Single-shot grating-based phase-contrast imaging of a micrometer sample at a laser-driven x-ray backlighter source

Akstaller, Bernhard; Schreiner, Stephan; Hofmann, Florian; Meyer, Pascal; Neumayer, P.; Schuster, Max; Wolf, Andreas; Zielbauer, B.; Ludwig, Veronika; Michel, Thilo; Anton, Gisela; Funk, Stefan

doi:10.1088/1748-0221/16/06/p06021

Cited by 6 publications

(15 citation statements)

References 42 publications

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“…The dominating X-ray energy at PHELIX was determined in [ 40 ] using propagation-based phase-contrast imaging. In [ 26 ], a grating-based phase-contrast imaging setup, optimized for the dominating energy range, was introduced, evaluated, and the dominating energy verified. Accordingly, we expect an effective energy of 11 keV with a fluctuation of approximately 1 keV.…”

Section: Methodsmentioning

confidence: 99%

“…In addition to the spectrum, the source position is fluctuating as well. The magnitude of this lateral fluctuation is given in [ 26 ] with 20 μm.…”

Section: Methodsmentioning

confidence: 99%

“…A schematic of the Moiré imaging setup is shown in Figure 3 . A similar setup was also used in [ 26 ], to image a 25 μm-thick polyimide foil with a magnification of approximately 47. The used gratings were manufactured by the Institute of Micro Structure Technology (IMT) at the Karlsruhe Institute of Technology (KIT) using the deep X-ray LIGA process [ 43 , 44 ].…”

Section: Methodsmentioning

confidence: 99%

“…At the PHELIX facility, the propagation-based phase-contrast imaging of laser-induced shock waves [ 23 , 24 ] was conducted. As grating-based phase-contrast imaging offers advantages compared to propagation-based techniques under certain conditions [ 25 ], such as, e.g., higher sensitivity to changes in the phase, test measurements at the PHELIX facility using gratings were performed and presented in [ 26 ]. There, static samples, imaged at high magnification using grating-based phase-contrast imaging, were evaluated.…”

Section: Introductionmentioning

confidence: 99%

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Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

et al. 2021

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X-ray backlighters allow the capture of sharp images of fast dynamic processes due to extremely short exposure times. Moiré imaging enables simultaneously measuring the absorption and differential phase-contrast (DPC) of these processes. Acquiring images with one single shot limits the X-ray photon flux, which can result in noisy images. Increasing the photon statistics by repeating the experiment to gain the same image is not possible if the investigated processes are dynamic and chaotic. Furthermore, to reconstruct the DPC and transmission image, an additional measurement captured in absence of the object is required. For these reference measurements, shot-to-shot fluctuations in X-ray spectra and a source position complicate the averaging of several reference images for noise reduction. Here, two approaches of processing multiple reference imagesin combination with one single object image are evaluated regarding the image quality. We found that with only five reference images, the contrast-to-noise ratio can be improved by approximately 13% in the DPC image. This promises improvements for short-exposure single-shot acquisitions of rapid processes, such as laser-produced plasma shock-waves in high-energy density experiments at backlighter X-ray sources such as the PHELIX high-power laser facility.

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Section: Methodsmentioning

confidence: 99%

“…In addition to the spectrum, the source position is fluctuating as well. The magnitude of this lateral fluctuation is given in [ 26 ] with 20 μm.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

et al. 2021

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“…Further details of the facility are available at the website of the Helmholtzzentrum für Schwerionen-forschung GmbH (GSI) [15,16]. The experiments described in this publication took place in February 2020 during the course of an experiment for the phase-contrast imaging of a micrometer sample using the laser-driven x-ray backlighter source [17,18]. For such experiments, the determination of the particle spectra emitted by the laser plasma has a high relevance [19].…”

Section: The Phexlix Facilitymentioning

confidence: 99%

Radiation measurements and simulations at the PHELIX laser facility, GSI

Behrens¹,

Hufschmidt²,

Röth³

et al. 2022

J. Inst.

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The absolute spectral electron and photon emission from a Tungsten target irradiated by the Petawatt High-Energy Laser for Heavy Ion EXperiments (PHELIX) facility was measured inside the PHELIX target chamber. For this, a thermo-lumi-nescence detector (TLD)-based few-channel spectrometer (FCS) was used in combination with a Bayesian data analysis. The results of the FCS measurement served as input for a Monte-Carlo particle transport simulation to determine the spectra and dose out of the PHELIX target chamber. Two different simulation methods proved to be consistent and, therefore, reliable. The simulation results were compared to the dose measured with a dosemeter that consists of three Dosepix detectors in combination with a neural network analysis. The two dose results show a satisfactory agreement.

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Electromagnetic pulse protective shielding for digital x-ray detectors

Schreiner,

Rauch,

Akstaller

et al. 2023

Review of Scientific Instruments

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Laser-driven x-ray backlighting can be used to image fast dynamic processes like the propagation of laser-driven shock waves in matter. We demonstrate and evaluate the feasibility of operating the JUNGFRAU detector designed by PSI, a direct detecting x-ray detector, in environments with extreme electromagnetic pulses. The electromagnetic pulse-protective housing is specifically designed for this detector and optimized for pump-probe experiments at the Petawatt High-Energy Laser for Heavy Ion EXperiments (PHELIX) facility at the GSI Helmholtzzentrum für Schwerionenforschung GmbH. The beryllium x-ray entrance window of the protective housing has a high x-ray transmission of 94% at 8 keV. Measurements have shown that the housing simultaneously provides a relative damping of the electromagnetic field on average higher than 1000 in the frequency range of 100 MHz to 5 GHz. The results demonstrate the feasibility of operating digital detectors in experiments where strong electromagnetic pulses are present.

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Single-shot grating-based phase-contrast imaging of a micrometer sample at a laser-driven x-ray backlighter source

Cited by 6 publications

References 42 publications

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

Radiation measurements and simulations at the PHELIX laser facility, GSI

Electromagnetic pulse protective shielding for digital x-ray detectors

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