X-ray photography of laser plasmas with the aid of analyzer crystals bent to form second-order surfaces

Belyaev, L. M.; Gil'varg, A B; Mikhaǐlov, Yu. A.; Pikuz, S. A.; Sklizkov, G. V.; Faenov, A. Ya.; Fedotov, S. I.

doi:10.1070/qe1976v006n09abeh011855

Cited by 18 publications

(5 citation statements)

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“…Therefore, from the standpoint of X-pinch diagnostics, the main attention should be paid to creating diagnostic methods for detection and analysis of UV and X-ray emission of the Х-pinch plasma. The experience gained in laser plasma studies [100][101][102][103][104][105][106][107][108][109][110][111][112][113][114][115] is widely used when developing X-ray diagnostics. However, many new methods for X-ray spectroscopy of hot plasma were implemented for the first time namely in Х-pinch experiments .…”

Section: X-ray Spectroscopymentioning

confidence: 99%

X-pinch. Part I

2015

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Results of experimental studies of the Х-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The concept of the Х-pinch arose in the course of innovative experiments on studying the generation of hot dense plasma in nanosecond Z-pinches. The main idea was to localize the region occupied by the plasma and stabilize the moment of its formation. This was achieved by using a load in the form of crossed wires. The resulting plasma object turned out to be so interesting that a new scientific direction appeared in plasma physics. At present, studies in this direction are being performed in many laboratories worldwide. The term Х-pinch became conventional, and sections devoted to its study are always present at plasma conferences. Х-pinch is not only a very interesting scientific object, but also a unique source of X-ray emission with extreme parameters. The use of Х-pinches for point-projection X-ray radiography of high-energy-density objects provided many new experimental results. In some cases, the concepts of the processes occurring in matter upon fast energy deposition changed dramatically. The review consists of two parts. The first part briefly outlines the history of creation and studies of Х-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the Х-pinch. The second part is devoted to the results of detailed studies of the Х-pinch hot spot-the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of Х-pinch simulations are also presented.

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Section: X-ray Spectroscopymentioning

confidence: 99%

X-pinch. Part I

2015

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“…13,14 They have since been used in the investigation of laser-produced plasmas, 14 exploding-wire Z pinches, and X pinches, 15,16 and are now becoming an exceptionally useful variety of instrument in the study of wirearray plasmas. Instruments that are able to provide information on the spectral and spatial structure of plasma emitting in the 1-20 Å ͑600 eV-12.4 keV͒ range are of great benefit to the diagnosis of such high-energy high-density plasmas.…”

Section: Introductionmentioning

confidence: 99%

Structure of stagnated plasma in aluminum wire array Z pinches

et al. 2006

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Experiments with aluminum wire array Z pinches have been carried out on the mega-ampere generator for plasma implosion experiments ͑MAGPIE͒ at Imperial College London ͓I. H. Mitchell et al., Rev. Sci. Instrum. 67, 1533 ͑1996͔͒. It has been shown that in these arrays, there are two intense sources of radiation during stagnation; Al XII line emission from a precursor-sized object, and both continuum and Al XIII radiation from bright spots of either significantly higher temperature or density randomly distributed around this object so as to produce a hollow emission profile. Spatially resolved spectra produced by spherically bent crystals were recorded, both time-integrated and time-resolved, and were used to show that these two sources of radiation peak at the same time.

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“…Furthermore, such spherical Bragg imagers generally have a large field of view as demonstrated in one of the earliest applications to imaging of laser plasmas where a resolution of 16 μm was achieved over a 2 mm field of view. 34 However, such Bragg imagers have a very narrow high reflectivity bandwidth on the order of 5 eV. 30…”

Section: B Incident Angle and Reflectivitymentioning

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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X-ray photography of laser plasmas with the aid of analyzer crystals bent to form second-order surfaces

Cited by 18 publications

References 0 publications

X-pinch. Part I

X-pinch. Part I

Structure of stagnated plasma in aluminum wire array Z pinches

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

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