Time-resolved soft x-ray absorption setup using multi-bunch operation modes at synchrotrons.
Here, we report on a novel experimental apparatus for performing time-resolved soft x-ray absorption spectroscopy in the sub-ns time scale using non-hybrid multi-bunch mode synchrotron radiation. The present setup is based on a variable repetition rate Ti:sapphire laser (pump pulse) synchronized with the ~500 MHz x-ray synchrotron radiation bunches and on a detection system that discriminates and singles out the significant x-ray photon pulses by means of a custom made photon counting unit. The whole setup has been validated by measuring the time evolution of the L(3) absorption edge during the melting and the solidification of a Ge single crystal irradiated by an intense ultrafast laser pulse. These results pave the way for performing synchrotron time-resolved experiments in the sub-ns time domain with variable repetition rate exploiting the full flux of the synchrotron radiation.
Sincrotrone Trieste, S.S. 14 km 163.5, Area Science Park, 34149 Basovizza (Ts), Italy.
L
L
Stebel
M
M
Malvestuto
V
V
Capogrosso
P
P
Sigalotti
B
B
Ressel
F
F
Bondino
E
E
Magnano
G
G
Cautero
F
F
Parmigiani