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Author: lawrence hudson

Displaying records 11 to 20 of 82 records.
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11. Energetic Photon Spectra from Targets Irradiated by Picoseconds Lasers
Published: 4/30/2011
Authors: Lawrence T Hudson, John F Seely, Csilla Szabo, Uri Feldman, Hui Chen, Albert Henins
Abstract: Photon spectra in the energy range 60 keV to 1 MeV were recorded from targets irradiated by the LLNL Titan and LLE EP picosecond lasers. The radiation consisted of K shell radiation, Bremsstrahlung radiation from MeV electrons, and preliminary eviden ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907778

12. Efficiency calibrations of cylindrically bent transmission crystals in the 20 keV to 80 keV x-ray range
Published: 4/15/2011
Authors: Lawrence T Hudson, C Michelle O'Brien, Uri Feldman, Stephen M. Seltzer, Hye-Sook Park, John F Seely
Abstract: Two quartz (10-11) crystals were cylindrically bent to 25.4 cm radius of curvature and were mounted in identical Cauchois type transmission spectrometers, and the crystal diffraction efficiencies were measured to 5 % absolute accuracy using narrow ba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907535

13. Scaling studies with the dual crystal spectrometer at the OMEGA-EP laser facility
Published: 10/26/2010
Authors: Lawrence T Hudson, C.I Szabo, J. Workman, K. Flippo, Uri Feldman, Albert Henins
Abstract: The dual crystal spectrometer (DCS) is an approved diagnostic at the OMEGA and the OMEGA-EP laser facilities for the measurement of high energy x-rays in the 11 90 keV energy range, e.g., for verification of the x-ray spectrum of backlighter target ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907469

14. Asymmetrically cut crystal pair as x-ray magnifier for imaging at high intensity laser facilities.
Published: 10/20/2010
Authors: Lawrence T Hudson, Albert Henins, C.I Szabo, Uri Feldman, John F Seely, John J Curry
Abstract: The potential of an x-ray magnifier prepared from a pair of asymmetrically cut crystals is studied to explore high energy x-ray imaging capabilities at high intensity laser facilities. OMEGA-EP and NIF when irradiating mid and high Z targets can be ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907468

15. Laser-produced MeV electrons and hard X-ray spectroscopic diagnostics
Published: 7/21/2010
Authors: Lawrence T Hudson, John F Seely
Abstract: A new spectroscopic technique for the measurement of the sizes of hard X-ray sources produced by the irradiation of solid-density targets by intense laser radiation is discussed. The technique is based on the source broadening of K shell spectral li ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907449

16. High contract femtosecond laser-driven intense hard X-ray source for imaging application
Published: 11/18/2009
Authors: Lawrence T Hudson, L.M Chen, W.M. Wang, M. Kando, F Liu, X.X. Lin, J.L Ma, Y.T. Li, S.V. Bulanvo, T. Tajima, Y. Kato, Z.M. Sheng, J Zhang
Abstract: In this report we address the current situation of laser-driven hard X-ray sources for imaging applications,especially the saturation of X-ray conversion efficiency and the serious impact upon imaging quality.By employing high contrast laser pulses ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907448

17. X-ray measurements at high-power lasers
Published: 5/1/2009
Authors: Lawrence T Hudson, C.I Szabo, Paul Indelicato, G.E. Gumberidze, G Holland, John F Seely, Albert Henins, M Audebert, S. Bastiani-Ceccotti, E. Tabakhoff, E. Brambrink
Abstract: Conversion efficiencies of laser light into K x-ray radiation are used to characterize laser-solid interactions e.g. in measurements with back-lighter targets in Inertial Confinement Fusion research or in ultra short x-ray science where ultra short l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842572

18. Analysis of ISCD-NIST Survey for Bone Health
Published: 4/1/2009
Authors: Andrew M Dienstfrey, Tammy L. Oreskovic, Herbert S Bennett, Lawrence T Hudson
Abstract: In 2007, the National Institute of Standards and Technology and the International Society for Clinical Densitometry designed a survey to prioritize seven research and standardization action items intended to improve accuracy and cross-comparability o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=890044

19. Laser-produced X-Ray Sources
Published: 1/12/2009
Authors: Lawrence T Hudson, J Seely
Abstract: A formidable array of advanced laser systems are emerging that produce extreme states of light and matter. By irradiating solid and gaseous targets with lasers of increasing energy densities, new physical regimes of radiation effects are being explor ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901410

20. Development of backlighting sources for Compton radiography diagnostic of Inertial Confinement Fusion targets.
Published: 12/8/2008
Authors: Lawrence T Hudson, A. Tommasini, A MacPhee, D. Hey, T Ma, C. Chen, N Izimi, W Unites, A. MacKinnon, P. Hatchett, B.A. Remington, H.S. Park, P. Springer, J.A. Koch, O.L. Landen, John F Seely, G Holland
Abstract: We present scaled demonstrations of backlighter sources, emitting Bremsstrahlung x rays with photon energies above 75 keV, that we will use to record x-ray Compton radiographic snapshots of cold dense DT fuel in inertial confinement fusion implosions ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842500



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