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View article: Investigating Coherent Smith–Purcell Radiation from Shallow Blazed Gratings: Shading Effect’s Influence on Surface Current Model
Investigating Coherent Smith–Purcell Radiation from Shallow Blazed Gratings: Shading Effect’s Influence on Surface Current Model Open
To evaluate the characteristics of Smith–Purcell radiation, we modified a surface current model to consider the geometrical shading effect of a grating, which was ignored in the original one, and compared it with measurements for a grating…
View article: High Average Current Electron Beam Generation Using RF Gated Thermionic Electron Gun
High Average Current Electron Beam Generation Using RF Gated Thermionic Electron Gun Open
High-current electron beams can significantly enhance the productivity of variety of applications including medical radioisotope (RI) production and wastewater purification. High-power superconducting radio frequency (SRF) linacs are capab…
View article: High Average Current Electron Beam Generation Using RF Gated Thermionic Electron Gun
High Average Current Electron Beam Generation Using RF Gated Thermionic Electron Gun Open
High-current electron beams can significantly enhance the productivity of variety of applications including medical radioisotope (RI) production and wastewater purification. High-power superconducting radio frequency (SRF) linacs are capab…
View article: Amplitude and Phase Control of RF Pulse Using IQ Modulator to Improve Electron Beam Quality
Amplitude and Phase Control of RF Pulse Using IQ Modulator to Improve Electron Beam Quality Open
A test-Accelerator as Coherent Terahertz Source (t-ACTS) has been under development at Tohoku University, in which an intense coherent terahertz radiation is generated from the short electron bunches. Velocity bunching scheme in a travelin…
View article: Study of Coherent Smith–Purcell Radiation in the Terahertz Region Using Ultra-Short Electron Bunches
Study of Coherent Smith–Purcell Radiation in the Terahertz Region Using Ultra-Short Electron Bunches Open
Smith–Purcell radiation (SPR) can be generated nondestructively, providing valuable applications in light sources and beam monitors. Coherent SPR is expected to enable single-shot measurements of very short bunch lengths on the fs scale. S…
View article: Measurement of Coherent Smith-Purcell Radiation Using Ultra-Short Electron Bunch at T-Acts
Measurement of Coherent Smith-Purcell Radiation Using Ultra-Short Electron Bunch at T-Acts Open
The coherent Smith-Purcell radiation (SPR) emitted as a short electron bunch passes over a periodic metal surface is expected to be applied as a non-destructive beam diagnostic tool. The longitudinal profile of the electron bunch can be de…
View article: Light source based on a 100 mm-long monolithic undulator magnet with a very short 4 mm-period length
Light source based on a 100 mm-long monolithic undulator magnet with a very short 4 mm-period length Open
A novel method to fabricate undulator magnets of a-few-millimetre-period length is being explored. Plate-type magnets, 100 mm-long with 4 mm-period length, have been successfully fabricated. They produce an undulator field of approximately…
View article: Characteristics of Polarized Coherent Radiation in Thz Region From a Crossed-Undulator
Characteristics of Polarized Coherent Radiation in Thz Region From a Crossed-Undulator Open
A variable polarized THz light source using a crossed-undulator configuration has been developed at Research Center for Electron Photon Science (ELPH), Tohoku University. It consists of two planar undulators of which deflecting planes cros…
View article: Measurement of Cherenkov Diffraction Radiation from a Short Electron Bunches at t-ACTS
Measurement of Cherenkov Diffraction Radiation from a Short Electron Bunches at t-ACTS Open
Cherenkov Diffraction Radiation (ChDR) can be considered as a tool of non-destructive beam diagnostics. It also has the feature that the photon flux of ChDR is proportional to the thickness of the dielectric used as the radiator and can be…
View article: Status of Test-Accelerator as Coherent THz Source (t-ACTS) at ELPH, Tohoku University
Status of Test-Accelerator as Coherent THz Source (t-ACTS) at ELPH, Tohoku University Open
A test-Accelerator as Coherent Terahertz Source (t-ACTS) has been under development at the Research Center for Electron Photon Science (ELPH), Tohoku University, in which an intense coherent terahertz radiation is generated from the femtos…
View article: Bunch Length Measurement Employing Cherenkov Radiation from a Thin Silica Aerogel
Bunch Length Measurement Employing Cherenkov Radiation from a Thin Silica Aerogel Open
The temporal profile measurement for ultra-short electron bunches is one of the key issues for accelerator-based coherent light sources. A bunch length measurement system using Cherenkov radiation (CR) is under development at the Research …
View article: Study on Generation of Variable Polarized Coherent THz Radiation Using a Crossed Undulator
Study on Generation of Variable Polarized Coherent THz Radiation Using a Crossed Undulator Open
A variable polarized THz radiation source using a crossed undulator system has been developed at Tohoku University. In this scheme, two coherent undulator radiations from an extremely short electron bunch are used to control the polarizati…
View article: Demonstration of Coherent Radiation Generation up to 3 THz from Femtosecond Electron Pulses
Demonstration of Coherent Radiation Generation up to 3 THz from Femtosecond Electron Pulses Open
Coherent transition radiation in Terahertz (THz) frequency region generated by femtosecond electron pulse was demonstrated at a test accelerator in Research Center for Electron Photon Science (ELPH), Tohoku University. In the test accelera…
View article: Study of Cherenkov Radiation from Thin Silica Aerogel
Study of Cherenkov Radiation from Thin Silica Aerogel Open
A beam diagnostics system employing Cherenkov radiation from a thin silica aerogel has been studied at Research Center for Electron Photon Science (ELPH), Tohoku University. We are developing a Linear Focal Cherenkov ring Camera (LFC-Camer…
View article: Generation of Coherent Undulator Radiation at ELPH, Tohoku University
Generation of Coherent Undulator Radiation at ELPH, Tohoku University Open
A test accelerator as a coherent terahertz source (t-ACTS) has been under development at Tohoku University, in which an intense coherent terahertz (THz) radiation generated by an extremely short electron bunch. Velocity bunching scheme in …
View article: Proof-of-Principle Experiment of Velocity Bunching for Ultra-Short Electron Pulse Production
Proof-of-Principle Experiment of Velocity Bunching for Ultra-Short Electron Pulse Production Open
An accelerator test facility, t-ACTS, established at Research Center for Electron Photon Science, Tohoku University, equips an injector consisted with a thermionic RF gun together with an energy filter and a 3 m traveling wave accelerating…
View article: Development Status of Linear Focal Cherenkov Ring Camera
Development Status of Linear Focal Cherenkov Ring Camera Open
Linear focal Cherenkov ring camera (LFC-Camera) has been developed for single shot measurement of longitudinal phase space distribution of quasi-relativistic electron beam, where the electron's velocity still depends on its energy. The LFC…
View article: Status of the 1.3 GeV Booster Synchrotron for Generating High Energy Gamma Rays at Tohoku University
Status of the 1.3 GeV Booster Synchrotron for Generating High Energy Gamma Rays at Tohoku University Open
The reconstruction work of accelerator complex for the Great East Japan Earthquake in March 2011 had been conducted in Research Center of Electron Photon Science, Tohoku University. Since restoration of the user machine time in 2013, the a…
View article: Generation of Coherent Undulator Radiation using Extremely Short Electron Bunch at t-ACTS, Tohoku University
Generation of Coherent Undulator Radiation using Extremely Short Electron Bunch at t-ACTS, Tohoku University Open
An accelerator test facility, t-ACTS, was established at Research Center for Electron Photon Science, Tohoku University, in which an intense coherent terahertz (THz) radiation is generated from an extremely short electron bunch. Velocity b…
View article: Production of Ultra-short Electron Pulse and Observation of Coherent Transition Radiation at t-ACTS, Tohoku University
Production of Ultra-short Electron Pulse and Observation of Coherent Transition Radiation at t-ACTS, Tohoku University Open
A test-Accelerator as Coherent Terahertz Source (t-ACTS) project has been under development at Research Center for Electron Photon Science, Tohoku University. In order to generate a coherent radiation in terahertz (THz) region, it is neces…
View article: Profile Measurements of Bremsstrahlung Gamma-Rays from Tungsten Plates for Radioactive Isotope Production via Photonuclear Reaction using a 60 MeV Electron Linac
Profile Measurements of Bremsstrahlung Gamma-Rays from Tungsten Plates for Radioactive Isotope Production via Photonuclear Reaction using a 60 MeV Electron Linac Open
Radioactive isotopes have been produced via photo-nuclear reaction using a 60 MeV high-power electron linac for research fields of nuclear chemistry and radioac-tive analysis at Research Center for Electron Photon Science (ELPH), Tohoku Un…