This UED apparatus is one of unique tools for observing the ultrafast (within a few ps) change of atomic/molecular structure. It is operated by a relativistic (MeV) electron bunch with a fs bunch duration and frequency-selectable pumping light sources from ultraviolet to terahertz wave.
Features and Advantages
MeV electron bunch generation and acceleration in RF-photocathode
Specially designed and developed electron beamlines for UED experiments satisfying both achromatic and isochronous conditions
Enable to measure the ultrafast structural dynamics of solid- and gaseous specimens
High-performance CCD camera measurement and analysis
Specification
Specification is Beam parameter, Measured value, Unit
Beam parameter
Measured value
Unit
UV laser spot size@cathode (FWHM)
0.2~0.5
mm
UV pulse duration@cathode (FWHM)
130
fs
Bunch charge of electrons
0.4~2.5
pC
Beam kinetic energy
2.8~3.2
MeV
Energy spread (rms)
~0.23
%
Normalized emittance
0.23~0.34
mm-mrad
Bunch length of electrons (rms)
~30
fs
Arrival timing jitter between electron & laser pulses
<20
fs
Instrumental temporal resolution
~44
fs
Utilization area
Observation and investigation of physical mechanisms in nature such as, synthesis, decomposition, and melting etc.
Investigation on cooper-pair formation of high-temperature superconductors
Observation and manipulation of charge density wave of strongly-correlated materials
Investigation on operation mechanism and optimization of perovskite solar cell
Representative performance
Demonstration of the world-fastest camera for observing atomic/molecular structure
