A5017931596- Advanced X-ray Imaging Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- Laser-Matter Interactions and Applications
- Laser-Plasma Interactions and Diagnostics
- Solid State Laser Technologies
- Pulsars and Gravitational Waves Research
- Crystallography and Radiation Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Photonic and Optical Devices
- Geotechnical Engineering and Soil Mechanics
- Advanced Fiber Laser Technologies
- Glass properties and applications
- Particle physics theoretical and experimental studies
- High-pressure geophysics and materials
- Geotechnical Engineering and Underground Structures
- Advancements in PLL and VCO Technologies
- Gamma-ray bursts and supernovae
- Diamond and Carbon-based Materials Research
- Electron and X-Ray Spectroscopy Techniques
- Mass Spectrometry Techniques and Applications
- Advanced Surface Polishing Techniques
- Laser Material Processing Techniques
- Quantum Chromodynamics and Particle Interactions
- Autoimmune Bullous Skin Diseases
Linac Coherent Light Source
2016-2025
SLAC National Accelerator Laboratory
2016-2025
SPring-8
2008-2024
NEC (Japan)
1985-2024
Institute of Entomology
2021-2023
RIKEN
2012-2023
St. Marianna University School of Medicine
2021-2023
Niigata University
2008-2023
Tohoku University
1990-2022
Canon (Japan)
2000-2022
A beamline for the x-ray free electron laser (XFEL) of SPring-8 Angstrom Compact LAser (SACLA) provides hard pulses in range 4.5–19.5 keV. Its optical system an optics hutch delivers a pink beam below 15 keV with either two double-mirror systems or monochromatic double-crystal monochromator. These XFEL beams are used various types measurement at experimental stations, e.g. diffraction, coherent diffraction imaging, spectroscopy and pump-and-probe measurement. The stations consist hutches...
This paper presents a 60GHz direct-conversion transceiver using quadrature oscillators. The 65nm CMOS realizes the IEEE802.15.3c full-rate wireless communication for every 16QAM/8PSK/QPSK/BPSK mode. maximum data rates with an antenna built in package are 8Gb/s QPSK mode and 11 Gb/s 16QAM within BER of <;1CH, transmitter receiver consume 186mW 106mW, respectively.
We determined the pulse duration of x-ray free electron laser light at 10 keV using highly resolved single-shot spectra, combined with an simulation. Spectral profiles, which were measured a spectrometer composed ultraprecisely figured elliptical mirror and analyzer flat crystal silicon (555), changed markedly when we varied compression strength bunch. The analysis showed that durations reduced from 31 to 4.5 fs for strongest condition. method, is readily applicable evaluate shorter...
Abstract Ultrafast photoinduced electron transfer preceding energy equilibration still poses many experimental and conceptual challenges to the optimization of photoconversion since an atomic-scale description has so far been beyond reach. Here we combine femtosecond transient optical absorption spectroscopy with ultrafast X-ray emission diffuse scattering at SACLA facility track non-equilibrated electronic structural dynamics within a bimetallic donor–acceptor complex that contains...
We report clear experimental evidence for second harmonic generation at hard x-ray wavelengths. Using a 1.7 Å pumping beam generated by free electron laser, we observe in diamond. The is of order 10 times the background radiation, scales quadratically with pump pulse energy, and over narrow phase-matching condition. Of importance future experiments, our results indicate that it possible to nonlinear processes crystals intensities exceeding 1016 W/cm2.
Time-resolved femtosecond x-ray diffraction patterns from laser-excited molecular iodine are used to create a movie of intramolecular motion with temporal and spatial resolution 30 fs 0.3 Å. This high fidelity is due interference between the nonstationary excitation stationary initial charge distribution. The state as local oscillator for heterodyne amplification excited distribution retrieve real-space movies atomic on ångstrom scales. has not been employed image internal in molecules...
This paper presents a 60-GHz direct-conversion RF front-end and baseband transceiver including analog digital circuitry for PHY functions. The 65-nm CMOS consumes 319 223 mW in transmitting receiving mode, respectively. It is capable of more than 7-Gb/s 16QAM wireless communication every channel the standards, which can be extended up to 10 Gb/s. 40-nm analog, digital, I/O 196 427 modes, In baseband, 5-b 2304-MS/s ADC 12 mW, 6-b 3456-MS/s DAC 11 mW. integrating all functions, (1440, 1344)...
The 13th harmonic of a Ti:sapphire (Ti:S) laser in the plateau region was injected as seeding source to 250-MeV free-electron-laser (FEL) amplifier. When amplification conditions were fulfilled, strong enhancement radiation intensity by factor 650 observed. random and uncontrollable spikes, which appeared spectra Self-Amplified Spontaneous Emission (SASE) based FEL without source, found be suppressed drastically form narrow-band, single peak profile at 61.2 nm. properties seeded well...
Significance Understanding ultraintense light–matter interactions is an intriguing subject from viewpoints of basic science and practical applications. For the X-ray region, such research fields have opened up with emergence free-electron lasers (XFELs). By using X-ray–X-ray pump–probe scheme, we firstly measured atomic response to XFEL light femtosecond–ångstrom time–space resolutions. It was found that position freezing until 20 fs after irradiation, which supports feasibility damageless...
We report a method for achieving advanced photon diagnostics of x-ray free-electron lasers (XFELs) under quasi-noninvasive condition by using beam-splitting scheme. Here, we used transmission grating to generate multiple branches beams. One the two primary diffracted (+1st-order) is utilized spectral measurement in dispersive scheme, while other (-1st-order) dedicated arrival timing between XFEL and optical laser pulses. The transmitted beam (0th-order) guided an experimental station. To...
We propose a compact, high-power, and high-directivity surface-emitting terahertz (THz) source based on an array of active antennas with integrated patch resonant-tunneling diodes (RTDs). An configuration antennas, each antenna two RTDs coupled by microstrip lines, enables spatial power combining improves directivity through coherent oscillation. confirmed maximum radiation 11.8 mW in prototype 6 × at oscillation frequency 0.45 THz. Parasitic low frequencies was suppressed use bias...
An additional event near the upper kinematic limit for K+-->pi(+)nunu; has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, branching ratio is B(K+-->pi(+)nunu;)=(1.47(+1.30)(-0.89))x10(-10) based on three events in pion momentum region 211<P<229 MeV/c. At measured central value of ratio, had a signal-to-background 0.9.
This paper presents a 60 GHz direct-conversion front-end and baseband transceiver, including analog digital circuitry for the PHY functions. The 65 nm CMOS consumes 319 mW 223 in transmitting receiving mode, respectively, is capable of more than 7 Gb/s 16QAM wireless communication every channel standards. 40 incorporating LDPC 196 398 respectively. entire system, using 6dBi antenna built an organic package, can transmit 3.1Gb/s over 1.8 m QPSK 6.3 0.05 16QAM.
Abstract The interactions between electrons and lattice vibrations are fundamental to materials behaviour. In the case of group IV–VI, V related materials, these strong, exist near electronic structural phase transitions. prototypical example is PbTe whose incipient ferroelectric behaviour has been recently associated with large phonon anharmonicity thermoelectricity. Here we show that it primarily electron-phonon coupling involving electron states band edges leads instability in PbTe. Using...
We have developed a method of dispersive x-ray absorption spectroscopy with hard free electron laser (XFEL), generated by self-amplified spontaneous emission (SASE) mechanism. A transmission grating was utilized for splitting SASE-XFEL light, which has relatively large bandwidth (ΔE/E ∼ 5 × 10−3), into several branches. Two primary split beams were introduced spectrometer measuring signal and reference spectra simultaneously. After normalization, we obtained Zn K-edge spectrum photon-energy...
Abstract The dynamics of liquid water feature a variety time scales, ranging from extremely fast ballistic-like thermal motion, to slower molecular diffusion and hydrogen-bond rearrangements. Here, we utilize coherent X-ray pulses investigate the sub-100 fs equilibrium ambient conditions down supercooled temperatures. This novel approach utilizes inherent capability speckle visibility spectroscopy measure intermolecular with lengthscale selectivity, by measuring oxygen motion in momentum...
Abstract Despite more than a century of study, the fundamental mechanisms behind solid melting remain elusive at nanoscale. Ultrafast phenomena in materials irradiated by intense femtosecond laser pulses have revived interest unveiling puzzling processes transitions. However, direct experimental validation various microscopic models is limited due to difficulty imaging internal structures undergoing ultrafast and irreversible Here we overcome this challenge through time-resolved single-shot...