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You searched on: Author: lawrence hudson

Displaying records 11 to 20 of 87 records.
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11. Testing Three-body Quantum Electrodynamics with Trapped Ti-20 Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation
Published: 10/10/2012
Authors: Lawrence T Hudson, C T Chantler, Mark N. Kinnane, John D Gillaspy, A.T. Payne, L F Smale, Albert Henins, Joseph N Tan, J A Kimpton, E Takacs, K Makonyi, Joshua M Pomeroy
Abstract: We report the measurement of the w (1s2p 1P1 ! 1s2 1S0) resonance line transition energy in helium-like titanium. Our result, 4749.85(7) eV, deviates from the most recent ab initio prediction by three times our experimental uncertainty and by many ...

12. Comment on ,Estimation of organ and effective dose due to Compton backscatter security scansŠ [Med. Phys. 39, 3396 (2012)]
Published: 9/1/2012
Authors: Lawrence T Hudson, Jack Leigh Glover
Abstract: In the June Issue of Medical Physics, Hoppe and Schmidt presented estimates of the organ and effective dose from an x-ray backscatter scan using a Rapiscan Secure 1000 single pose system . The paper presents Monte Carlo modeling results and takes its ...

13. Measurements and Standards for Bulk-Explosive Detection
Published: 5/31/2012
Authors: Lawrence T Hudson, Fred B Bateman, Paul Mark Bergstrom, Frank Cerra, Jack Leigh Glover, Ronaldo Minniti, Stephen Michael Seltzer, Ronald E Tosh
Abstract: Due to the ease of assembly and leveraged disruptive effect, the improvised explosive device (IED) is the method of choice of today‰s terrorist. With more than ten thousand IED incidents annually, and global expenditures for aviation and commercial s ...

14. Extending transmission crystal x-ray spectroscopy to moderate-intensity laser driven sources
Published: 3/17/2012
Authors: Lawrence T Hudson, J. Y. Mao, L. M. Chen, John F Seely, L. Zhang, Y. Q. Sun, X. X. Lin, J. Zhang
Abstract: We present spectroscopic measurements of characteristic Kα and Kβ emissions from Mo targets irradiated by a 100 fs, 200 mJ, Ti: sapphire laser with intensity of 1017 W/cm2 to 1018 W/cm2 per pulse. This research pursues novel x-ray sources f ...

15. Absolute measurements of x-ray backlighter sources at energies above 10 keVa)
Published: 2/1/2012
Authors: Lawrence T Hudson, B.R. Maddox, H.S. Parks, B A Remington, C. Chen, S Chen, S. T. Prisbrey, A. Comley, C A Back, C. Szabo, John F Seely, Uri Feldman, Stephen Michael Seltzer, M. J. Haugh, Z. Ali
Abstract: Line emission and broadband x-ray sources with x-ray energies above 10 keV have been investigated using a range of calibrated x-ray detectors for use as x-ray backlighters in high energy density (HED) experiments. The conversion efficiency of short- ...

16. Pinhole X -ray camera photos of an ECR ion source plasma
Published: 11/1/2011
Authors: Lawrence T Hudson, Sandor Biri, E Takacs, R. Racz, J. Palinkas
Abstract: A 70 micrometer pinhole and an X-ray CCD camera in single photon counting mode were used to obtain spatially and spectral resolved images of an electron cyclotron resonance (ECR) ion source generated plasma. The method has good spatial resolution as ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 ...

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