Characterization of high spatial resolution lithium fluoride X-ray detectors

Mabey, P.; Albertazzi, B.; Michel, Th.; Rigon, G.; Makarov, Sergey; Ozaki, Norimasa; Matsuoka, T.; Pikuz, S. A.; Pikuz, T. A.; Kœnig, M.

doi:10.1063/1.5092265

Cited by 11 publications

(6 citation statements)

References 38 publications

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“…The unstable interface between the pusher and foam was examined using a short-pulse (<10 fs 35 ), nearly mono-chromatic (7 keV), collimated XFEL beam combined with a LiF crystal, used as a detector. The resulting x-ray radiographs 36 present cuttingedge high-resolution (see Fig. S3 in the Supplementary Information).…”

Section: Resultsmentioning

confidence: 99%

Micron-scale phenomena observed in a turbulent laser-produced plasma

et al. 2021

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Turbulence is ubiquitous in the universe and in fluid dynamics. It influences a wide range of high energy density systems, from inertial confinement fusion to astrophysical-object evolution. Understanding this phenomenon is crucial, however, due to limitations in experimental and numerical methods in plasma systems, a complete description of the turbulent spectrum is still lacking. Here, we present the measurement of a turbulent spectrum down to micron scale in a laser-plasma experiment. We use an experimental platform, which couples a high power optical laser, an x-ray free-electron laser and a lithium fluoride crystal, to study the dynamics of a plasma flow with micrometric resolution (~1μm) over a large field of view (>1 mm2). After the evolution of a Rayleigh–Taylor unstable system, we obtain spectra, which are overall consistent with existing turbulent theory, but present unexpected features. This work paves the way towards a better understanding of numerous systems, as it allows the direct comparison of experimental results, theory and numerical simulations.

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Section: Resultsmentioning

confidence: 99%

Micron-scale phenomena observed in a turbulent laser-produced plasma

et al. 2021

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“…A barrier to the uptake of these techniques is due to the limited characteristics of the employed detectors in terms of spatial resolution, dynamic range, field of view and non-destructive readout capabilities [3]. In the last decades, lithium fluoride (LiF) crystals and thin films have been successfully investigated as X-ray imaging detectors [4][5][6][7][8] based on optical reading of visible photoluminescence (PL) emitted by stable radiation-induced F 2 and F + 3 colour centres (CCs) [9]. These aggregate CCs electrons bound to two and three close anionic vacancies, respectively) possess almost overlapped absorption bands peaked at about 450 nm (blue spectral region); under optical pumping with blue light, they simultaneously emit broad PL bands peaked at 678 and 541 nm (red and green spectral regions), respectively, which can be read in non-destructive way by using fluorescence microscopy.…”

Section: Introductionmentioning

confidence: 99%

Optical characterization of lithium fluoride thin-film imaging detectors for monochromatic hard X-rays

et al. 2023

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Lithium fluoride (LiF) crystals and thin films have been successfully investigated as X-ray imaging detectors based on optical reading of visible photoluminescence emitted by stable radiation-induced F2 and F3 + colour centres. In this work, the visible photoluminescence response of optically-transparent LiF film detectors of three different thicknesses, grown by thermal evaporation on Si(100) substrates and irradiated with monochromatic 7 keV X-rays at several doses in the range between 13 and 4.5× 103 Gy, was carefully investigated by fluorescence optical microscopy. For all the film thicknesses, the photoluminescence response linearly depends on the irradiation dose in the investigated dose range. The lowest detected dose, delivered to the thinnest LiF film, only 0.5 μm thick, is estimated 13 Gy. Edge-enhancement imaging experiments, conducted by irradiating LiF film detectors at the same energy placing an Au mesh in front of them at a distance of 15 mm, allowed estimating a spatial resolution of (0.38 ± 0.05) μm, which is comparable to the microscope one. This very high spatial resolution in LiF film radiation detectors based on colour centres photoluminescence is combined with the availability of a wide field of view on large areas.

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“…It is known that the PL response of the LiF crystal depends only on the amount of absorbed energy in the crystal and does not depend on the energy of incident photons. In our calculation we applied the PL response function defined in recent works (Mabey et al, 2019;Makarov et al, 2020). This function was determined in a wide enough range of absorbed energies to be applicable for our experimental conditions.…”

Section: Experimental Methodsmentioning

confidence: 99%

Direct LiF imaging diagnostics on refractive X-ray focusing at the EuXFEL High Energy Density instrument

Makarov¹,

Makita²,

Nakatsutsumi³

et al. 2023

J Synchrotron Radiat

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The application of fluorescent crystal media in wide-range X-ray detectors provides an opportunity to directly image the spatial distribution of ultra-intense X-ray beams including investigation of the focal spot of free-electron lasers. Here the capabilities of the micro- and nano-focusing X-ray refractive optics available at the High Energy Density instrument of the European XFEL are reported, as measured in situ by means of a LiF fluorescent detector placed into and around the beam caustic. The intensity distribution of the beam focused down to several hundred nanometers was imaged at 9 keV photon energy. A deviation from the parabolic surface in a stack of nanofocusing Be compound refractive lenses (CRLs) was found to affect the resulting intensity distribution within the beam. Comparison of experimental patterns in the far field with patterns calculated for different CRL lens imperfections allowed the overall inhomogeneity in the CRL stack to be estimated. The precise determination of the focal spot size and shape on a sub-micrometer level is essential for a number of high energy density studies requiring either a pin-size backlighting spot or extreme intensities for X-ray heating.

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Characterization of high spatial resolution lithium fluoride X-ray detectors

Cited by 11 publications

References 38 publications

Micron-scale phenomena observed in a turbulent laser-produced plasma

Micron-scale phenomena observed in a turbulent laser-produced plasma

Optical characterization of lithium fluoride thin-film imaging detectors for monochromatic hard X-rays

Direct LiF imaging diagnostics on refractive X-ray focusing at the EuXFEL High Energy Density instrument

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