Monochromatic x-ray imaging with bent crystals for laser fusion research

Fujita, Kazuhisa; Nishimura, Hiroaki; Niki, I.; Funakura, Jiro; Uschmann, I.; Butzbach, R.; Förster, E.; Nakai, M.; Fukao, M.; Sunahara, A.; Takabe, H.; Yamanaka, Tatsuhiko

doi:10.1063/1.1318261

Cited by 20 publications

(5 citation statements)

References 10 publications

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“…Also, another 2D-SIXS, which was coupled with a high-spatial-resolution monochromatic x-ray imager [17], was developed for time resolved x-ray line-emission images [13]. Two toroidally bent Bragg crystals (Quartz) were used for making spectrally selected monochromatic images at certain line emission spectra from the target material.…”

Section: Framing Interval= 8opsmentioning

confidence: 99%

Implosion and heating diagnostics of fast ignition laser fusion target with ultra-high-speed x-ray imaging

et al. 2008

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Implosion and heating experiments of Fast Ignition (FI) targets for FIREX-1 laser fusion project have been performed with Gekko-XII and PW/LFEX lasers at the Institute of Laser Engineering, Osaka University. Typical FI target has a hollow cone for guiding the short-pulse heating laser beam at the time of the maximum compression. The cone is mounted so as to in one-side penetrate the shell target. Detailed implosion hydrodynamics, FI heating and core plasma formation of plastic (CD) shell target with gold cone have been clarified by observing those with ultra high-speed imaging x-ray spectroscopy as well as neutron diagnostics. Multi-channel Multi-Imaging X-Ray Streak Camera (McMIXS) was improved for observation of time-resolved x-ray images and time-resolved two dimensional temperature distributions with spatial and temporal resolutions of 20 microns and 24 ps (42 Gfps), respectively. With this instrument, one can observe heating properties of the imploded core such as spatial distribution of the heated region and its temporal evolution. Also 2D-SIXS (Two-Dimensional Sampling Image X-ray Streak camera) coupled with an x-ray imager was improved for time resolved x-ray imaging of the imploded core. Synchronization of the heating beam injection to the implosion dynamics has been monitored with an x-ray framing camera. It was found that the shape of the core is neither spherical nor uniform mainly because of the existence of the cone and moving toward the tip of the cone and interacting with it. Experimental results are compared with two-dimensional hydrodynamic simulations. Target design taking into account of these phenomena is quite important because such core movement and jet formation can affect the condition of the cone.

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Section: Framing Interval= 8opsmentioning

confidence: 99%

Implosion and heating diagnostics of fast ignition laser fusion target with ultra-high-speed x-ray imaging

et al. 2008

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“…Toroidal crystals have been previously used in low-energy X-ray imaging experiments. For example, Fujita et al [18,19] used a Ge h3 1 1i toroidal crystal to achieve highresolution imaging at 3.68 keV. Jiang et al [20] developed a four-channel Ge h4 0 0i toroidal-crystal X-ray imager for the Ti Kα1 characteristic line (4.51 keV), and they achieved a four-channel spatial resolution of 4.0-9.2 μm in X-ray imaging experiments.…”

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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“…Here we used two dimensionally distributed 40 x 39 pinholes to sample a 2D x-ray image on the cathode plane of an x-ray streak camera. Also, another 2D-SIXS, which was coupled with a high-spatialresolution monochromatic x-ray imager [17], was developed for time resolved x-ray lineemission images [13]. Two toroidally bent Bragg crystals (Quartz) were used for making spectrally selected monochromatic images at certain line emission spectra from the target material.…”

Section: Fast Imaging X-ray Spectroscopy Of the Imploded Corementioning

confidence: 99%

Implosion and heating experiments of fast ignition targets for FIREX-1 project

Shiraga

2009

2009 Conference on Lasers &Amp; Electro Optics &Amp; The Pacific Rim Conference on Lasers and Electro-Optics

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Abstract. Implosion and heating experiments of Fast Ignition (FI) targets for FIREX-1 project have been performed with Gekko-XII and PW/LFEX lasers at the Institute of Laser Engineering, Osaka University. Typical FI target has a hollow cone for guiding the short-pulse heating laser beam at the time of the maximum compression. The cone is mounted so as to in one-side penetrate the shell target. Detailed implosion hydrodynamics, FI heating and core plasma formation of plastic (CD) shell target with gold cone have been clarified by observing those with fast imaging x-ray spectroscopy and neutron diagnostics. A new OneDimensional and Multi-channel Multi-Imaging X-Ray Streak Camera (1D+McMIXS) was developed for observation of time-resolved two-dimensional x-ray images and time-resolved two dimensional temperature distributions. Also, a monochromatic x-ray imager coupled with 2D-SIXS (Two-Dimensional Sampling Image X-ray Streak camera) was developed for time resolved x-ray line-emission imaging. Synchronization of the heating beam injection to the implosion dynamics has been monitored with an x-ray framing camera. With these instruments, one can observe heating properties of the imploded core such as spatial distribution of the heated region and its temporal evolution. It was found that the shape of the core is neither spherical nor uniform mainly because of the existence of the cone and moving toward the tip of the cone and interacting with it. Experimental results are compared with two-dimensional hydrodynamic simulations. Target design taking into account of these phenomena is quite important because such core movement and jet formation can affect the condition of the cone.

show abstract

Monochromatic x-ray imaging with bent crystals for laser fusion research

Cited by 20 publications

References 10 publications

Implosion and heating diagnostics of fast ignition laser fusion target with ultra-high-speed x-ray imaging

Implosion and heating diagnostics of fast ignition laser fusion target with ultra-high-speed x-ray imaging

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

Implosion and heating experiments of fast ignition targets for FIREX-1 project

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