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Debris and Shrapnel Mitigation Procedure for NIF Experiments

Description: All experiments at the National Ignition Facility (NIF) will produce debris and shrapnel from vaporized, melted, or fragmented target/diagnostics components. For some experiments mitigation is needed to reduce the impact of debris and shrapnel on optics and diagnostics. The final optics, e.g., wedge focus lens, are protected by two layers of debris shields. There are 192 relatively thin (1-3 mm) disposable debris shields (DDS's) located in front of an equal number of thicker (10 mm) main debris… more
Date: September 4, 2007
Creator: Eder, D.; Koniges, A.; Landen, O.; Masters, N.; Fisher, A.; Jones, O. et al.
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Partner: UNT Libraries Government Documents Department
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High Z interaction physics on Nova

Description: A detailed understanding of the interaction of laser light with high Z materials is important for the development of indirect drive inertial confinement fusion. To improve our understanding of the interaction of 0.35 ..mu..m light at intensities between 10/sup 14/ and 10/sup 15/ W/cm/sup 2/ with high Z materials, we have performed a variety of experiments to address important physics issues. Hydrodynamics and ablation, transport processes, and x-ray conversion have been studied with thin Au dot… more
Date: August 1, 1987
Creator: Kania, D.R.; Albritton, J.; Hatcher, B.; Kauffman, R.; Kornblum, H.; Langer, S. et al.
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Partner: UNT Libraries Government Documents Department
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Blue and Green Light? Wavelength Scaling for NIF

Description: Use of the National Ignition Facility to also output frequency-doubled (.53{micro}m) laser light would allow significantly more energy to be delivered to targets as well as significantly greater bandwidth for beam smoothing. This green light option could provide access to new ICF target designs and a wider range of plasma conditions for other applications. The wavelength scaling of the interaction physics is a key issue in assessing this green light option. Wavelength scaling theory based on th… more
Date: August 21, 2003
Creator: Suter, L.; Miller, M.; Moody, J. & Kruer, W.
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Partner: UNT Libraries Government Documents Department
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Modeling the Backscatter and Transmitted Light of High Power Smoothed Beams with pF3D, a Massively Parallel Laser Plasma Interaction Code

Description: Using the three-dimensional wave propagation code, F3D[Berger et al., Phys. Fluids B 5,2243 (1993), Berger et al., Phys. Plasmas 5,4337(1998)], and the massively parallel version pF3D, [Still et al. Phys. Plasmas 7 (2000)], we have computed the transmitted and reflected light for laser and plasma conditions in experiments that simulated ignition hohlraum conditions. The frequency spectrum and the wavenumber spectrum of the transmitted light are calculated and used to identify the relative contr… more
Date: June 1, 2000
Creator: Berger, R. L.; Divol, L.; Glenzer, S.; Hinkel, D. E.; Kirkwood, R. K.; Langdon, A. B. et al.
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Partner: UNT Libraries Government Documents Department
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Exploring the Limits to NIF Capsule Coupling

Description: Our original ignition ''point designs'' (circa 1992) for the National Ignition Facility (NIF) were made energetically conservative to provide margin for uncertainties in laser absorption, x-ray conversion efficiency and hohlraum-capsule coupling. Since that time, extensive experiments on Nova and Omega and their related analysis indicate that NIF coupling efficiency may be almost ''as good as we could hope for''. Given close agreement between experiment and theory/modeling, we can credibly expl… more
Date: November 3, 1999
Creator: Suter, L.; Rothenberg, J.; Munro, D.; Van Wonterghem, B. & Haan, S.
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Partner: UNT Libraries Government Documents Department
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Electron-Density Scaling of Conversion Efficiency of Laser Energy into L-shell X-rays

Description: Laser-produced plasmas at subcritical densities have proven to be efficient sources for x-ray production. In this context, they obtain new results from experiments performed in Kr and Xe gas-filled targets that were irradiated by the high-power OMEGA (Laboratory for Laser Energetics, University of Rochester) laser. Nearly 40% of the laser energy was converted into x-rays in the L-shell-photon-energy range ({ge} 1.6 keV) by a Kr-filled target. The conversion efficiency measurements were correlat… more
Date: January 10, 2005
Creator: Fournier, K. B.; Constantin, C.; Back, C. A.; Suter, L.; Chung, H.; Miller, M. C. et al.
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Partner: UNT Libraries Government Documents Department
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Efficient Multi-keV X-ray Sources from Ti-doped Aerogel Targets

Description: We have measured the production of h{nu} {ge} 4.5 keV x-rays from low-density Ti-doped aerogel targets at the OMEGA laser facility (University of Rochester). The doped-foam density was {approx} 3 mg/cc. Forty beams of the OMEGA laser ({lambda}{sub L} = 0.351 {micro}m) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser interaction fully ionizes the target (n{sub e}/n{sub crit} {ge} 0.1), and allows the laser-bleaching wave to excite, sup… more
Date: November 21, 2003
Creator: Satcher, J.; Fournier, K.; Suter, L.; Davis, J.; Back, C.; Grun, J. et al.
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Partner: UNT Libraries Government Documents Department
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Efficient Multi-keV X-Ray Sources from Ti-Doped Aerogel Targets

Description: We have measured the production of hv {approx} 4.7 keV x-rays from low-density Ti-doped aerogel ({rho} {approx} 3 mg/cc) targets at the OMEGA laser facility (University of Rochester), with the goal of maximizing x-ray output. Forty OMEGA beams ({lambda}{sub L} = 0.351 {micro}m) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser fully ionizes the target (n{sub e}/n{sub crit} {le} 0.1), and a laser-bleaching wave excites, supersonically, … more
Date: April 9, 2004
Creator: Fournier, K.; Constantin, C.; Gregori, G.; Miller, M.; Back, C.; Suter, L. et al.
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Partner: UNT Libraries Government Documents Department
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Dante Soft X-ray Power Diagnostic for NIF

Description: Soft x-ray power diagnostics are essential for measuring spectrally resolved the total x-ray flux, radiation temperature, conversion efficiency and albedo that are important quantities for the energetics of indirect drive hohlraums. At the Nova or Omega Laser Facilities, these measurements are performed mainly with Dante, but also with DMX and photo-conductive detectors (PCD's). The Dante broadband spectrometer is a collection of absolute calibrated vacuum x-ray diodes, thin filters and x-ray m… more
Date: April 15, 2004
Creator: Dewald, E.; Campbell, K.; Turner, R.; Holder, J.; Landen, O.; Glenzer, S. et al.
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Partner: UNT Libraries Government Documents Department
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2w Laser Propagation and Raman Backscatter in Underdense Gas Bag Plasmas

Description: Recent 2{omega} gasbag experiments on the Helen laser studied single-beam propagation and backscatter as a function of gas density. We present a comprehensive analysis of these experiments using simulations in HYDRA. Post-processed results agree well with experimental fast x-ray images (FXI) showing stable laser propagation across the bag. The measured total stimulated Raman backscatter (SRS) increases with initial gas density up to n{sub e} {approx} 0.08 n{sub c}, then decreases. Near-backscat… more
Date: September 5, 2003
Creator: Meezan, N.; Divol, L.; Suter, L.; Miller, M.; Stevenson, R. M.; Slark, G. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Demonstration of reduced radiation losses in hohlraums made from cocktail mixtures by measuring increased radiation temperatures

Description: We present results from experiments, numerical simulations, and analytic modeling that demonstrate enhanced radiation confinement of hohlraums made from cocktail materials. We summarize the results from several previous planar sample experiments that showed the potential promise of cocktails. We then discuss a series of more recent hohlraum experiments that attempted to demonstrate enhanced radiation confinement. Once we understood the importance of oxygen contamination in increasing the specif… more
Date: November 3, 2006
Creator: Jones, O.; Schein, J.; Rosen, M.; Suter, L.; Wallace, R.; Dewald, E. et al.
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Partner: UNT Libraries Government Documents Department
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Ablation Front Rayleigh Taylor Dispersion Curve in Indirect Drive

Description: The Rayleigh-Taylor (RT) instability, which occurs when a lower-density fluid accelerates a higher-density layer, is common in nature. At an ablation front a sharp reduction in the growth rate of the instability at short wave-lengths can occur, in marked contrast to the classical case where growth rates are highest at the shortest wavelengths. Theoretical and numerical investigations of the ablative RT instability are numerous and differ considerably on the level of stabilization expected. We p… more
Date: November 17, 2000
Creator: Budil, K. S.; Lasinski, B.; Edwards, M. J.; Wan, A. S.; Remington, B. A.; Weber, S. V. et al.
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Partner: UNT Libraries Government Documents Department
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Recent Developments in Ignition Target Designs for the National Ignition Facility

Description: Work on design of ignition targets for the National Ignition Facility (NIF) has progressed in three areas. First, hohlraums have been re-optimized taking advantage of improvements in efficiency in several areas: use of high albedo material mixtures in the hohlraum wall; optimizing the laser entrance hole; optimizing the case-to-capsule ratio; and taking advantage of increased efficiency of longer pulses. These changes, in combination, allow for the possibility of quite high yields ({approx}100 … more
Date: September 20, 2000
Creator: Suter, L.; Haan, S.; Lindl, J.; Dittrich, T.; Hammel, B. A.; Hinkel, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Feasibility of High Yield / High Gain NIF Capsules

Description: Our original ignition ''point designs'' (circa 1992) for the National Ignition Facility (NIF) were made energetically conservative to provide margin for uncertainties in laser absorption, x-ray conversion efficiency and hohlraum-capsule coupling. Since that time, extensive experiments on Nova and Omega and their related analysis indicate that NIF coupling efficiency may be almost ''as good as we could hope for''. Given close agreement between experiment and theory/modeling, we can credibly expl… more
Date: December 6, 1999
Creator: Suter, L.; Rothenberg, J.; Munro, D.; Van Wonterghem, B.; Haan, S. & Lindl, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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0.351 micron Laser Beam propagation in High-temperature Plasmas

Description: A study of the laser-plasma interaction processes have been performed in plasmas that are created to emulate the plasma conditions in indirect drive inertial confinement fusion targets. The plasma emulator is produced in a gas-filled hohlraum; a blue 351-nm laser beam propagates along the axis of the hohlraum interacting with a high-temperature (T{sub e} = 3.5 keV), dense (n{sub e} = 5 x 10{sup 20}cm{sup -3}), long-scale length (L {approx} 2 mm) plasma. Experiments at these conditions have demo… more
Date: December 10, 2007
Creator: Froula, D.; Divol, L.; Meezan, N.; Ross, J.; Berger, R. L.; Michel, P. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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