Speaker
Dr
Luca Antonelli
(University of York)
Description
X-ray phase contrast imaging (XPCI) is an imaging technique based on the phase-shift of an X-ray photon induced by the refractive index. In particular, the phase-shift is related to the real part of X-ray phase contrast imaging (XPCI) is an imaging technique based on the phase_shift of an X-ray photon induced by the refractive index. In particular, the phase-shift is related to the real part of the
refractive index, while the imaginary part is related to the absorption. A coherent X-ray source such as a synchrotron or X-ray free electron laser are the best choice for XPCI, however, it is possible to use broadband incoherent X-ray sources by limiting the source size and careful positioning of the experiment and detector. The interaction of high power laser with matter produces X-rays according to the intensity, energy and pulse duration. These sources can be used for XPCI. In this work we present the characterization and the application of XPCI using a laser-produced bremsstrahlung source to a shock. The X-ray source was created by irradiating a 5 μm diameter tungsten wire with a Nd:Glass laser pulse 0.5 ps long and energy of 25 J in first harmonic. This produces a strong bremsstrahlung radiation. We applied this source to XPCI static objects and a laser-driven shock-wave in a plastic target. In both cases the XPCI clearly indicates the presence of density interfaces with 5 μm spatial resolution. This proof-of-principle experiment shows how this technique can be a powerful tool for the study of warm and hot dense matter on large scale high-energy-density facilities.therefractive index, while the imaginary part is related to the absorption. A coherent X-ray source such as a synchrotron or X-ray free electron laser are the best choice for XPCI, however, it is possible to use broadband incoherent X-ray sources by limiting the source size and careful positioning of the experiment and detector. The interaction of high power laser with matter produces X-rays according to the intensity, energy and pulse duration. These sources can be used for XPCI. In this work we present the characterization and the application of XPCI using a laser-produced bremsstrahlung source to a shock. The X-ray source was created by irradiating a 5 μm diameter tungsten wire with a Nd:Glass laser pulse 0.5 ps long and energy of 25 J in first harmonic. This produces a strong bremsstrahlung radiation. We applied this source to XPCI static objects and a laser-driven shock-wave in a plastic target. In both cases the XPCI clearly indicates the presence of density interfaces
with 5 μm spatial resolution. This proof-of-principle experiment shows how this technique can be a powerful tool for the study of warm and hot dense matter on large scale high-energy-density facilities.
Primary authors
Mr
Francesco Barbato
(EMPA)
Dr
Luca Antonelli
(University of York)
Co-authors
Dr
Angelo Schiavi Schiavi
(SBAI Department, Sapienza University of Rome)
Dr
Bernhard Zielbauer
(GSI)
Dr
Christian Brabetz
(GSI)
Dimitri Batani
(INFN)
Mr
Donaldi Mancelli
(University of Bordeaux)
Mr
Ghassan Zeraouli
(CLPU, University of Salamanca)
Dr
Guillaume Boutoux
(CEA)
Prof.
Luca Volpe
(CLPU, University of Salamanca)
Prof.
Nigel Woolsey
(University of York)
Mr
Philip Bradford
(University of York)
Prof.
Stefano Atzeni
(Università di Roma "La Sapienza" and CNISM)
Mr
Trela Jocelain
(University of Bordeaux)
Dr
Vincent Bagnoud
(GSI)
