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A Filter-Fluorescer Diagnostic System (FFLEX) for the National Ignition Facility (NIF)

Description: An early Filter-Fluorescer Diagnostic System (FFLEX) is being fielded at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) to measure the amount of hard x-rays (20 < hv < 150 keV) generated in laser fusion experiments. From these measurements we hope to quantify the number of hot (20 to 50 keV) electrons produced in laser fusion experiments. The Measurement of hot electron production is important for ignition experiments because these electrons can preh… more
Date: April 13, 2004
Creator: McDonald, J. W.; Kauffman, R. L.; Celeste, J. R.; Rhodes, M. A.; Lee, F. D.; Suter, L. J. et al.
Partner: UNT Libraries Government Documents Department
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X-Ray Backlighting for the National Ignition Facility

Description: X-ray backlighting is a powerful tool for diagnosing a large variety of high-energy-density phenomena. Traditional area backlighting techniques used at Nova and Omega cannot be extended efficiently to NIF-scale. New, more efficient backlighting sources and techniques are required and have begun to show promising results. These include a backlit-pinhole point projection technique, pinhole and slit arrays, distributed polychromatic sources, and picket fence backlighters. In parallel, there have b… more
Date: July 25, 2000
Creator: Landen, O. L.; Farley, D. R.; Glendinning, S. G.; Logory, E. M.; Bell, P. M.; Koch, J. A. et al.
Partner: UNT Libraries Government Documents Department
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Progress in Long Scale Length Laser-Plasma Interactions

Description: The first experiments on the National Ignition Facility (NIF) have employed the first four beams to measure propagation and laser backscattering losses in large ignition-size plasmas. Gas-filled targets between 2 mm and 7 mm length have been heated from one side by overlapping the focal spots of the four beams from one quad operated at 351 nm (3{omega}) with a total intensity of 2 x 10{sup 15} W cm{sup -2}. The targets were filled with 1 atm of CO{sub 2} producing of up to 7 mm long homogeneous… more
Date: November 11, 2003
Creator: Glenzer, S. H.; Arnold, P.; Bardsley, G.; Berger, R. L.; Bonanno, G.; Borger, T. et al.
Partner: UNT Libraries Government Documents Department
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Laser Coupling to Reduced-Scale Targets at the Early Light Program of the National Ignition Facility

Description: A platform for analysis of material properties under extreme conditions, where a sample is bathed in radiation with a high temperature, is under development. This hot environment is produced with a laser by depositing maximum energy into a small, high-Z can. Such targets were recently included in an experimental campaign using the first four of the 192 beams of the National Ignition Facility, under construction at the University of California Lawrence Livermore National Laboratory. These target… more
Date: November 18, 2004
Creator: Hinkel, D. E.; Schneider, M. B.; Baldis, H. A.; Bower, D.; Campbell, K. M.; Celeste, J. R. et al.
Partner: UNT Libraries Government Documents Department
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Ground-penetrating radar for buried mine detection

Description: Lawrence Livermore National Laboratory (LLNL) is developing an ultra-wideband, side-looking, ground-penetrating impulse radar system that can be mounted on an airborne platform for the purpose of locating buried mines. The radar system is presently mounted on an 18-meter boom. The authors have successfully imaged a minefield located at the Nevada Test Site. The minefield consists of real and surrogate mines of various materials and sizes placed in natural vegetation. Some areas have been cleare… more
Date: April 1, 1994
Creator: Sargis, P. D.; Lee, F. D.; Fulkerson, E. S.; McKinley, B. J. & Aimonetti, W. D.
Partner: UNT Libraries Government Documents Department
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Operating experience with the 50 MeV 10kA ATA power conditioning system

Description: The Advanced Test Accelerator (ATA) has been operational for over one year and has achieved full parameters in the power conditioning system. The pulsed power system has been previously described, however, during the past year of operation a considerable amount of statistical data has been accumulated on the 211 gas blown spark gaps that perform the main switching function in the ATA. These spark gaps were designed for 250kV, 40 kA and 70ns pulse. The parameter that made this spark gap somewhat… more
Date: June 1, 1984
Creator: Rogers, D.; Lee, F. D.; Newton, M.; Reginato, L.L. & Smith, M.E.
Partner: UNT Libraries Government Documents Department
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Power-conditioning system for the Advanced Test Accelerator

Description: The Advanced Test Accelerator (ATA) is a pulsed, linear induction, electron accelerator currently under construction and nearing completion at Lawrence Livermore National Laboratory's Site 300 near Livermore, California. The ATA is a 50 MeV, 10 kA machine capable of generating electron beam pulses at a 1 kHz rate in a 10 pulse burst, 5 pps average, with a pulse width of 70 ns FWHM. Ten 18 kV power supplies are used to charge 25 capacitor banks with a total energy storage of 8 megajoules. Energy… more
Date: June 1, 1982
Creator: Newton, M. A.; Smith, M. E.; Birx, D. L.; Branum, D. R.; Cook, E. G.; Copp, R. L. et al.
Partner: UNT Libraries Government Documents Department
open access

Laser coupling to reduced-scale targets at NIF Early Light

Description: Deposition of maximum laser energy into a small, high-Z enclosure in a short laser pulse creates a hot environment. Such targets were recently included in an experimental campaign using the first four of the 192 beams of the National Ignition Facility [J. A. Paisner, E. M. Campbell, and W. J. Hogan, Fusion Technology 26, 755 (1994)], under construction at the University of California Lawrence Livermore National Laboratory. These targets demonstrate good laser coupling, reaching a radiation temp… more
Date: August 31, 2005
Creator: Hinkel, D. E.; Schneider, M. B.; Young, B. K.; Holder, J. P.; Langdon, A. B.; Baldis, H. A. et al.
Partner: UNT Libraries Government Documents Department
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Hard X-ray and Hot Electron Environment in Vacuum Hohlraums at NIF

Description: Time resolved hard x-ray images (hv > 9 keV) and time integrated hard x-ray spectra (hv = 18-150 keV) from vacuum hohlraums irradiated with four 351 nm wavelength NIF laser beams are presented as a function of hohlraum size and laser power and duration. The hard x-ray images and spectra provide insight into the time evolution of the hohlraum plasma filling and the production of hot electrons. The fraction of laser energy detected as hot electrons (f{sub hot}) and a comparison to a filling mo… more
Date: September 22, 2005
Creator: McDonald, J. W.; Suter, L. J.; Landen, O. L.; Foster, J. M.; Celeste, J. R.; Holder, J. P. et al.
Partner: UNT Libraries Government Documents Department
open access

IMPACT OF NEUTRON AND GAMMA RADIATION ON THE DESIGN OF DIAGNOSTICS AND OTHER TARGET-BAY SYSTEMS

Description: The design of a wide range of components in and near the target bay of the National Ignition Facility (NIF) must allow for significant radiation from neutrons and gammas. Detailed 3D Monte Carlo simulations are critical to determine neutron and gamma fluxes for all target-bay components to allow optimization of location and auxiliary shielding. Demonstration of ignition poses unique challenges because of the large range ({approx}3 orders of magnitude) in the yield for any given attempt at ignit… more
Date: September 1, 2005
Creator: Eder, D C; Song, P M; Latkowski, J F; Reyes, S; O'Brien, D W; Lee, F D et al.
Partner: UNT Libraries Government Documents Department
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Livermore Imaging Fourier Transform Infrared Spectrometer (LIFTIRS)

Description: Lawrence Livermore National Laboratory is currently operating a hyperspectral imager, the Livermore Imaging Fourier Transform Infrared Spectrometer (LIFTIRS). This instrument is capable of operating throughout the infrared spectrum from 3 to 12.5 {mu}m with controllable spectral resolution. In this presentation we report on it`s operating characteristics, current capabilities, data throughput and calibration issues.
Date: May 10, 1995
Creator: Carter, M. R.; Bennett, C. L.; Fields, D. J. & Lee, F. D.
Partner: UNT Libraries Government Documents Department
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Target experimental area and systems of the U.S. National Ignition Facility

Description: One of the major goals of the US National Ignition Facility is the demonstration of laser driven fusion ignition and burn of targets by inertial confinement and provide capability for a wide variety of high energy density physics experiments. The NIF target area houses the optical systems required to focus the 192 beamlets to a target precisely positioned at the center of the 10 meter diameter, 10-cm thick aluminum target chamber. The chamber serves as mounting surface for the 48 final optics a… more
Date: December 17, 1999
Creator: Tobin, M.; Van Wonterghem, B.; MacGowan, B. J.; Hibbard, W.; Kalantar, D.; Lee, F. D. et al.
Partner: UNT Libraries Government Documents Department
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Development and characterization of a CCD camera system for use on six-inch manipulator systems

Description: The Lawrence Livermore National Laboratory has designed, constructed, and fielded a compact CCD camera system for use on the Six Inch Manipulator (SIM) at the Nova laser facility. The camera system has been designed to directly replace the 35 mm film packages on all active SIM-based diagnostics. The unit`s electronic package is constructed for small size and high thermal conductivity using proprietary printed circuit board technology, thus reducing the size of the overall camera and improving i… more
Date: May 3, 1996
Creator: Logory, L. M.; Bell, P. M.; Conder, A. D. & Lee, F. D.
Partner: UNT Libraries Government Documents Department
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LDRD 93-ERP-166 Final report

Description: In this article, recent measurements made with LIFTIRS, the Livermore Imaging Fourier Transform Infrared Spectrometer, are presented. The experience gained with this instrument has produced a variety of insights into the tradeoffs-between signal to noise ratio (SNR), spectral resolution and temporal resolution for time multiplexed Fourier transform imaging spectrometers. This experience has also clarified the practical advantages and disadvantages of Fourier transform hyperspectral imaging spec… more
Date: July 1, 1995
Creator: Bennett, C. L.; Carter, M. R.; Fields, D. J. & Lee, F. D.
Partner: UNT Libraries Government Documents Department
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Safeguards and Security FY 1996 Program Plan: WBS 6.6

Description: The Safeguards and Security (SAS) Program is based upon integrity, competence and innovation in the protection of the public and Hanford resources through: (1) outstanding assistance, oversight, education, and counsel to their customers to ensure the protection of the public, site personnel, assets, and information; (2) value-added and cost-effective solutions to Hanford issues; and (3) risk management techniques to ensure effective asset protection, site accessibility, and the flexibility to a… more
Date: August 1, 1995
Creator: Lee, F. D.
Partner: UNT Libraries Government Documents Department
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