Time-resolved soft x-ray absorption setup using multi-bunch operation modes at synchrotrons

Stebel, L.; Malvestuto, M.; Capogrosso, V.; Sigalotti, P.; Ressel, B.; Bondino, F.; Magnano, E.; Cautero, G.; Parmigiani, F.

doi:doi:10.1063/1.3669787

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Pulsed laser noise analysis and pump-probe signal detection with a data acquisition card

A photodiode and data acquisition card whose sampling clock is synchronized to the repetition rate of a laser are used to measure the energy of each laser pulse. Simple analysis of the data yields the noise spectrum from very low frequencies up to half the repetition rate and quantifies the pulse energy distribution. When two photodiodes for balanced detection are used in combination with an optical modulator, the technique is capable of detecting very weak pump-probe signals (ΔI/I0 ∼ 10−5 at 1 ...

Long-term frequency stabilization system for external cavity diode laser based on mode boundary detection

We have realized a long-term frequency stabilization system for external cavity diode laser (ECDL) based on mode boundary detection method. In this system, the saturated absorption spectroscopy was used. The current and the grating of the ECDL were controlled by a computer-based feedback control system. By checking if there are mode boundaries in the spectrum, the control system determined how to adjust current to avoid mode hopping. This procedure was executed periodically to ensure the long-te...

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 L₃ 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.

Article Outline

INTRODUCTION
EXPERIMENTAL SETUP
THE DETECTION AND ACQUISITION SYSTEMS
EXPERIMENTAL RESULTS
CONCLUSIONS AND FUTURE OUTLOOK

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KEYWORDS and PACS

Keywords

particle beam bunching, photon counting, synchrotron radiation, synchrotrons, X-ray absorption, X-ray spectroscopy

PACS

29.27.Eg

Beam handling; beam transport
29.20.dk

Synchrotrons
29.30.Kv

X- and γ-ray spectroscopy
07.85.Nc

X-ray and γ-ray spectrometers

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3669787

PUBLICATION DATA

ISSN

0034-6748 (print)

1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

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