Shanghai Advanced Research Institute realizes accurate measurement of X-ray pulse width
Sucker Rod Pump,Subsurface Sucker Rod Pump,Sucker Rod Pump Rwac,Sucker Rod Pump Downhole Puyang Zhongshi Group Co.,Ltd , https://www.puyangzhongshi.com
[ Instrument Network Instrument R & D ] X-ray is a particle flow caused by the transition of electrons in atoms between two energy levels with very different energies. It is electromagnetic radiation with a wavelength between ultraviolet and gamma rays. Its wavelength is very short between about 0.01 and 100 angstroms. Discovered by German physicist WK Roentgen in 1895, it is also called Roentgen ray.
It is reported that the research group of the researcher Li Bin of the Shanghai Institutes of Advanced Technology of the Chinese Academy of Sciences uses single-cycle terahertz field modulation to measure and restore ultrafast X-ray pulses, and proposed the full momentum of the ultrafast X-ray pulse-excited gas photoelectron wave packet modulated by the terahertz field The model can accurately measure the time-domain information of XFEL radiation pulses.
X-ray free electron laser (XFEL) is an ultra-fast X-ray light source with short radiation pulses (femtoseconds to hundreds of femtoseconds), high photon flux, good spatiotemporal coherence, and tunable wavelengths. The high-power femtosecond pulses in the extreme ultraviolet to X-ray bands have the characteristics of short radiation wavelengths and short radiation pulses, making them ideal light sources for time-resolved experiments.
Accurate measurement of XFEL radiation pulse width and time domain information is an important prerequisite for cutting-edge research on XFEL light sources, and an important basis for obtaining and analyzing the most realistic experimental data. The fringe camera technology can measure the radiation pulse width. However, the world's most advanced commercial fringe camera can only achieve time resolution of a few hundred femtoseconds. It cannot accurately measure XFEL radiation pulses with pulse widths of only a few femtoseconds to tens of femtoseconds.
In addition, the ultra-fast X-ray pulse recovery method can accurately measure XFEL pulse widths from several femtoseconds to hundreds of femtoseconds. Next, the research group will develop advanced XFEL radiation pulse online diagnostic technology equipment, provide technical parameters for machine debugging and optimization, and provide single-shot XFEL radiation pulse information for the majority of scientific experiment users.
When the zero center delay of the pulse center relative to the terahertz vector potential is zero, the result of the model restoration is the most accurate. The larger the zero center delay of the pulse center relative to the terahertz vector potential center, the larger the restored pulse width error. In addition, the shorter the XFEL's own pulse width, the more significant the effect of deviating from the terahertz vector zero.