

Beam tuning and bunch length measurement in the bunch compression operation at the cERL Open

Y. Honda, Miho Shimada, Tsukasa Miyajima, Takahiro Hotei, Norio Nakamura , et al. · 2017

Construction and commissioning of direct beam transport line for PF-AR Open

Nao Higashi, Seiji Asaoka, K. Furukawa, K. Haga, Kentaro Harada , et al. · 2017

PF-AR was constructed as an accumulator ring for TRISTAN, and in the KEKB era it has been revitalized as a 6.5 GeV synchrotron radiation source. The injection energy was 3 GeV and the beam was accelerated to 6.5 GeV prior to the user run. …

A New Stripline Kicker for PF-AR Transverse Feedback Damper Open

Ryota Takai, Tohru Honda, Takashi Nogami, T. Obina, Yasunori Tanimoto , et al. · 2017

A feedback damper equipped with a long stripline kicker was used to damp transverse beam oscillation at the Photon Factory Advanced Ring (PF-AR), which is a 6.5-GeV synchrotron radiation source of KEK. Recently, the stripline kicker was re…

Resonant Coherent Diffraction Radiation System at ERL Test Accelerator in KEK Open

Y. Honda, A. Aryshev, R. Kato, Tsukasa Miyajima, T. Obina , et al. · 2017

An Energy Recovery Linac can produce a low emittance and short bunch beam at a high repetition rate. A test accelerator, compact-ERL, has been operating in KEK for development works of technologies related to ERL and CW-Superconducting acc…

60 pC Bunch Charge Operation of the Compact ERL at KEK Open

Tsukasa Miyajima, Ryoichi Hajima, Kentaro Harada, Y. Honda, Takahiro Hotei , et al. · 2017

The compact ERL (cERL) at KEK was operated in March 2017 to demonstrate generation, acceleration and transportation of the target bunch charge of 60 pC without energy recovery. However, the maximum bunch charge was limited to 40 pC due to …

Bunch Compression at the Recirculation Loop of the Compact ERL Open

Miho Shimada, Kentaro Harada, Y. Honda, Tsukasa Miyajima, Norio Nakamura , et al. · 2016

The compact Energy Recovery Linac (cERL) has been operated as a test facility for the future light-source since 2013. One of the targets of the beam commissioning of this winter is demonstration of bunch compression. The bunch has energy c…

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