scholarly journals A Compact Ultrafast Electron Diffractometer with Relativistic Femtosecond Electron Pulses

2020 ◽  
Vol 4 (1) ◽  
pp. 4 ◽  
Author(s):  
Jinfeng Yang ◽  
Kazuki Gen ◽  
Nobuyasu Naruse ◽  
Shouichi Sakakihara ◽  
Yoichi Yoshida
Keyword(s):  
Electron Diffraction ◽  
Amorphous Materials ◽  
Crystalline Silicon ◽  
Electron Gun ◽  
Diffraction Measurement ◽  
Single Shot ◽  
Time Resolved ◽  
Single Crystalline ◽  
Electron Lens ◽  
Electron Pulses

We have developed a compact relativistic femtosecond electron diffractometer with a radio-frequency photocathode electron gun and an electron lens system. The electron gun generated 2.5-MeV-energy electron pulses with a duration of 55 ± 5 fs containing 6.3 × 104 electrons per pulse. Using these pulses, we successfully detected high-contrast electron diffraction images of single crystalline, polycrystalline, and amorphous materials. An excellent spatial resolution of diffraction images was obtained as 0.027 ± 0.001 Å−1. In the time-resolved electron diffraction measurement, a laser-excited ultrafast electronically driven phase transition in single-crystalline silicon was observed with a temporal resolution of 100 fs. The results demonstrate the advantages of the compact relativistic femtosecond electron diffractometer, including access to high-order Bragg reflections, single shot imaging with the relativistic femtosecond electron pulse, and the feasibility of time-resolved electron diffraction to study ultrafast structural dynamics.

scholarly journals Optical fiber-driven low-energy electron gun for time-resolved streak diffraction

2019 ◽  
Vol 205 ◽  
pp. 08016
Author(s):  
Chiwon Lee ◽  
H. Kassier Gunther ◽  
R. J. Dwayne Miller
Keyword(s):  
Electron Diffraction ◽  
Optical Fiber ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Gun ◽  
Single Shot ◽  
Optical Fibres ◽  
Time Resolved ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron

The wave guiding feature of the optical fibre optical fibres is specifically exploited to construct a novel type of electron gun to realize single-shot low-energy electron diffraction experiments with the sub-picosecond resolution for studying irreversible samples.

Single-Shot Time-Resolved X-Ray Scattering Measurements of Polycrystalline and Amorphous Materials Under Shock Wave Loading

PRICM ◽  
2013 ◽  
pp. 3489-3496
Author(s):  
Kouhei Ichiyanagi ◽  
Kawai Nobuaki ◽  
Shunsuke Nozawa ◽  
Tokushi Sato ◽  
Jianbo Hu ◽  
...  
Keyword(s):  
Shock Wave ◽  
Amorphous Materials ◽  
Single Shot ◽  
Shock Wave Loading ◽  
Wave Loading ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Measurements ◽  
Ray Scattering

Time-resolved x-ray diffraction study of laser-induced shock and acoustic waves in single crystalline silicon

2009 ◽  
Vol 106 (4) ◽  
pp. 044914 ◽  
Author(s):  
K.-D. Liss ◽  
T. d’Almeida ◽  
M. Kaiser ◽  
R. Hock ◽  
A. Magerl ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Acoustic Waves ◽  
Crystalline Silicon ◽  
Single Crystalline Silicon ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
Single Crystalline ◽  
X Ray

Direct observation of intrinsic piezoelectricity of Pb(Zr,Ti)O3 by time-resolved x-ray diffraction measurement using single-crystalline films

2014 ◽  
Vol 105 (1) ◽  
pp. 012905 ◽  
Author(s):  
Takashi Fujisawa ◽  
Yoshitaka Ehara ◽  
Shintaro Yasui ◽  
Takafumi Kamo ◽  
Tomoaki Yamada ◽  
...  
Keyword(s):  
Direct Observation ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
Single Crystalline ◽  
X Ray ◽  
Crystalline Films

scholarly journals A compact electron gun for time-resolved electron diffraction

2015 ◽  
Vol 86 (1) ◽  
pp. 013109 ◽  
Author(s):  
Matthew S. Robinson ◽  
Paul D. Lane ◽  
Derek A. Wann
Keyword(s):  
Electron Diffraction ◽  
Electron Gun ◽  
Time Resolved

scholarly journals Femtosecond gas phase electron diffraction with MeV electrons

2016 ◽  
Vol 194 ◽  
pp. 563-581 ◽  
Author(s):  
Jie Yang ◽  
Markus Guehr ◽  
Theodore Vecchione ◽  
Matthew S. Robinson ◽  
Renkai Li ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Gas Phase ◽  
Spatial Resolution ◽  
Temporal Resolution ◽  
Timing Jitter ◽  
Electron Gun ◽  
Relativistic Electrons ◽  
New Device ◽  
Electron Pulses ◽  
Velocity Mismatch

We present results on ultrafast gas electron diffraction (UGED) experiments with femtosecond resolution using the MeV electron gun at SLAC National Accelerator Laboratory. UGED is a promising method to investigate molecular dynamics in the gas phase because electron pulses can probe the structure with a high spatial resolution. Until recently, however, it was not possible for UGED to reach the relevant timescale for the motion of the nuclei during a molecular reaction. Using MeV electron pulses has allowed us to overcome the main challenges in reaching femtosecond resolution, namely delivering short electron pulses on a gas target, overcoming the effect of velocity mismatch between pump laser pulses and the probe electron pulses, and maintaining a low timing jitter. At electron kinetic energies above 3 MeV, the velocity mismatch between laser and electron pulses becomes negligible. The relativistic electrons are also less susceptible to temporal broadening due to the Coulomb force. One of the challenges of diffraction with relativistic electrons is that the small de Broglie wavelength results in very small diffraction angles. In this paper we describe the new setup and its characterization, including capturing static diffraction patterns of molecules in the gas phase, finding time-zero with sub-picosecond accuracy and first time-resolved diffraction experiments. The new device can achieve a temporal resolution of 100 fs root-mean-square, and sub-angstrom spatial resolution. The collimation of the beam is sufficient to measure the diffraction pattern, and the transverse coherence is on the order of 2 nm. Currently, the temporal resolution is limited both by the pulse duration of the electron pulse on target and by the timing jitter, while the spatial resolution is limited by the average electron beam current and the signal-to-noise ratio of the detection system. We also discuss plans for improving both the temporal resolution and the spatial resolution.

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