Large-field high-resolution x-ray microscope for studying laser plasmas

Sauneuf, R.; Dalmasso, J. M.; Jalinaud, T.; Breton, Jean-Pierre Le; Schirmann, D.; Marioge, J P; Bridou, Françoise; Tissot, Jean‐Daniel; Clotaire, Jean-Yves

doi:10.1063/1.1148302

Cited by 39 publications

(18 citation statements)

References 3 publications

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“…3͒ is used to image the laser-plasma x-ray source on a streak camera. These microscopes are inspired by the KirkpatrickBaez Amélioré ͑improved KB͒ ͑KBA͒ design, 9 dimensional x-ray imager. The four spherical mirrors of the KBA reduce the field obliquity that limits the field of view of KB systems, made by two mirrors.…”

Section: The Microscope Designmentioning

confidence: 99%

X-ray imaging with grazing-incidence microscopes developed for the LIL program

Rosch

Boutin

Breton

et al. 2007

Review of Scientific Instruments

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This article describes x-ray imaging with grazing-incidence microscopes, developed for the experimental program carried out on the Ligne d'Integration Laser (LIL) facility [J. P. Le Breton et al., Inertial Fusion Sciences and Applications 2001 (Elsevier, Paris, 2002), pp. 856-862] (24 kJ, UV-0.35 nm). The design includes a large target-to-microscope (400-700 mm) distance required by the x-ray ablation issues anticipated on the Laser MégaJoule facility [P. A. Holstein et al., Laser Part. Beams 17, 403 (1999)] (1.8 MJ) which is under construction. Two eight-image Kirkpatrick-Baez microscopes [P. Kirkpatrick and A. V. Baez J. Opt. Soc. Am. 38, 766 (1948)] with different spectral wavelength ranges and with a 400 mm source-to-mirror distance image the target on a custom-built framing camera (time resolution of approximately 80 ps). The soft x-ray version microscope is sensitive below 1 keV and its spatial resolution is better than 30 microm over a 2-mm-diam region. The hard x-ray version microscope has a 10 microm resolution over an 800-microm-diam region and is sensitive in the 1-5 keV energy range. Two other x-ray microscopes based on an association of toroidal/spherical surfaces (T/S microscopes) produce an image on a streak camera with a spatial resolution better than 30 microm over a 3 mm field of view in the direction of the camera slit. Both microscopes have been designed to have, respectively, a maximum sensitivity in the 0.1-1 and 1-5 keV energy range. We present the original design of these four microscopes and their test on a dc x-ray tube in the laboratory. The diagnostics were successfully used on LIL first experiments early in 2005. Results of soft x-ray imaging of a radiative jet during conical shaped laser interaction are shown.

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Section: The Microscope Designmentioning

confidence: 99%

X-ray imaging with grazing-incidence microscopes developed for the LIL program

Rosch

Boutin

Breton

et al. 2007

Review of Scientific Instruments

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“…Dans la même optique, une autre possibilité pour s'affranchir des défauts d'image et de la faible ouverture des systèmes de type KB, consiste à utiliser non plus 2 mais 4 miroirs croisés 2 à 2 conformément à la Figure 6 ; Ce système optique appelé un KBA (pour KB Amélioré) a été réalisée par l'IOTA * en 1992 [5]. Ce microscope a des propriétés optiques très intéressantes pour l'imagerie X en 2D de par son grand champ et sa très haute résolution (de l'ordre de 7 m dans un champ de 2 mm).…”

Section: Le Microscope De Type Kbaunclassified

Systèmes d'imagerie à haute résolution dans le domaine des Rayons X pour le Laser Mégajoule

et al. 2006

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Résumé. Le principe de la fusion par confinement inertiel consiste à faire imploser une cible sphérique de petite taille, millimétrique, remplie d'un mélange de deutérium et de tritium sous l'action des 240 faisceaux lasers impulsionnels de très grande puissance du LMJ. Les études de cette physique d'implosion (mise en vitesse, symétrie d'implosion, instabilités hydrodynamiques) et de l'allumage (traceurs, point chaud) font appel aux techniques de l'imagerie et de la radiographie à haute résolution spatiale ( m) et temporelle (ps) avec sélection spectrale dans le domaine d'énergie de photons comprise entre 100 eV et 20 keV. Plusieurs Systèmes d'Imagerie X (SIX), à haute résolution spatiale, ont donc été développés par le CEA-DIF et mis en oeuvre sur la Ligne d'Intégration Laser (LIL) implantée au CEA-CESTA. Dans cet article nous présentons les principaux SIX, à base de microscopes à miroirs. Un exemple de microscope prototype nommé PIXEL (Plasma Imageur X pour les Expériences Lasers) développé pour le LMJ est présenté. Nous portons l'accent sur les problèmes technologiques liés à l'environnement LMJ.

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“…Such a scheme uses two mirrors in succession for each plane, and provides good resolution over a larger field of view by canceling to first order the field obliquity or angular defocusing inherent in the KB design. This technique was first suggested by Dyson 18 and later realized by Sauneuf et al 19 The difficulty inherent in aligning such a microscope is discussed in Ref. 17.…”

Section: Introductionmentioning

confidence: 99%

Kirkpatrick-Baez microscope for hard X-ray imaging of fast ignition experiments

Friesen

Tiedje

Hey

et al. 2013

Review of Scientific Instruments

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A Kirkpatrick-Baez X-ray microscope has been developed for use on the Titan laser facility at the Lawrence Livermore National Laboratory in Fast Ignition experiments. It was developed as a broadband alternative to narrow band Bragg crystal imagers for imaging Kα emission from tracer layers. A re-entrant design is employed which allows for alignment from outside the chamber. The mirrors are coated with Pt and operate at a grazing incident angle of 0.5° providing higher resolution than an equal brightness pinhole and sufficient bandwidth to image thermally shifted characteristic Kα emission from heated Cu tracer layers in Fast Ignition experiments. The superpolished substrates (<1 Å rms roughness) had a final visible wavelength roughness of 1.7 Å after coating, and exhibited a reflectivity corresponding to an X-ray wavelength roughness of 7 ± 1 Å. A unique feature of this design is that during experiments, the unfiltered direct signal along with the one-dimensional reflections are retained on the detector in order to enable a live indication of alignment and incident angle. The broad spectral window from 4 to 9 keV enables simultaneous observation of emission from several spectral regions of interest, which has been demonstrated to be particularly useful for cone-wire targets. An experimentally measured resolution of 15 μm has been obtained at the center of the field of view.

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Large-field high-resolution x-ray microscope for studying laser plasmas

Cited by 39 publications

References 3 publications

X-ray imaging with grazing-incidence microscopes developed for the LIL program

X-ray imaging with grazing-incidence microscopes developed for the LIL program

Systèmes d'imagerie à haute résolution dans le domaine des Rayons X pour le Laser Mégajoule

Kirkpatrick-Baez microscope for hard X-ray imaging of fast ignition experiments

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