Current status and future perspectives of accelerator-based x-ray light sources

Tanaka, Takashi

doi:10.1088/2040-8986/aa7bf7

Cited by 8 publications

(4 citation statements)

References 134 publications

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“…Today, high-brilliant beams of X-rays are generated by radiation from relativistic electrons by a scheme of Bremsstrahlung (breaking radiation) or Synchrotronstrahlung (synchrotron radiation) [4,5]. Facilities of synchrotron radiation exist all over the world today and are *Correspondence: imatsuda@issp.u-tokyo.ac.jp 1 The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan Full list of author information is available at the end of the article continuously developed [6], and experimentalists are able to use such X-rays with tunable photon energy. An X-ray has been conventionally classified by ranges of the high photon energy (hard X-ray, 2-10 keV) and the low photon energy (soft X-ray, 0.2-2 keV).…”

Section: Introductionmentioning

confidence: 99%

Fast and versatile polarization control of X-ray by segmented cross undulator at SPring-8

et al. 2021

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An X-ray is the well-known probe to examine structure of materials, including our own bodies. The X-ray beam, especially at the wavelength of nanometers, has also become significant to directly investigate electronic states of a sample. Such an X-ray is called a soft X-ray and polarization dependence of the light-matter interaction further unveils the microscopic properties, such as orbitals or spins of electrons. Generation of high brilliant beams of the polarized X-ray has linked to development of our experimental science, and it has been made by radiation from relativistic electrons at the synchrotron radiation facilities over the world. Recently, we constructed a new polarization-controlled X-ray source, the segmented cross undulator, at SPring-8, the largest synchrotron radiation facility in the world. The operation is based on interference of X-ray beams, which is sharply contrast to the conventional method of regulating electron trajectory by the mechanical control of magnets. The paradigm shift opened the measurement innovations and allowed us to design new experimental approaches to capture signals that have been hidden in materials. The present review describes the novel X-ray source with the principle of operation and the technical details of optimization. Examples of the frontier spectroscopies that use unique optical properties of the source are introduced, followed by the future prospects for next generation synchrotron radiation facilities.

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Section: Introductionmentioning

confidence: 99%

Fast and versatile polarization control of X-ray by segmented cross undulator at SPring-8

et al. 2021

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“…Over the years the undulator technology have been renewed and upgraded enabling the free electron laser ( FEL) [1][2][3][4][5] to be useful for different physics, chemistry, biology and engineering based applications. The bi-period, staggered array undulator, step tapered, Optical klystron undulators, Apple type and Delta undulators are examples of higher generation FEL schemes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of undulator and gyro-synchrotron radiation for application at tera-hertz

Mishra

Gehlot

Gupta

2023

J. Phys.: Conf. Ser.

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We analyze the undulator and gyro-synchrotron radiation of the devices by equating the number of periods of the helical trajectory of the gyrating motion to the number of undulator periods. The gyro radiation is characterized by cyclotron resonance maser interaction exhibits superior line width quality but higher sensitive to beam energy spread when operated at tera-hertz due to finite larmor radius effects.

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“…Free Electron Lasers (FELs) are powerful, tunable, and versatile radiation sources used in various scientific and industrial applications, spanning from microwaves to hard X-rays 1 . Several FEL facilities have been developed or built around the world with wavelength ranges covering the hard X-ray to THz spectrum 2 , 3 . FELs can operate as high-gain, single-pass amplifiers or low-gain oscillators.…”

Section: Introductionmentioning

confidence: 99%

Solving the spectral gap problem with a four-mirror bow-tie cavity in waveguide free-electron laser oscillators

Xia,

Xu,

Zhao

et al. 2023

Sci Rep

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The generation of intense coherent radiation pulses in the far-infrared and terahertz regimes is of considerable interest to the free-electron laser (FEL) radiation user community. At long wavelengths, the diffraction effect can be quite severe, therefore, an optical waveguide is required to confine the radiation field. However, it will also bring about some new phenomena, and the most noteworthy one is the spectral gap phenomenon: at some particular wavelengths, regardless of electron beam adjustments, the coupling efficiency and output power of waveguide FEL oscillators drop significantly. Such spectral gap has an adverse effect on experimental results since numerous experiments require continuous spectral scanning. In this paper, we propose to utilize a bow-tie cavity instead of conventional cavities to the waveguide FEL to solve the spectral gap problem. The simulation was carried out based on the parameters of FELiChEM, a newly built user facility in China. Numerical simulation code OPC combining with modified GENESIS is used to enable the modelling, for the first time, of a bow-tie cavity based FEL in the far-infrared wavelength regime. The simulation results indicate that this novel structure can effectively eliminate the spectral gaps and substantially enhance long-wavelength laser performance.

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Current status and future perspectives of accelerator-based x-ray light sources

Cited by 8 publications

References 134 publications

Fast and versatile polarization control of X-ray by segmented cross undulator at SPring-8

Fast and versatile polarization control of X-ray by segmented cross undulator at SPring-8

Analysis of undulator and gyro-synchrotron radiation for application at tera-hertz

Solving the spectral gap problem with a four-mirror bow-tie cavity in waveguide free-electron laser oscillators

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