A high-resolution imaging x-ray crystal spectrometer for high energy density plasmas

Chen, Hui; Bitter, M.; Hill, K. W.; Kerr, S.; Magee, E. W.; Nagel, S. R.; Park, J.; Schneider, M. B.; Stone, G.; Williams, G. J.; Beiersdörfer, P.

doi:10.1063/1.4891053

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…The XICS concept has been demonstrated in two instruments on the TITAN laser facility at LLNL 19 and an instrument on the MEC (Matter under Extreme Conditions) at the LCLS (Linac Coherent Light Source) at SLAC (Stanford National Accelerator Center). The TITAN spectrometers measured high resolution He-α spectra of Ti and Ly-β spectra of Si.…”

Section: Demonstrations On Hedp Experimentsmentioning

confidence: 99%

Optics design of the divertor infrared television of KSTAR

Lee

et al. 2014

Review of Scientific Instruments

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The divertor Infrared television (IR TV) system for monitoring the temperature of a divertor and localized hot spots will be installed on the upper port of the N-port in the Korea Superconducting Tokamak Advanced Research (KSTAR). The cassette of KSTAR makes a periscope inevitable for the divertor IR TV. In this article, 4 design concepts for the periscope were examined, and the design based on Keplerian was shown to have better stabilities in alignment and the vibration. The final optics design based on an f-theta lens, Keplerian, and telecentric lens was derived.

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Section: Demonstrations On Hedp Experimentsmentioning

confidence: 99%

Optics design of the divertor infrared television of KSTAR

Lee

et al. 2014

Review of Scientific Instruments

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“…High-resolution X-ray imaging is very important in research fields such as laser-driven inertial-confinement fusion (ICF), high-energy-density physics, and laboratory astrophysics [1][2][3] . In ICF experiments, high-resolution X-ray monochromatic imaging of the hot spot in the late stages of a pellet implosion is a necessary diagnostic method for studying important physical issues, such as the shape of the hot spot, the temperature distribution, and fuel mixing [4,5] .…”

Section: Introductionmentioning

confidence: 99%

High-resolution Mo Kα X-ray monochromatic backlight imaging using a toroidal crystal

Si,

Shan,

et al. 2023

中国光学快报

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Curved crystal imaging is an important means of plasma diagnosis. Due to the short wavelengths of high-energy X rays and the fixed lattice constant of the spherical crystal, it is difficult to apply the spherical crystal in high-energy X-ray imaging. In this study, we have developed a high-energy, high-resolution X-ray imager based on a toroidal crystal that can effectively correct astigmatism. We prepared a Ge h5 1 1i toroidal crystal for backlighting Mo Kα1 characteristic lines (∼17.48 keV) and verified its high-resolution imaging ability in high-energy X-ray region, achieving a spatial resolution of 5-10 μm in a field of view larger than 1.0 mm.

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“…Spectra recorded at different vertical positions across the detector correspond to different lines of sight of the spectrometer. Therefore, crystal spectrometers provide line integrated measurements of plasma parameters [6][7][8][9][10][11] . The lines of sight are located in a bean shaped poloidal plasma cross section of W7-X.…”

Section: Introductionmentioning

confidence: 99%

Inference of temperature and density profiles via forward modeling of an x-ray imaging crystal spectrometer within the Minerva Bayesian analysis framework

Langenberg

Svensson

Marchuk

et al. 2019

Review of Scientific Instruments

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At the Wendelstein 7-X stellarator, the X-ray imaging crystal spectrometer provides line integrated measurements of ion and electron temperatures, plasma flows, as well as impurity densities from a spectroscopic analysis of tracer impurity radiation. In order to infer the actual profiles from line integrated data, a forward modeling approach has been developed within the Minerva Bayesian analysis framework. In this framework, the inversion is realized on the basis of a complete forward model of the diagnostic, including error propagation and utilizing Gaussian processes for generation and inference of arbitrary shaped plasma parameter profiles. For modeling of line integrated data as measured by the detector, the installation geometry of the spectrometer, imaging properties of the crystal, and Gaussian detection noise are considered. The inversion of line integrated data is achieved using the maximum posterior method for plasma parameter profile inference and a Markov chain Monte Carlo sampling of the posterior distribution for calculating uncertainties of the inference process. The inversion method shows a correct and reliable inference of temperature and impurity density profiles from synthesized data within the estimated uncertainties along the whole plasma radius. The application to measured data yields a good match of derived electron temperature profiles to data of the Thomson scattering diagnostic for central electron temperatures between 2-5 keV using argon impurities.

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A high-resolution imaging x-ray crystal spectrometer for high energy density plasmas

Cited by 17 publications

References 14 publications

Optics design of the divertor infrared television of KSTAR

Optics design of the divertor infrared television of KSTAR

High-resolution Mo Kα X-ray monochromatic backlight imaging using a toroidal crystal

Inference of temperature and density profiles via forward modeling of an x-ray imaging crystal spectrometer within the Minerva Bayesian analysis framework

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