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Your search keyword '"Bower, D. E."' showing total 19 results
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19 results on '"Bower, D. E."'

7. UPSTATE

Author

BOWER, D. E.

Published
1944

8. The 27.3 meter neutron time-of-flight system for the National Ignition Facility

Author

Grim, G. P., additional, Morgan, G. L., additional, Aragonez, R., additional, Archuleta, T. N., additional, Bower, D. E., additional, Danly, C. R., additional, Drury, O. B., additional, Dzenitis, J. M., additional, Fatherley, V. E., additional, Felker, B., additional, Fittinghoff, D. N., additional, Guler, N., additional, Merrill, F. E., additional, Oertel, J. A., additional, Wilde, C. H., additional, and Wilke, M. D., additional

Published
2013
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9. The neutron imaging system fielded at the National Ignition Facility.

Author

Fittinghoff, D. N., Atkinson, D. P., Bower, D. E., Drury, O. B., Dzenitis, J. M., Felker, B., Frank, M., Liddick, S. N., Moran, M. J., Roberson, G. P., Weiss, P. B., Grim, G. P., Aragonez, R. J., Archuleta, T. N., Batha, S. H., Clark, D. D., Clark, D. J., Danly, C. R., Day, R. D., and Fatherley, V. E.

Subjects
NEUTRONS, IMAGING systems, INERTIAL confinement fusion, OPTICS
Abstract

We have fielded a neutron imaging system at the National Ignition Facility to collect images of fusion neutrons produced in the implosion of inertial confinement fusion experiments and scattered neutrons from (n, n') reactions of the source neutrons in the surrounding dense material. A description of the neutron imaging system is presented, including the pinhole array aperture, the line-of-sight collimation, the scintillator-based detection system and the alignment systems and methods. Discussion of the alignment and resolution of the system is presented. We also discuss future improvements to the system hardware. [ABSTRACT FROM AUTHOR]

Published
2013
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10. Comparing neutron and X-ray images from NIF implosions.

Author

Wilson, D. C., Aragonez, R. J., Archuleta, T. N., Atkinson, D. P., Barrios, M. A., Batha, S. H., Bower, D. E., Bradley, D. K., Buckles, R. A., Clark, D. D., Clark, D. S., Clark, D. J., Cradick, J. R., Danly, C. R., Day, R. D., Dzenitis, J. M., Drury, O. B., Fatherley, V. E., Felker, B., and Finch, J. P.

Subjects
LASERS, NEUTRONS, X-ray imaging, HYDROGEN, GERMANIUM
Abstract

Directly laser driven and X-radiation driven DT filled capsules differ in the relationship between neutron and X-ray images. Shot N110217, a directly driven DT-filled glass micro-balloon provided the first neutron images at the National Ignition Facility. As seen in implosions on the Omega laser, the neutron image can be enclosed inside time integrated X-ray images. HYDRA simulations show the X-ray image is dominated by emission from the hot glass shell while the neutron image arises from the DT fuel it encloses. In the absence of mix or jetting, X-ray images of a cryogenically layered THD fuel capsule should be dominated by emission from the hydrogen rather than the cooler plastic shell that is separated from the hot core by cold DT fuel. This cool, dense DT, invisible in X-ray emission, shows itself by scattering hot core neutrons. Germanium X-ray emission spectra and Ross pair filtered X-ray energy resolved images suggest that germanium doped plastic emits in the torus shaped hot spot, probably reducing the neutron yield. [ABSTRACT FROM AUTHOR]

Published
2013
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11. Alignment commissioning of the neutron imager for the national ignition facility

Author

Drury, O. B., primary, Bower, D. E., additional, Burkhart, S. C., additional, Dzenitis, J. M., additional, Felker, B., additional, Fittinghoff, D. N., additional, Frank, M., additional, Kalantar, D. H., additional, Klingmann, J. L., additional, Buckles, R. A., additional, Munson, C. P., additional, Esquibel, D., additional, Fatherley, V. E., additional, Grim, G. P., additional, Merrill, F. E., additional, Oertel, J. A., additional, and Wilde, C. H., additional

Published
2011
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12. Modeling the National Ignition Facility neutron imaging system

Author

Wilson, D. C., primary, Grim, G. P., additional, Tregillis, I. L., additional, Wilke, M. D., additional, Patel, M. V., additional, Sepke, S. M., additional, Morgan, G. L., additional, Hatarik, R., additional, Loomis, E. N., additional, Wilde, C. H., additional, Oertel, J. A., additional, Fatherley, V. E., additional, Clark, D. D., additional, Fittinghoff, D. N., additional, Bower, D. E., additional, Schmitt, M. J., additional, Marinak, M. M., additional, Munro, D. H., additional, Merrill, F. E., additional, Moran, M. J., additional, Wang, T.-S. F., additional, Danly, C. R., additional, Hilko, R. A., additional, Batha, S. H., additional, Frank, M., additional, and Buckles, R., additional

Published
2010
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13. ZR neutron diagnostic suite

Author

Leeper, R J, primary, Ruiz, C L, additional, Chandler, G A, additional, Cooper, G W, additional, Bower, D E, additional, Fittinghoff, D N, additional, Hagen, E C, additional, Hollaway, J R, additional, McKenna, I J, additional, McPherson, L A, additional, May, M J, additional, Meeham, B T, additional, Nelson, A J, additional, Perry, T S, additional, Porter, J L, additional, Robbins, L L, additional, Sinars, D B, additional, Torres, J A, additional, and Ziegler, L H, additional

Published
2008
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14. Laser coupling to reduced-scale hohlraum targets at the Early Light Program of the National Ignition Facility

Author

Hinkel, D. E., primary, Schneider, M. B., additional, Baldis, H. A., additional, Bonanno, G., additional, Bower, D. E., additional, Campbell, K. M., additional, Celeste, J. R., additional, Compton, S., additional, Costa, R., additional, Dewald, E. L., additional, Dixit, S. N., additional, Eckart, M. J., additional, Eder, D. C., additional, Edwards, M. J., additional, Ellis, A., additional, Emig, J. A., additional, Froula, D. H., additional, Glenzer, S. H., additional, Hargrove, D., additional, Haynam, C. A., additional, Heeter, R. F., additional, Henesian, M. A., additional, Holder, J. P., additional, Holtmeier, G., additional, James, L., additional, Jancaitis, K. S., additional, Kalantar, D. H., additional, Kamperschroer, J. H., additional, Kauffman, R. L., additional, Kimbrough, J., additional, Kirkwood, R. K., additional, Koniges, A. E., additional, Landen, O. L., additional, Landon, M., additional, Langdon, A. B., additional, Lee, F. D., additional, MacGowan, B. J., additional, Mackinnon, A. J., additional, Manes, K. R., additional, Marshall, C., additional, May, M. J., additional, McDonald, J. W., additional, Menapace, J., additional, Moses, E. I., additional, Munro, D. H., additional, Murray, J. R., additional, Niemann, C., additional, Pellinen, D., additional, Rekow, V., additional, Ruppe, J. A., additional, Schein, J., additional, Shepherd, R., additional, Singh, M. S., additional, Springer, P. T., additional, Still, C. H., additional, Suter, L. J., additional, Tietbohl, G. L., additional, Turner, R. E., additional, Van Wonterghem, B. M., additional, Wallace, R. J., additional, Warrick, A., additional, Watts, P., additional, Weber, F., additional, Wegner, P. J., additional, Williams, E. A., additional, Young, B. K., additional, and Young, P. E., additional

Published
2005
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15. Laser coupling to reduced-scale targets at NIF Early Light

Author

Hinkel, D. E., Schneider, M. B., Young, B. K., Holder, J. P., Langdon, A. B., Baldis, H. A., Bonanno, G., Bower, D. E., Bruns, H. C., Campbell, K. M., Celeste, J. R., Compton, S., Costa, R. L., Dewald, E. L., Dixit, S. N., Eckart, M. J., Eder, D. C., Edwards, M. J., Ellis, A. D., Emig, J. A., Froula, D. H., Glenzer, S. H., Hargrove, D., Haynam, C. A., Heeter, R. F., Henesian, M. A., Holtmeier, G., James, D. L., Jancaitis, K. S., Kalantar, D. H., Kamperschroer, J. H., Kauffman, R. L., Kimbrough, J., Kirkwood, R. K., Koniges, A. E., Landen, O. L., Landon, M., Lee, F. D., MacGowan, B. J., Mackinnon, A. J., Manes, K. R., Marshall, C., May, M. J., McDonald, J. W., Menapace, J., Moses, S. E.I., Munro, D. H., Murray, J. R., Niemann, C., Pellinen, D., Power, G. D., Rekow, V., Ruppe, J. A., Schein, J., Shepherd, R., Singh, M. S., Springer, P. T., Still, C. H., Suter, L. J., Tietbohl, G. L., Turner, R. E., VanWonterghem, B. M., Wallace, R. J., Warrick, A., Watts, P., Weber, F., Wegner, P. J., Williams, E. A., Young, P. E., Hinkel, D. E., Schneider, M. B., Young, B. K., Holder, J. P., Langdon, A. B., Baldis, H. A., Bonanno, G., Bower, D. E., Bruns, H. C., Campbell, K. M., Celeste, J. R., Compton, S., Costa, R. L., Dewald, E. L., Dixit, S. N., Eckart, M. J., Eder, D. C., Edwards, M. J., Ellis, A. D., Emig, J. A., Froula, D. H., Glenzer, S. H., Hargrove, D., Haynam, C. A., Heeter, R. F., Henesian, M. A., Holtmeier, G., James, D. L., Jancaitis, K. S., Kalantar, D. H., Kamperschroer, J. H., Kauffman, R. L., Kimbrough, J., Kirkwood, R. K., Koniges, A. E., Landen, O. L., Landon, M., Lee, F. D., MacGowan, B. J., Mackinnon, A. J., Manes, K. R., Marshall, C., May, M. J., McDonald, J. W., Menapace, J., Moses, S. E.I., Munro, D. H., Murray, J. R., Niemann, C., Pellinen, D., Power, G. D., Rekow, V., Ruppe, J. A., Schein, J., Shepherd, R., Singh, M. S., Springer, P. T., Still, C. H., Suter, L. J., Tietbohl, G. L., Turner, R. E., VanWonterghem, B. M., Wallace, R. J., Warrick, A., Watts, P., Weber, F., Wegner, P. J., Williams, E. A., and Young, P. E.

Abstract

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 temperature of 340 eV. In addition, the Raman backscatter spectrum contains features consistent with Brillouin backscatter of Raman forward scatter [A. B. Langdon and D. E. Hinkel, Physical Review Letters 89, 015003 (2002)]. Also, NIF Early Light diagnostics indicate that 20% of the direct backscatter from these reduced-scale targets is in the polarization orthogonal to that of the incident light.

Published
2006
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16. X-ray flux and X-ray burnthrough experiments on reduced-scale targets at the NIF and OMEGA lasers

Author

Schneider, M. B., Hinkel, D. E., Young, B. K., Holder, J. P., Langdon, A. B., Baldis, H. A., Bahr, R., Bower, D. E., Bruns, H. C., Campbell, K. M., Celeste, J. R., Compton, S., Constantin, C. G., Costa, R. L., Dewald, E. L., Dixit, S. N., Eckart, M. J., Eder, D. C., Edwards, M. J., Ellis, A. D., Emig, J. A., Froula, D. H., Glebov, V., Glenzer, S. H., Hargrove, D., Haynam, C. A., Heeter, R. F., Henesian, M. A., Holtmeier, G., James, D. L., Jancaitis, K. S., Kalantar, D. H., Kamperschroer, J. H., Kauffman, R. L., Kimbrough, J., Kirkwood, R., Koniges, A. E., Landen, O. L., Landon, M., Lee, F. D., MacGowan, B. J., Mackinnon, A. J., Manes, K. R., Marshall, C., May, M. J., McDonald, J. W., Menapace, J., Moon, S. J., Moses, E. I., Munro, D. H., Murray, J. R., Niemann, C., Pellinen, D., Piston, K., Power, G. D., Rekow, V., Roberts, S., Ruppe, J. A., Schein, J., Seka, W., Shepherd, R., Singh, M. S., Sorce, C., Springer, P. T., Still, C. H., Stoeckl, C., Suter, L. J., Tietbohl, G. L., Turner, R. E., Van Wonterghem, B. M., Wallace, R. J., Warrick, A., Watts, P., Weber, F., Wegner, P. J., Williams, E. A., Young, P. E., Schneider, M. B., Hinkel, D. E., Young, B. K., Holder, J. P., Langdon, A. B., Baldis, H. A., Bahr, R., Bower, D. E., Bruns, H. C., Campbell, K. M., Celeste, J. R., Compton, S., Constantin, C. G., Costa, R. L., Dewald, E. L., Dixit, S. N., Eckart, M. J., Eder, D. C., Edwards, M. J., Ellis, A. D., Emig, J. A., Froula, D. H., Glebov, V., Glenzer, S. H., Hargrove, D., Haynam, C. A., Heeter, R. F., Henesian, M. A., Holtmeier, G., James, D. L., Jancaitis, K. S., Kalantar, D. H., Kamperschroer, J. H., Kauffman, R. L., Kimbrough, J., Kirkwood, R., Koniges, A. E., Landen, O. L., Landon, M., Lee, F. D., MacGowan, B. J., Mackinnon, A. J., Manes, K. R., Marshall, C., May, M. J., McDonald, J. W., Menapace, J., Moon, S. J., Moses, E. I., Munro, D. H., Murray, J. R., Niemann, C., Pellinen, D., Piston, K., Power, G. D., Rekow, V., Roberts, S., Ruppe, J. A., Schein, J., Seka, W., Shepherd, R., Singh, M. S., Sorce, C., Springer, P. T., Still, C. H., Stoeckl, C., Suter, L. J., Tietbohl, G. L., Turner, R. E., Van Wonterghem, B. M., Wallace, R. J., Warrick, A., Watts, P., Weber, F., Wegner, P. J., Williams, E. A., and Young, P. E.

Abstract

An experimental campaign to maximize radiation drive in small-scale hohlraums has been carried out at the National Ignition Facility (NIF) at the Lawerence Livermore National Laboratory (Livermore, CA, USA) and at the OMEGA laser at the Laboratory for Laser Energetics (Rochester, NY, USA). The small-scale hohlraums, laser energy, laser pulse, and diagnostics were similar at both facilities but the geometries were very different. The NIF experiments used on-axis laser beams whereas the OMEGA experiments used 19 beams in three beam cones. In the cases when the lasers coupled well and produced similar radiation drive, images of x-ray burnthrough and laser deposition indicate the pattern of plasma filling is very different.

Published
2006
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17. Full aperture backscatter station measurement system on the National Ignition Facility.

Author

Bower, D. E., McCarville, T. J., Alvarez, S. S., Ault, L. E., Brown, M. D., Chrisp, M. P., Damian, C. M., DeHope, W. J., Froula, D. H., Glenzer, S. H., Grace, S. E., Gu, K., Holdener, F. R., Huffer, C. K., Kamperschroer, J. H., Kelleher, T. M., Kimbrough, J. R., Kirkwood, R., Kurita, D. W., and Lee, A. P.

Subjects
*MEASURING instruments, *BRILLOUIN scattering, *RAMAN effect, *SPECTROMETERS, *LIGHT scattering, *ELECTROMAGNETIC wave scattering
Abstract

A full aperture backscatter station (FABS) target diagnostic has been activated on the first four beams of the National Ignition Facility. FABS measures both stimulated Brillouin scattering and stimulated Raman scattering with a suite of measurement instruments. Digital cameras and spectrometers record spectrally resolved energy for both P and S polarized light. Streaked spectrometers measure the spectral and temporal behavior of the backscattered light. Calorimeters and fast photodetectors measure the integrated energy and temporal behavior of the light, respectively. This article provides an overview of the FABS measurement system and detailed descriptions of the diagnostic instruments and the optical path. [ABSTRACT FROM AUTHOR]

Published
2004
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18. Progress in long scale length laser-plasma interactions

Author

Glenzer, S. H., Arnold, P., Bardsley, G., Berger, R. L., Bonanno, G., Borger, T., Bower, D. E., Bowers, M., Bryant, R., Buckman, S., Burkhart, S. C., Campbell, K., Chrisp, M. P., Cohen, B. I., Constantin, C., Cooper, F., Cox, J., Dewald, E., Divol, L., Dixit, S., Duncan, J., Eder, D., Edwards, J., Erbert, G., Felker, B., Fornes, J., Frieders, G., Dustin Froula, Gardner, S. D., Gates, C., Gonzalez, M., Grace, S., Gregori, G., Greenwood, A., Griffith, R., Hall, T., Hammel, B. A., Haynam, C., Heestand, G., Henesian, M., Hermes, G., Hinkel, D., Holder, J., Holdner, F., Holtmeier, G., Hsing, W., Huber, S., James, T., Johnson, S., Jones, O. S., Kalantar, D., Kamperschroer, J. H., Kauffman, R., Kelleher, T., Knight, J., Kirkwood, R. K., Kruer, W. L., Labiak, W., Landen, O. L., Langdon, A. B., Langer, S., Latray, D., Lee, A., Lee, F. D., Lund, D., Macgowan, B., Marshall, S., Mcbride, J., Mccarville, T., Mcgrew, L., Mackinnon, A. J., Mahavandi, S., Manes, K., Marshall, C., Menapace, J., Mertens, E., Meezan, N., Miller, G., Montelongo, S., Moody, J. D., Moses, E., Munro, D., Murray, J., Neumann, J., Newton, M., Ng, E., Niemann, C., Nikitin, A., Opsahl, P., Padilla, E., Parham, T., Parrish, G., Petty, C., Polk, M., Powell, C., Reinbachs, I., Rekow, V., Rinnert, R., and Riordan, B.

Subjects
Physics::Plasma Physics
Abstract

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 (3ω) with a total intensity of 2×1015W cm-2. The targets were filled with 1 atm of CO2 producing of up to 7 mm long homogeneously heated plasmas with densities of ne = 6 × 1020cm-3 and temperatures of Te = 2 keV. The high energy in a NIF quad of beams of 16kJ, illuminating the target from one direction, creates unique conditions for the study of laser plasma interactions at scale lengths not previously accessible. The propagation through the large-scale plasma was measured with a gated x-ray imager that was filtered for 3.5 keVx rays. These data indicate that the beams interact with the full length of this ignition-scale plasma during the last ∼1 ns of the experiment. During that time, the full aperture measurements of the stimulated Brillouin scattering and stimulated Raman scattering show scattering into the four focusing lenses of 3% for the smallest length (∼2 mm), increasing to 10-12% for ∼7 mm. These results demonstrate the NIF experimental capabilities and further provide a benchmark for three-dimensional modeling of the laser-plasma interactions at ignition-size scale lengths.

19. Epizootic feline pneumonia associated with Centers for Disease Control group EF-4a bacteria.

Author

Weyant RS, Burris JA, Nichols DK, Woo E, Kinsey VS, Bower DE, Bukowski MM, Weaver RE, and Moore TD

Subjects
Animals, Bronchopneumonia microbiology, Cats, Centers for Disease Control and Prevention, U.S., Electrophoresis, Polyacrylamide Gel, Gram-Negative Bacteria isolation & purification, United States, Bronchopneumonia veterinary, Cat Diseases microbiology, Gram-Negative Bacterial Infections veterinary
Published
1994

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