Hard x-ray intensity autocorrelation using direct two-photon absorption

Osaka, Taito; Inoue, Ituro; Yamada, Jumpei; Inubushi, Yuichi; Matsumura, Shotaro; Sano, Yasuhisa; Tono, Kensuke; Yamauchi, Kazuto; Tamasaku, Kenji; Yabashi, Makina

doi:10.1103/physrevresearch.4.l012035

Cited by 10 publications

(4 citation statements)

References 55 publications

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“…The direct method to measure duration and longitudinal coherence is to develop and fabricate an X-ray auto-correlator such as the EUV-and XUV-region device developed at FLASH [128,129] and FERMI using the wave-front split and delay scan technique. Currently, an autocorrelation technique for the hard X-ray region is still in development at SCALA and LCLS [130,131], where single X-ray pulse splitting is performed by Laue crystal diffraction to keep the device compact. An X-ray auto-correlator is constructed similar to a visible light auto-correlator: the beam is split into two identical replicas through a split-delay unit (SDU), the mutual delay between the two replicas is generated via a scanning stage, and finally the two replicas are recombined to create a nonlinear signal, from which the photon pulse duration as well as the phase information can be retrieved and determined.…”

Section: X-ray Diagnosticsmentioning

confidence: 99%

The MING proposal at SHINE: megahertz cavity enhanced X-ray generation

et al. 2023

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The cavity-based X-ray free-electron laser (XFEL) has promise in producing fully coherent pulses with a bandwidth of a few meV and very stable intensity, whereas the currently existing self-amplified spontaneous emission (SASE) XFEL is capable of generating ultra-short pulses with chaotic spectra. In general, a cavity-based XFEL can provide a spectral brightness three orders of magnitude higher than that of the SASE mode, thereby opening a new door for cutting-edge scientific research. With the development of superconducting MHz repetition-rate XFEL facilities such as FLASH, European-XFEL, LCLS-II, and SHINE, practical cavity-based XFEL operations are becoming increasingly achievable. In this study, megahertz cavity enhanced X-ray generation (MING) is proposed based on China’s first hard XFEL facility - SHINE, which we refer to as MING@SHINE.

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Section: X-ray Diagnosticsmentioning

confidence: 99%

The MING proposal at SHINE: megahertz cavity enhanced X-ray generation

et al. 2023

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“…Recently, the pulse duration of an XFEL was measured directly [ 87 ] to approximately 10 fs. This experiment demonstrates that the nonlinear regime of optics may be accessed in the X-ray domain, that is, sufficiently high photon densities can be produced.…”

Section: X-ray Polarimetry and Vacuum Birefringencementioning

confidence: 99%

“…In Asia, the first FEL facility was the SPring-8 Ångström Compact Free-Electron Laser (SACLA) [ 101 ] in Japan, with a peak X-ray laser power of 1 GW and wavelength of 0.1 nm. It has matured to multi-beamline, soft and hard X-ray operation [ 102 , 103 ] and extreme intensities [ 87 ] . The Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) [ 76 ] produces wavelengths of 0.1 and 1 nm for hard and soft X-rays, respectively.…”

Section: X-ray Polarimetry and Vacuum Birefringencementioning

confidence: 99%

X-ray polarimetry and its application to strong-field quantum electrodynamics

Shen

et al. 2023

High Pow Laser Sci Eng

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Polarimetry is a highly sensitive method to quantify changes of the polarization state of light when passing through matter and is therefore widely applied in material science. The progress of synchrotron and X-ray free electron laser (XFEL) sources has led to significant developments of X-ray polarizers, opening perspectives for new applications of polarimetry to study source and beamline parameters as well as sample characteristics. X-ray polarimetry has shown to date a polarization purity of less than $1.4\times {10}^{-11}$ , enabling the detection of very small signals from ultrafast phenomena. A prominent application is the detection of vacuum birefringence. Vacuum birefringence is predicted in quantum electrodynamics and is expected to be probed by combining an XFEL with a petawatt-class optical laser. We review how source and optical elements affect X-ray polarimeters in general and which qualities are required for the detection of vacuum birefringence.

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“…Regardless, the development of high-precision novel X-ray optics, [2][3][4] as well as the revolution of X-ray sources are core to advancing Xray measurement methods. [5][6][7][8] Recently, X-ray optics also played a key role in further innovation of X-ray sources. A specific example is the generation of intense and monochromatic X-ray free-electron laser (XFEL) [9][10][11][12][13] pulses through the so-called self-seeding principle [14][15][16][17][18] where an X-ray seed pulse with a narrow bandwidth is amplified through interaction with a low-emittance electron bunch in a long undulator.…”

mentioning

confidence: 99%

High-pressure plasma etching up to 9 atm toward uniform processing inside narrow grooves of high-precision X-ray crystal optics

Matsumura,

Ogasahara,

Miyake

et al. 2024

Appl. Phys. Express

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We developed a new etching technique using plasma generated at high pressure up to 9 atm. Operating at 9-atm pressure with a 30-μm-diameter wire electrode, we demonstrate the generation of well-ordered plasma at a narrow gap of ~10 μm between the electrode and workpiece, and realize a high spatial resolution in processing of <40 μm during processing. This technique should allow for the processing of the high-precision X-ray crystal optical devices with compact and complex structures, such as a micro channel-cut crystal monochromator with an extremely narrow (sub-100 μm width) groove for realization of Fourier-transform-limited X-ray lasers with high intensity.

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Hard x-ray intensity autocorrelation using direct two-photon absorption

Cited by 10 publications

References 55 publications

The MING proposal at SHINE: megahertz cavity enhanced X-ray generation

The MING proposal at SHINE: megahertz cavity enhanced X-ray generation

X-ray polarimetry and its application to strong-field quantum electrodynamics

High-pressure plasma etching up to 9 atm toward uniform processing inside narrow grooves of high-precision X-ray crystal optics

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