Detection of X-ray polarization of Ar Z-pinch plasma

Shi, Jun; Xiao, Shali; Qian, Jiayu; Huang, Xianbin; Cai, Hongchun

doi:10.1016/j.nima.2010.09.039

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…An analogous detector setup was used to measure emission from Ar 16+ at the Torus Experiment of Technology Oriented Research (TEXTOR-94), where the w, x, y, and z lines were found to be unpolarized for two ohmic experimental conditions [17]. Later, the polarizations of the resonance and intercombination lines were inferred from the ratio of the two lines measured from an Ar Z-pinch plasma with two crystal analyzers employing position sensitive x-ray films to record the spectra [18].…”

Section: Introductionmentioning

confidence: 99%

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar¹⁶⁺

Dipti¹,

Buechele²,

Gall³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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High-resolution x-ray spectra were recorded at the National Institute of Standards and Technology electron beam ion trap (EBIT) using two Johann-type crystal spectrometers, with their dispersion planes oriented parallel and perpendicular to the beam direction. The linear polarizations of the 1s2 − 1s2l transitions in He-like argon ions were determined from the measured spectra at electron beam energies of 3.87 and 7.91 keV. The theoretical analysis was performed using detailed collisional-radiative modeling of the non-Maxwellian EBIT plasma with the NOMAD code modified to account for magnetic sublevel atomic kinetics. Effects influencing the polarizations of the observed 1s2 − 1s2l lines were investigated, including radiative cascades, the 1s2 1S0 − 1s2s 1S0 two-photon transition, and the charge exchange recombination of H-like argon ions. With these included, the measured polarizations of the resonance (1s2 1S0 − 1s2p 1P1), intercombination (1s2 1S0 − 1s2p 3P1), and forbidden lines (1s2 1S0 − 1s2s 3S1, 1s2 1S0 − 1s2p 3P2 ) were found to be in good agreement with the calculations.

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Section: Introductionmentioning

confidence: 99%

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar¹⁶⁺

Dipti¹,

Buechele²,

Gall³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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“…But, even when the plasma is distorted by kinklike magneto-hydrodynamic instabilities of the bulk plasma, in which the electrons are slow, thermal and isotropic, energetic electrons may remain directional and give the plasma an anisotropic component. [13][14][15] Scattering unpolarized x-rays over a 90 • angle leaves only a single polarization direction, perpendicular to the plane defined by the two paths. Therefore the traditional polarizing x-ray crystal spectrometer uses symmetric Bragg reflection from crystal planes parallel to the crystal surface, at a Bragg angle θ = 45 • .…”

Section: Introductionmentioning

confidence: 99%

X-ray polarization splitting by a single crystal evaluated with synchrotron x-rays

Pereira¹,

Presura

Wallace

et al. 2014

Review of Scientific Instruments

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In hexagonal crystals such as quartz, an asymmetric Bragg reflection from two equivalent internal crystal planes can separate unpolarized x-rays into two linearly polarized components. The perfectly polarized and tunable x-rays from a synchrotron are ideal to evaluate polarization spitting in detail. One unanticipated feature is that additional reflections from the crystal affect the diffraction intensity of the two polarized components, an effect that is unlikely to matter in polarization spectroscopy of radiating plasmas for which the crystal is intended.

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“…The X‐ray emission spectra from plasmas have often been measured using bent crystal spectrometers (Sanchez del Rio et al, ; Sinars et al, ; Anderson et al, ). The design of the bent crystal spectrometers provides higher collection efficiency with better resolving power than traditional flat crystal instruments do (Robbins et al, ; Shi et al, ).…”

Section: Introductionmentioning

confidence: 99%

Study of X‐Ray Imaging with Toroidally Bent Crystal

Shi

Xiao

Liu

et al. 2012

Int J Imaging Syst Tech

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We developed a focusing imager with a toroidally bent crystal imager. The imager can be used in X-ray imaging of laser fusion experiments. This article discusses the focusing properties of toroidally bent crystal in Bragg geometry. Simulations of spatial resolution for toroidally bent crystals with different conditions including source size and detector position were done using the ray-tracing method. The applicable conditions for optimized two-dimensional (2D) imaging of X-ray source are proposed. Toroidally bent crystal of mica with curvature radius 290 mm in the meridional plane and 190 mm in the sagittal plane is used as imaging element in the experiments. The high-quality visible 2D X-ray image was obtained with the imaging plate due to the high collection efficiency of the bent crystal imaging system. It is demonstrated that the toroidally bent mica crystal could be used in X-ray imaging. By analyzing the image information of the sagittal direction, we find out that the toroidal crystal imager has spatial resolution about 34 m.

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Detection of X-ray polarization of Ar Z-pinch plasma

Cited by 6 publications

References 6 publications

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar¹⁶⁺

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar¹⁶⁺

X-ray polarization splitting by a single crystal evaluated with synchrotron x-rays

Study of X‐Ray Imaging with Toroidally Bent Crystal

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Detection of X-ray polarization of Ar Z-pinch plasma

Cited by 6 publications

References 6 publications

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar16+

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar16+

X-ray polarization splitting by a single crystal evaluated with synchrotron x-rays

Study of X‐Ray Imaging with Toroidally Bent Crystal

Contact Info

Product

Resources

About

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar¹⁶⁺

Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in He-like Ar¹⁶⁺