Spatially resolved X-ray spectroscopy using a flat HOPG crystal

Yuan, Xiaofeng; Carroll, D. C.; Coury, M.; Gray, R. J.; Brenner, C. M.; Lin, Xiaona; Li, Y. T.; Quinn, M. N.; Tresca, O.; Zielbauer, B.; Neely, D.; McKenna, P.

doi:10.1016/j.nima.2010.12.147

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…The 'satellite' emission region extends for several millimeters and corresponds to X-ray emission from an extended region of the target surface. Simulations were performed using the ray tracing code XOP/SHADOW [14] to confirm this (simulation parameters are detailed in reference [13]). To simplify the modeling, the spatial profile of the X-ray source was designed as two points, orientated in the spectral dispersion plane.…”

Section: Resultsmentioning

confidence: 99%

“…The two slits, both 30 µm in width, are parallel to each other and perpendicular to the crystal surface, thus providing one-dimensional (1D) spatial measurement via pinhole imaging and 1D spectral dispersion via Bragg diffraction. The design and characterization have been reported in detail elsewhere [13]. The spectrometer was positioned at 45 • to the target normal at the rear side and in the plane of the laser irradiation.…”

Section: The Experimentsmentioning

confidence: 99%

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The influence of preformed plasma on the surface-guided lateral transport of energetic electrons in ultraintense short laser–foil interactions

Yuan¹,

Carroll²,

Zheng³

et al. 2014

Plasma Phys. Control. Fusion

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The lateral transport patterns of energetic electrons in thin foil targets irradiated by relativistically intense, picosecond laser pulses with different peak-topedestal intensity contrast ratios are reported. For 'low contrast' pulses, a large current of energetic electrons is found to be transported along the target front surface, due to the formation of strong quasi-static electric and magnetic fields. This is distinctly different from the case with 'high contrast' pulses, where energetic electrons are spatially confined. Although this lateral transport reduces laser energy coupling efficiency into ions and radiation production in the region of the laser focus, it can play an important role in directing energy transport in advanced fast ignition schemes involving hollow cone targets and also in heating the target (to generate states of warm dense matter) in regions far from the drive laser focus.

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Section: Resultsmentioning

confidence: 99%

Section: The Experimentsmentioning

confidence: 99%

The influence of preformed plasma on the surface-guided lateral transport of energetic electrons in ultraintense short laser–foil interactions

Yuan¹,

Carroll²,

Zheng³

et al. 2014

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…The experimental investigation of the measurement of electron temperature in the bulk plasma as a function of laser polarization inferred from the shifting of characteristic transition lines was achieved by employing one-dimensional imaged spectroscopy of Cu-Kα doublet via highly oriented pyrolytic graphite (HOPG) crystal spectrometer [29][30][31]. HOPG crystals consist of many small, perfectly aligned crystallites, making them highly efficient for x-ray diffraction over several keV ranges.…”

Section: Methodsmentioning

confidence: 99%

Probing bulk electron temperature via x-ray emission in a solid density plasma

Makur¹,

Ramakrishna²,

Krishnamurthy³

et al. 2023

Plasma Phys. Control. Fusion

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Bulk electron temperatures are calculated for thin Cu targets irradiated by the petawatt class Vulcan laser, from the Kα yield obtained using Highly Oriented Pyrolytic Graphite (HOPG) crystals. Cu-Kα emission studies have been used to probe the bulk electron temperature. A 30-80 eV core temperature extends homogeneously over distances up to ten times the laser focal spot size. Energy shifting has been observed due to different ionization states produced for different temperatures in plasma. Polarization dependencies of plasma temperatures are observed through the production of X-rays in different targets. 2D PIC simulations were performed to measure the polarization dependency of Bulk electron temperatures, which supports our experimental results. This paper could be of importance in understanding the different behavior of laser coupling in different polarizations and their role in x-ray production.

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Single-pulse (100 ps) extended x-ray absorption fine structure capability at the Dynamic Compression Sector

Das

Klug

Sinclair

et al. 2020

Review of Scientific Instruments

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Determining real-time changes in the local atomistic order is important for a mechanistic understanding of shock wave induced structural and chemical changes. However, the single event and short duration (nanosecond times) nature of shock experiments pose challenges in obtaining Extended X-ray Absorption Fine Structure (EXAFS) measurements—typically used for monitoring local order changes. Here, we report on a new single pulse (∼100 ps duration) transmission geometry EXAFS capability for use in laser shock-compression experiments at the Dynamic Compression Sector (DCS), Advanced Photon Source. We used a flat plate of highly oriented pyrolytic graphite (HOPG) as the spectrometer element to energy disperse x rays transmitted through the sample. It provided high efficiency with ∼15% of the x rays incident on the HOPG reaching an x-ray area detector with high quantum efficiency. This combination resulted in a good signal-to-noise ratio (∼103), an energy resolution of ∼10 eV at 10 keV, EXAFS spectra covering 100 s of eV, and a good pulse to pulse reproducibility of our single pulse measurements. Ambient EXAFS spectra for Cu and Au are compared to the reference spectra, validating our measurement system. Comparison of single pulse EXAFS results for ambient and laser shocked Ge(100) shows large changes in the local structure of the short lived state of shocked Ge. The current DCS EXAFS capability can be used to perform single pulse measurements in laser shocked materials from ∼9 keV to 13 keV. These EXAFS developments will be available to all users of the DCS.

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Spatially resolved X-ray spectroscopy using a flat HOPG crystal

Cited by 8 publications

References 12 publications

The influence of preformed plasma on the surface-guided lateral transport of energetic electrons in ultraintense short laser–foil interactions

The influence of preformed plasma on the surface-guided lateral transport of energetic electrons in ultraintense short laser–foil interactions

Probing bulk electron temperature via x-ray emission in a solid density plasma

Single-pulse (100 ps) extended x-ray absorption fine structure capability at the Dynamic Compression Sector

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