Saga Light Source

Tosu, Japan

Saga Light Source

Tosu, Japan

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Takabayashi Y.,SAGA Light Source | Kaneyasu T.,SAGA Light Source | Iwasaki Y.,SAGA Light Source
Nuovo Cimento della Societa Italiana di Fisica C | Year: 2011

A beamline dedicated to the study of interactions of a relativistic electron beam with crystals has been designed and constructed at the SAGA Light Source (SAGA-LS). This beamline consists of a compact two-axis goniometer in a vacuum chamber and two screen monitors placed downstream of the goniometer. An electron beam is provided from the SAGA-LS injector linac. The beam parameters such as the beam emittance and the Twiss parameters have been measured using the "Q-scan method". Proposals for experiments on channeling radiation and parametric X-ray radiation are also discussed. © Società Italiana di Fisica.


Takabayashi Y.,SAGA Light Source
AIP Conference Proceedings | Year: 2010

We have proposed a method for observing parametric channeling radiation (PCR) and of applying it to the measurement of electron beam energy. The PCR process occurs if the energy of the channeling radiation coincides with the energy of the parametric X-ray radiation (PXR). The PCR process can be regarded as the diffraction of "virtual channeling radiation". We developed a scheme for beam energy measurement and designed an experimental setup. We also estimated the beam parameters, and calculated the angular distributions of PXR and PCR. These considerations indicate that the observation of PCR is promising. © 2010 American Institute of Physics.


Takabayashi Y.,SAGA Light Source | Shchagin A.V.,National Science Center Kharkov Institute of Physics and Technology
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2012

We have demonstrated experimentally the application of an imaging plate for registering the angular distribution of parametric X-ray radiation. The imaging plate was used as a two-dimensional position-sensitive X-ray detector. High-quality images of the fine structure in the angular distributions of the yield around the reflection of the parametric X-ray radiation produced in a silicon crystal by a 255-MeV electron beam from a linear accelerator have been observed in the Laue geometry. A fairly good agreement between results of measurements and calculations by the kinematic theory of parametric X-ray radiation is shown. Applications of the imaging plates for the observation of the angular distribution of X-rays produced by accelerated particles in a crystal are also discussed. © 2012 Elsevier B.V. All rights reserved.


Korotchenko K.B.,Tomsk Polytechnic University | Pivovarov Y.L.,Tomsk Polytechnic University | Takabayashi Y.,SAGA Light Source
JETP Letters | Year: 2012

The theory of X-ray radiation from relativistic channeled electrons at the Bragg angles-parametric X-ray radiation (PXR) during channeling (PXRC)-is developed while accounting for two quantum effects: the initial population of bound states of transverse motion and the transverse "form-factor" of channeled electrons. An experiment was conducted using a 255 MeV electron beam from a linac at the SAGA Light Source. We have identified a difference in the angular distributions of PXR and PXRC and obtained a fairly good agreement between the theoretical and experimental results. © 2012 Pleiades Publishing, Ltd.


Takabayashi Y.,SAGA Light Source
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2012

We propose two new approaches, referred to as the local and remote methods, for measuring electron beam sizes using parametric X-ray radiation. Using the local method, we have carried out a proof-of-principle experiment, and good agreement was obtained with the results of a standard method using a fluorescent screen. For the remote method, we have proposed a scheme to measure beam sizes using a Fresnel zone plate as an X-ray lens. These methods may prove useful for measuring the sizes of electron beams with small emittances or short bunch lengths in recent advanced accelerators. © 2012 Elsevier B.V. All rights reserved.


Shchagin A.V.,National Science Center Kharkov Institute of Physics and Technology | Takabayashi Y.,SAGA Light Source
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2013

The emission of parametric X-ray radiation (PXR) by a relativistic charged particle moving in a crystal rectilinearly is considered in terms of a conversion of virtual quanta accompanying the particle to real quanta. Some recent experimental data on the PXR properties are analyzed and the asymmetry of PXR reflection is considered. Simple analytical expressions for conversion factors are obtained from experimentally confirmed data. The properties of the conversion factors for the parametric X-ray radiation are discussed. © 2013 Published by Elsevier B.V.


Korotchenko K.B.,Tomsk Polytechnic University | Pivovarov Y.L.,Tomsk Polytechnic University | Takabayashi Y.,SAGA Light Source
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2013

The X-radiation from relativistic channeled electrons at the Bragg angles - Parametric X-Radiation at Channeling (PXRC) - is studied both experimentally and theoretically. The experiment was carried out using a 255 MeV electron beam from a Linac at newly constructed beam line for the study of interactions between a relativistic electron beam and crystals at the SAGA Light Source. The observed asymmetry of PXRC angular distribution at (220) planar channeling in a 20 μm Si is explained taking account of two quantum effects: initial populations and transverse form-factors of the quantum states of planar channeled electrons. Further perspectives for PXRC studies at SAGA-LS are analyzed. © 2013 Elsevier B.V. All rights reserved.


Takabayashi Y.,SAGA Light Source
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2013

Channeling phenomena have been studied extensively to date using mainly single crystals as a target. The purpose of the present study is to search for channeling effects in a polycrystal. Profiles of a 255 MeV electron beam transmitted through a 10 μm thick molybdenum polycrystalline foil were measured and channeling effects were successfully identified as enhancement of the beam sizes. The observed results can be explained in terms of the texture in the polycrystalline foil. Applications of channeling in a textured polycrystal to beam manipulation techniques and radiation sources are also discussed. © 2013 Elsevier B.V. All rights reserved.


Takabayashi Y.,SAGA Light Source | Sumitani K.,SAGA Light Source
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2013

We propose a new method for measuring electron beam profiles using parametric X-ray radiation. In this method, a pinhole is placed between the source of parametric X-ray radiation and a two-dimensional X-ray detector, and the beam profile can be reconstructed on the detector, i.e., based on the principle of a pinhole camera. The profiles are in good agreement with the results obtained using a standard method with optical transition radiation. This method may prove useful to measure profiles of electron beams with short bunch lengths in recent advanced linear accelerators. © 2013 Elsevier B.V.


Takabayashi Y.,SAGA Light Source | Pivovarov Y.L.,Tomsk Polytechnic University | Tukhfatullin T.A.,Tomsk Polytechnic University
Physics Letters, Section A: General, Atomic and Solid State Physics | Year: 2014

Experiments on 255-MeV electron scattering under (220) planar channeling conditions in a Si crystal were carried out at the linac of the SAGA Light Source. The spatial and angular distributions of electrons penetrating through a 20-μm thick Si crystal at different incident angles with respect to the (220) plane were measured, and features characteristic of the planar alignment were identified. The experimental results were compared with computer simulations, and showed a reasonable agreement. A comparison with doughnut scattering at axial channeling in the same crystal was also performed. It was confirmed that the planar alignment effect is weaker than the axial alignment effect. These studies are important for understanding the basic mechanism of electron scattering and radiation processes in a crystal. © 2014 Elsevier B.V.

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