Engineering precision relocation capability into a large-cantilevered telescoping diagnostic for a Kirkpatrick Baez x-ray Optic

Ayers, M. J.; Pickworth, L.; Decker, Todd A.; Hill, Randal M.; Pardini, T.; McCarville, T.; Shingleton, N.; Smith, C. A.; Bailey, C. G.; Bell, P. M.; Bradley, D. K.; Brejnholt, Nicolai; Hau‐Riege, Stefan P.; Pivovaroff, M. J.; Mirkarimi, Paul B.; Vitalich, M. A.; Vogel, Julia K.; Walton, Chris; Kilkenny, J. D.

doi:10.1117/12.2065253

Cited by 3 publications

(2 citation statements)

References 11 publications

(4 reference statements)

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“…To reduce the noise, the design of the imaging path will be optimzed in the next KB microscope. It is suggested to adopt a crossing aperture in the imaging path as that in reference [11,12] and enclose the mirrors module and the imaging module in a sealed tube. The calibration of the reflectivity and spatial resolution will be also implemented.…”

Section: Similarity Check Of the Images In Different Imaging Channelsmentioning

confidence: 99%

“…And it is easy to be couple to a multi-chips time gated X-ray detector, to realize the time-resolved high resolution imaging. NIF has built some 4-channels KB microscopes [1,[11][12][13] for the hot spot diagnostics and the hydrodynamic instability growth radiography. A novel 16-channels KB microscope was designed and built on OMEGA [14][15][16], which was also already coupled to the time gated X-ray detector.…”

Section: Introductionmentioning

confidence: 99%

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A four-channels reflective Kirkpatrick-Baez microscope for the hot spot diagnostic in the 100 kJ laser driven inertial confinement fusion in China

Zhang

Chen

et al. 2019

J. Inst.

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A high quality hot spot is crucial in the laser driven inertial confinement fusion. The hot spot self-emitted X-ray images in a high spatial resolution may be used to analyze the hot spot asymmetry and some fine structures induced by mix. The high spatial resolved X-ray imaging diagnostics can also serve in the hydrodynamic instability growth radiography and some other physical research in the inertial confinement fusion. The Kirkpatrick-Baez microscope can provide a higher resolution and throughput efficiency diagnostic. A new four-channels KB microscope was designed and built for the < 10 keV X-ray imaging. The Pt coated reflective mirror pairs were used to obtain a wide grazing angle bandwidth. The variation of the X-ray reflectivity was small in a large field of view. The microscope had a magnification of about 20. The spatial resolution in the central field of view was about 7 µm. The similarities between the different channel images were about 97%. The KB microscope is in operation in the directly or indirectly driven implosions by 10-100 kJ lasers on Shenguang laser facility in China. The time-integral hot spot asymmetry has been diagnosed, and the time-resolved imaging will be implemented in the following work. K: Plasma diagnostics -interferometry, spectroscopy and imaging; Plasma diagnosticshigh speed photography 1Corresponding author.

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Section: Similarity Check Of the Images In Different Imaging Channelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A four-channels reflective Kirkpatrick-Baez microscope for the hot spot diagnostic in the 100 kJ laser driven inertial confinement fusion in China

Zhang

Chen

et al. 2019

J. Inst.

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The National Ignition Facility modular Kirkpatrick-Baez microscope

Pickworth

Ayers

Bell

et al. 2016

Review of Scientific Instruments

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Current two-dimensional X-ray imaging at the National Ignition Facility (NIF) uses time resolved pinhole cameras with ∼10-25 μm pinholes. This method has limitations in the smallest resolvable features that can be imaged with reasonable photon statistics for inertial confinement fusion (ICF) applications. ICF sources have a broadband self-emission spectrum that causes the pinhole images obtained, through thin foil filters, to contain a similarly broadband spectrum complicating the interpretation of structure in the source. In order to study phenomena on the scale of ∼5 μm, such as dopant mix in the ICF capsule, a narrow energy band, higher spatial resolution microscope system with improved signal/noise has been developed using X-ray optics. Utilizing grazing incidence mirrors in a Kirkpatrick-Baez microscope (KBM) configuration [P. Kirkpatrick and A. V. Baez, J. Opt. Soc. Am. 38, 766-774 (1948)], an X-ray microscope has been designed and fielded on NIF with four imaging channels. The KBM has ∼12 × magnification, <8 μm resolution, and higher throughput in comparison to similar pinhole systems. The first KBM mirrors are coated with a multilayer mirror to allow a "narrow band" energy response at 10.2 keV with ΔE ∼ 3 keV. By adjusting the mirror coating only, the energy response can be matched to the future experimental requirements. Several mirror packs have been commissioned and are interchangeable in the diagnostic snout.

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Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility

et al. 2018

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High-mode perturbations and low-mode asymmetries were measured in the deceleration phase of indirectly driven, deuterium gas filled inertial confinement fusion capsule implosions at convergence ratios of 10 to 15, using a new “enhanced emission” technique at the National Ignition Facility [E. M. Campbell et al., AIP Conf. Proc. 429, 3 (1998)]. In these experiments, a high spatial resolution Kirkpatrick-Baez microscope was used to image the x-ray emission from the inner surface of a high-density-carbon capsule's shell. The use of a high atomic number dopant in the shell enabled time-resolved observations of shell perturbations penetrating into the hot spot. This allowed the effects of the perturbations and asymmetries on degrading neutron yield to be directly measured. In particular, mix induced radiation losses of ∼400 J from the hot spot resulted in a neutron yield reduction of a factor of ∼2. In a subsequent experiment with a significantly increased level of short-mode initial perturbations, shown through the enhanced imaging technique to be highly organized radially, the neutron yield dropped an additional factor of ∼2.

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Engineering precision relocation capability into a large-cantilevered telescoping diagnostic for a Kirkpatrick Baez x-ray Optic

Cited by 3 publications

References 11 publications

A four-channels reflective Kirkpatrick-Baez microscope for the hot spot diagnostic in the 100 kJ laser driven inertial confinement fusion in China

A four-channels reflective Kirkpatrick-Baez microscope for the hot spot diagnostic in the 100 kJ laser driven inertial confinement fusion in China

The National Ignition Facility modular Kirkpatrick-Baez microscope

Visualizing deceleration-phase instabilities in inertial confinement fusion implosions using an “enhanced self-emission” technique at the National Ignition Facility

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