High-resolution 17–75 keV backlighters for high energy density experiments

Park, H.-S.; Maddox, B. R.; Giraldez, E.; Hatchett, S. P.; Hudson, L. T.; Izumi, N.; Key, M. H.; Le Pape, S.; MacKinnon, A. J.; MacPhee, A. G.; Patel, P. K.; Phillips, T. W.; Remington, B. A.; Seely, J. F.; Tommasini, R.; Town, R.; Workman, J.; Brambrink, E.
July 2008
Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072705
Academic Journal
17–75 keV one- and two-dimensional high-resolution (<10 μm) radiography has been developed using high-intensity short pulse lasers. High energy Kα sources are created by fluorescence from hot electrons interacting in the target material after irradiation by lasers with intensity IL>1017 W/cm2. High-resolution point projection one- and two-dimensional radiography has been achieved using microfoil and microwire targets attached to low-Z substrate materials. The microwire size was 10 μm×10 μm×300 μm on a 300 μm×300 μm×5 μm polystyrene substrate. The radiography experiments were performed using the Titan laser at Lawrence Livermore National Laboratory. The results show that the resolution is dominated by the microwire target size and there is very little degradation from the plasma plume, implying that the high-energy x-ray photons are generated mostly within the microwire volume. There are enough Kα photons created with a 300 J, 1-ω, 40 ps pulse laser from these small volume targets, and that the signal-to-noise ratio is sufficiently high, for single shot radiography experiments. This unique technique will be used on future high energy density experiments at many new high-power laser facilities.


Related Articles

  • Laser Experiments for High Energy Density Science. Kumar, G. Ravindra // AIP Conference Proceedings;11/23/2010, Vol. 1308 Issue 1, p46 

    High energy density science probes some of the most basic scientific questions that cut across traditional disciplines. The advent of table top, terawatt, femtosecond lasers promises to revolutionize this area by the use of precise experimental techniques on the one hand and testing of models...

  • Development and applications of monochromatic x-ray imaging. Ridgeley, A. // Review of Scientific Instruments;Aug1986, Vol. 57 Issue 8, p2198 

    An ideal plasma diagnostics device would resolve in five dimensions, three spatial, one time, and one energy. Traditional x-ray plasma diagnostics devices resolve in only one or two dimensions. It is possible to devise diagnostic equipment to resolve three parameters simultaneously. The means by...

  • Enhancement of Laser Injection Methods by Plasma Density Gradients. Fubiani, G.; Esarey, E.; Nakamura, K.; Schroeder, C. B.; Leemans, W. P. // AIP Conference Proceedings;2004, Vol. 737 Issue 1, p887 

    Plasma density down-ramps are proposed as a method for improving the performance of laser injection schemes. A decrease in density implies an increase in plasma wavelength, which can shift a relativistic electron from the defocusing to the focusing region of the accelerating wakefield. Also, a...

  • A Panoramic Plasma Spectrometer: An All-Sky Camera for Charged Particles. Vaisberg, O. L.; Avanov, L. A.; Leibov, A. V.; Smirnov, V. N.; Keller, J.; Moore, T.; Chornay, D.; Collier, M.; Troshin, V. S.; Myagkikh, V. D. // Cosmic Research;Sep2005, Vol. 43 Issue 5, p373 

    The article discusses the principle of operation and the testing of a panoramic plasma spectrometer which is a miniature electro-optic system that guarantees 2Ï€ field of view with a single coordinate-sensitive detector. Basically, this is an all-sky camera for charged particles. The feed...

  • Photonics: Illumination for atomic movies. Pellegrini, Claudio // Nature;9/18/2008, Vol. 455 Issue 7211, p297 

    The article elaborates on the study conducted by scientists on the significance of free-electron lasers (FEL) to the scientific community in the U.S. It has been a dream of scientists to have a video camera where they can record individual atoms and their motions, or even to follow electrons...

  • High-harmonic generation in cavitated plasmas. Schroeder, C. B.; Esarey, E.; Comier-Michel, E.; Leemans, W. P. // Physics of Plasmas;May2008, Vol. 15 Issue 5, p056704 

    A method is proposed for producing coherent x-rays via high-harmonic generation using ultraintense lasers interacting with highly stripped ions in cavitated plasmas. This method relies on plasma cavitation by the wake of an intense drive beam (laser or electron beam) to produce an ion cavity. An...

  • Measurements of neutron emission from a Z-pinch constriction. Bakshaev, Yu.; Blinov, P.; Vikhrev, V.; Dan�ko, S.; Korolev, V.; Meshcherov, B.; Nedoseev, S.; Smirnova, E.; Ustroev, G.; Chernenko, A.; Shashkov, A. // Plasma Physics Reports;Jul2006, Vol. 32 Issue 7, p531 

    Results are presented from measurements of neutron emission generated during discharges with current amplitudes of up to 3 MA and a current rise time of ~100 ns through profiled loads 10 mm in height and 4�5 mm in diameter. The experiments were performed with the S-300 eight-module...

  • Characteristic measurements of silicon dioxide aerogel plasmas generated in a Planckian radiation environment. Quan-Li Dong; Shou-Jun Wang; Yu-Tong Li; Yi Zhang; Jing Zhao; Hui-Gang Wei; Jian-Rong Shi; Gang Zhao; Ji-Yan Zhang; Yu-Qiu Gu; Yong-Kun Ding; Tian-Shu Wen; Wen-Hai Zhang; Xin Hu; Shen-Ye Liu; Lin Zhang; Yong-Jian Tang; Bao-Han Zhang; Zhi-Jian Zheng; Hiroaki Nishimura // Physics of Plasmas;Jan2010, Vol. 17 Issue 1, p012701 

    The temporally and spatially resolved characteristics of silicon dioxide aerogel plasmas were studied using x-ray spectroscopy. The plasma was generated in the near-Planckian radiation environment within gold hohlraum targets irradiated by laser pulses with a total energy of 2.4 kJ in 1 ns. The...

  • Multi-dimensional high energy density physics modeling and simulation of wire array Z-pinch physics. Garasi, C. J.; Bliss, D. E.; Mehlhom, T. A.; Oliver, B. V.; Robinson, A. C.; Sarkisov, G. S. // Physics of Plasmas;May2004, Vol. 11 Issue 5, p2729 

    The two- and three-dimensional (2D and 3D) versions of ALEGRA-HEDP [A. C. Robinson and C. J. Garasi, ''Three-dimensional Z-pinch wire array modeling,'' Computer Physics Communications, submitted] have been utilized to simulate discrete wire effects including precursor formation in 2D (r-θ...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics