17-19 October 2018
Laboratori Nazionali di Frascati INFN
Europe/Rome timezone

Characterization of sub-ps hard X-ray pulses for pump-probe experiments

19 Oct 2018, 11:30
30m
Aula Salvini (Laboratori Nazionali di Frascati INFN)

Aula Salvini

Laboratori Nazionali di Frascati INFN

Via E. Fermi 40 00044 Frascati (RM)

Speaker

ALESSANDRA CIAVARDINI (Ceric-Eric, Elettra Synchrotron)

Description

A.Ciavardini1*, C. Laulhé1,2, P. Fertey1, E. Elkaïm1, F. Berenguer1, Ph. Hollander1, P. Prigent1, M.-A. Tordeux1, M. Labat1 and S. Ravy1,3 1Synchrotron SOLEIL, 91192 GIF-sur-YVETTE CEDEX, France 2Université Paris-Saclay (PSud), F-91405 Orsay Cedex, France 3Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France *Present address:CERIC-ERIC, ELETTRA Synchrotron, 34149 Basovizza, Trieste ITALY Out-of-equilibrium states are obtained by irradiation with ultra-short laser pulses in the optical range, which induces electronic transitions on a timescale at which the lattice is considered to be frozen. Such phenomena are studied experimentally in the so-called ‘pump-probe’ scheme, in which the sample is excited (pumped) by a fs optical laser pulse and probed by a pulse of an eventually different wavelength such as X-rays. Currently ultra-short hard X-rays pulses are produced by X-FELs (Free Electron Laser), table-top X-ray plasma sources, and femto-slicing sources at synchrotrons. The femto-slicing scheme was proposed [1] and experimentally demonstrated for the first time at the Advanced Light Source (ALS) in Berkeley [2]. It is based on the interaction of a femtosecond laser with an electron bunch travelling through the magnetic field produced by an insertion device (usually a wiggler). This process is used to produce sub-picosecond hard X-ray tunable photons in synchrotrons. Such a femto-slicing source has recently been implemented at SOLEIL [3] synchrotron providing an average photon flux of 10e6 ph/s at 7 keV in a 0.8% bandwidth, with a repetition rate of 1 kHz. The commisioning of the source will be discussed. It was carried on the CRISTAL hard X-ray beamline, already used for time-resolved diffraction experiments [4], by using a Si(113) double crystal monochromator and a single photon-counting hybrid-pixel XPAD3.2 detector [5]. [1] A. A. Zholents and M. S. Zolotorev, Phys. Rev. Lett. 76,912 (1996) [2] R. W. Schoenlein et al., Applied Physics (New York) 71, 1 (2000). [3] M. Labat et al., J.Synchrotron Rad. 25, 385–398 (2018). [4] C. Laulhé et al., European Physical Journal 222(5), pp 1277-1285, (2013); C. Laulhé et al., Acta Physica Polonica A 121(2), pp. 332-335 (2012) [5] K Medjoubi et al., Journal of Instrumentation 6(1),C01080, (2011)

Primary author

ALESSANDRA CIAVARDINI (Ceric-Eric, Elettra Synchrotron)

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