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358 results on '"Herrmann, H. W."'

1. The impact of low-mode symmetry on inertial fusion energy output in the burning plasma state

Author

Ralph, J. E., Ross, J. S., Zylstra, A. B., Kritcher, A. L., Robey, H. F., Young, C. V., Hurricane, O. A., Pak, A., Callahan, D. A., Baker, K. L., Casey, D. T., Döppner, T., Divol, L., Hohenberger, M., Pape, S. Le, Patel, P. K., Tommasini, R., Ali, S. J., Amendt, P. A., Atherton, L. J., Bachmann, B., Bailey, D., Benedetti, L. R., Berzak Hopkins, L., Betti, R., Bhandarkar, S. D., Biener, J., Bionta, R. M., Birge, N. W., Bond, E. J., Bradley, D. K., Braun, T., Briggs, T. M., Bruhn, M. W., Celliers, P. M., Chang, B., Chapman, T., Chen, H., Choate, C., Christopherson, A. R., Clark, D. S., Crippen, J. W., Dewald, E. L., Dittrich, T. R., Edwards, M. J., Farmer, W. A., Field, J. E., Fittinghoff, D., Frenje, J., Gaffney, J., Gatu Johnson, M., Glenzer, S. H., Grim, G. P., Haan, S., Hahn, K. D., Hall, G. N., Hammel, B. A., Harte, J., Hartouni, E., Heebner, J. E., Hernandez, V. J., Herrmann, H. W., Herrmann, M. C., Hinkel, D. E., Ho, D. D., Holder, J. P., Hsing, W. W., Huang, H., Humbird, K. D., Izumi, N., Jarrott, L. C., Jeet, J., Jones, O., Kerbel, G. D., Kerr, S. M., Khan, S. F., Kilkenny, J., Kim, Y., Geppert-Kleinrath, H., Geppert-Kleinrath, V., Kong, C., Koning, J. M., Kroll, J. J., Kruse, M. K. G., Kustowski, B., Landen, O. L., Langer, S., Larson, D., Lemos, N. C., Lindl, J. D., Ma, T., MacDonald, M. J., MacGowan, B. J., Mackinnon, A. J., MacLaren, S. A., MacPhee, A. G., Marinak, M. M., Mariscal, D. A., Marley, E. V., Masse, L., Meaney, K. D., Meezan, N. B., Michel, P. A., Millot, M., Milovich, J. L., Moody, J. D., Moore, A. S., Morton, J. W., Murphy, T. J., Newman, K., Di Nicola, J.-M. G., Nikroo, A., Nora, R., Patel, M. V., Pelz, L. J., Peterson, J. L., Ping, Y., Pollock, B. B., Ratledge, M., Rice, N. G., Rinderknecht, H. G., Rosen, M., Rubery, M. S., Salmonson, J. D., Sater, J., Schiaffino, S., Schlossberg, D. J., Schneider, M. B., Schroeder, C. R., Scott, H. A., Sepke, S. M., Sequoia, K., Sherlock, M. W., Shin, S., Smalyuk, V. A., Spears, B. K., Springer, P. T., Stadermann, M., Stoupin, S., Strozzi, D. J., Suter, L. J., Thomas, C. A., Town, R. P. J., Trosseille, C., Tubman, E. R., Volegov, P. L., Weber, C. R., Widmann, K., Wild, C., Wilde, C. H., Van Wonterghem, B. M., Woods, D. T., Woodworth, B. N., Yamaguchi, M., Yang, S. T., and Zimmerman, G. B.

Published
2024
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2. Observation and modeling of interspecies ion separation in inertial confinement fusion implosions via imaging x-ray spectroscopy

Author

Joshi, T. R., Hakel, P., Hsu, S. C., Vold, E. L., Schmitt, M. J., Hoffman, N. M., Rauenzahn, R. M., Kagan, G., Tang, X. -Z., Mancini, R. C., Kim, Y., and Herrmann, H. W.

Subjects
Physics - Plasma Physics
Abstract

We report first direct experimental evidence of interspecies ion separation in direct-drive ICF experiments performed at the OMEGA laser facility via spectrally, temporally and spatially resolved imaging x-ray-spectroscopy data [S. C. Hsu et al., EPL 115, 65001 (2016)]. These experiments were designed based on the expectation that interspecies ion thermo-diffusion would be strongest for species with large mass and charge difference. The targets were spherical plastic shells filled with D2 and a trace amount of Ar (0.1% or 1% by atom). Ar K-shell spectral features were observed primarily between the time of first-shock convergence and slightly before neutron bang time, using a time- and space-integrated spectrometer, a streaked crystal spectrometer, and two gated multi-monochromatic x-ray imagers fielded along quasi-orthogonal lines of sight. Detailed spectroscopic analyses of spatially resolved Ar K-shell lines reveal deviation from the initial 1% Ar gas fill and show both Ar-concentration enhancement and depletion at different times and radial positions of the implosion. The experimental results are interpreted with radiation-hydrodynamic simulations that include recently implemented, first-principles models of interspecies ion diffusion. The experimentally inferred Ar-atom-fraction profiles agree reasonably with calculated profiles associated with the incoming and rebounding first shock., Comment: 13 pages, 11 figures, 1 table, submitted for publication (2017)

Published
2017
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3. Simulation and assessment of ion kinetic effects in a direct-drive capsule implosion experiment

Author

Le, Ari, Kwan, T. J. T., Schmitt, M. J., Herrmann, H. W., and Batha, S. H.

Subjects
Physics - Plasma Physics
Abstract

The first simulations employing a kinetic treatment of both fuel and shell ions to model inertial confinement fusion experiments are presented, including results showing the importance of kinetic physics processes in altering fusion burn. A pair of direct drive capsule implosions performed at the OMEGA facility with two different gas fills of deuterium, tritium, and helium-3 are analyzed. During implosion shock convergence, highly non-Maxwellian ion velocity distributions and separations in the density and temperature amongst the ion species are observed. Diffusion of fuel into the capsule shell is identified as a principal process that degrades fusion burn performance.

Published
2016
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4. Observation of interspecies ion separation in inertial-confinement-fusion implosions

Author

Hsu, S. C., Joshi, T. R., Hakel, P., Vold, E. L., Schmitt, M. J., Hoffman, N. M., Rauenzahn, R. M., Kagan, G., Tang, X. -Z., Mancini, R. C., Kim, Y., and Herrmann, H. W.

Subjects
Physics - Plasma Physics
Abstract

We report direct experimental evidence of interspecies ion separation in direct-drive, inertial-confinement-fusion experiments on the OMEGA laser facility. These experiments, which used plastic capsules with D$_2$/Ar gas fill (1% Ar by atom), were designed specifically to reveal interspecies ion separation by exploiting the predicted, strong ion thermo-diffusion between ion species of large mass and charge difference. Via detailed analyses of imaging x-ray-spectroscopy data, we extract Ar-atom-fraction radial profiles at different times, and observe both enhancement and depletion compared to the initial 1%-Ar gas fill. The experimental results are interpreted with radiation-hydrodynamic simulations that include recently implemented, first-principles models of interspecies ion diffusion. The experimentally inferred Ar-atom-fraction profiles agree reasonably, but not exactly, with calculated profiles associated with the incoming and rebounding first shock., Comment: 7 pages, 4 figures, 1 table; submitted for publication

Published
2016
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5. Measurements of fusion reaction history in inertially confined burning plasmas.

Author

Kim, Y., Meaney, K. D., Geppert-Kleinrath, H., Herrmann, H. W., Murphy, T. J., Young, C. S., Hoffman, N. M., Jorgenson, H. J., Morrow, T., Wilson, D. C., Loomis, E. N., Cerjan, C., Zylstra, A. B., Jeet, J., Schlossberg, D. J., Rubery, M. S., Moore, A. S., Kritcher, A. L., Carrera, J. A., and Mariscal, E. F.

Subjects
NUCLEAR fusion, CHERENKOV counters, PLASMA confinement, TRITIUM, GAS detectors, INERTIAL confinement fusion, DETECTORS
Abstract

Direct evidence of inertially confined fusion ignition appears in the abrupt temperature increase and consequent rapid increase in the thermonuclear burn rate as seen in the reaction history. The Gamma Reaction History (GRH) and Gas Cherenkov Detector (GCD) diagnostics are γ-based Cherenkov detectors that provide high quality measurements of deuterium–tritium fusion γ ray production and are, thus, capable of monitoring the thermonuclear burn rate. Temporal shifts in both peak burn time and burn width have been observed during recent high-yield shots (yields greater than 1017 neutrons) and are essential diagnostic signatures of the ignition process. While the current GRH and GCD detectors are fast enough to sense the changes of reaction history due to alpha heating, they do not have enough dynamic range to capture the onset of alpha heating. The next generation of instrumentation, GRH-15m, is proposed to increase the yield-rate coverage to measure the onset of alpha-heating. [ABSTRACT FROM AUTHOR]

Published
2023
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7. Fusion Product Measurements in D-T Plasmas in TFTR

Author

Johnson, L. C., Barnes, C. W., Bell, R. E., Bitter, M., Budny, R. V., Bush, C. E., Darrow, D. S., Duong, H. H., Efthimion, P. C., Fisher, R. K., Fonck, R. J., Herrmann, H. W., Jassby, D. L., Krasilnikov, A. V., McKee, G. R., Medley, S. S., Osakabe, M., Petrov, M. P., Roquemore, A. L., Sasao, M., Sesnic, S., Stratton, B. C., Synakowski, E. J., von Goeler, S., Zweben, S. J., Stott, Peter E., editor, Gorini, Giuseppe, editor, and Sindoni, Elio, editor

Published
1996
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9. T–T Neutron Spectrum from Inertial Confinement Implosions

Author

Bacher, A. D., Casey, D. T., Frenje, J. A., Gatu Johnson, M. J., Manuel, M., Sinenian, N., Zylstra, A. B., Séguin, F. H., Li, C. K., Petrasso, R. D., Glebov, V. Yu, Radha, P. B., Meyerhofer, D. D., Sangster, T. C., McNabb, D. P., Amendt, P. A., Boyd, R. N., Caggiano, J. A., Hatchett, S. P., Pino, J. E., Quaglioni, S., Rygg, J. R., Thompson, I. J., Herrmann, H. W., and Kim, Y. H.

Published
2013
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10. First spectral measurement of deuterium-tritium fusion γ rays in inertial fusion experiments

Author

Horsfield, C. J., primary, Rubery, M. S., additional, Mack, J. M., additional, Herrmann, H. W., additional, Kim, Y., additional, Young, C. S., additional, Caldwell, S. E., additional, Evans, S. C., additional, Sedillo, T. S., additional, McEvoy, A. M., additional, Hoffman, N. M., additional, Huff, M. A., additional, Langenbrunner, J. R., additional, Hale, G. M., additional, Wilson, D. C., additional, Stoeffl, W., additional, Church, J. A., additional, Grafil, E. M., additional, Miller, E. K., additional, and Glebov, V. Yu, additional

Published
2021
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13. Multi-pulse time resolved gamma ray spectroscopy of the advanced radiographic capability using gas Cherenkov diagnostics

Author

Meaney, K. D., primary, Kerr, S., additional, Williams, G. J., additional, Geppert-Kleinrath, H., additional, Kim, Y., additional, Herrmann, H. W., additional, Kalantar, D. H., additional, Mackinnon, A., additional, Bowers, M., additional, Pelz, L., additional, Alessi, D., additional, Martinez, D., additional, Prantil, M., additional, Herriot, S., additional, Hermann, M. R., additional, Lanier, T. E., additional, Hamamoto, M., additional, Di Nicola, J. M., additional, Yang, S., additional, Williams, W., additional, Widmayer, C., additional, and Lowe-Webb, R., additional

Published
2021
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14. First observation of increased DT yield over prediction due to addition of hydrogen

Author

Kim, Y., primary, Herrmann, H. W., additional, Hoffman, N. M., additional, Schmitt, M. J., additional, Kagan, G., additional, McEvoy, A. M., additional, Zylstra, A. B., additional, Smidt, J. M., additional, Gales, S., additional, Leatherland, A., additional, Rubery, M., additional, Gatu Johnson, M., additional, Frenje, J. A., additional, Yu Glebov, V., additional, and Forrest, C., additional

Published
2021
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17. H2(p,γ)He3 cross section measurement using high-energy-density plasmas

Author

Zylstra, A. B., primary, Herrmann, H. W., additional, Kim, Y. H., additional, McEvoy, A., additional, Frenje, J. A., additional, Johnson, M. Gatu, additional, Petrasso, R. D., additional, Glebov, V. Yu., additional, Forrest, C., additional, Delettrez, J., additional, Gales, S., additional, and Rubery, M., additional

Published
2020
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21. Progress on next generation gamma-ray Cherenkov detectors for the National Ignition Facility

Author

Herrmann, H. W., primary, Kim, Y. H., additional, Zylstra, A. B., additional, Geppert-Kleinrath, H., additional, Meaney, K. D., additional, Young, C. S., additional, Lopez, F. E., additional, Fatherley, V. E., additional, Pederson, B. J., additional, Oertel, J. A., additional, Hernandez, J. E., additional, Carrera, J., additional, Khater, H., additional, Rubery, M. S., additional, Horsfield, C. J., additional, Gales, S., additional, Leatherland, A., additional, Hilsabeck, T., additional, Kilkenny, J. D., additional, Malone, R. M., additional, and Batha, S. H., additional

Published
2018
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24. Pulse dilation gas Cherenkov detector for ultra-fast gamma reaction history at the NIF (invited)

Author

Geppert-Kleinrath, H., primary, Herrmann, H. W., additional, Kim, Y. H., additional, Zylstra, A. B., additional, Meaney, K., additional, Lopez, F. E., additional, Pederson, B. J., additional, Carrera, J., additional, Khater, H., additional, Horsfield, C. J., additional, Rubery, M. S., additional, Gales, S., additional, Leatherland, A., additional, Meadowcroft, A., additional, Hilsabeck, T., additional, Kilkenny, J. D., additional, Malone, R. M., additional, Hares, J. D., additional, Dymoke-Bradshaw, A. K. L., additional, Milnes, J., additional, and McFee, C., additional

Published
2018
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25. Characterization of the Mercury pulsed power x-ray source spectrum using multichannel density aerogel Cherenkov detectors

Author

Meaney, K. D., primary, Kim, Y., additional, Herrmann, H. W., additional, Young, C. Y., additional, Archuleta, T. A., additional, Hamilton, C. E., additional, Duke, D. L., additional, Haines, T. J., additional, Corredor, A. C., additional, Green, J. A., additional, Fegenbush, L., additional, Kaufman, M. I., additional, Malone, R. M., additional, Baker, S. A., additional, Richardson, S., additional, Zier, J., additional, Engelbrecht, J., additional, and Culver, A., additional

Published
2018
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26. Experimental Evidence of a Variant Neutron Spectrum from the T(t,2n)α Reaction at Center-of-Mass Energies in the Range of 16–50 keV

Author

Gatu Johnson, M., primary, Forrest, C. J., additional, Sayre, D. B., additional, Bacher, A., additional, Bourgade, J.-L., additional, Brune, C. R., additional, Caggiano, J. A., additional, Casey, D. T., additional, Frenje, J. A., additional, Glebov, V. Yu., additional, Hale, G. M., additional, Hatarik, R., additional, Herrmann, H. W., additional, Janezic, R., additional, Kim, Y. H., additional, Knauer, J. P., additional, Landoas, O., additional, McNabb, D. P., additional, Paris, M. W., additional, Petrasso, R. D., additional, Pino, J. E., additional, Quaglioni, S., additional, Rosse, B., additional, Sanchez, J., additional, Sangster, T. C., additional, Sio, H., additional, Shmayda, W., additional, Stoeckl, C., additional, Thompson, I., additional, and Zylstra, A. B., additional

Published
2018
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27. Diffusion-dominated mixing in moderate convergence implosions

Author

Zylstra, A. B., primary, Hoffman, N. M., additional, Herrmann, H. W., additional, Schmitt, M. J., additional, Kim, Y. H., additional, Meaney, K., additional, Leatherland, A., additional, Gales, S., additional, Forrest, C., additional, Glebov, V. Yu., additional, Schoff, M., additional, Hoppe, M., additional, and Ravelo, N., additional

Published
2018
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28. Characterisation of a sub-20 ps temporal resolution pulse dilation photomultiplier tube

Author

Gales, S. G., primary, Horsfield, C. J., additional, Meadowcroft, A. L., additional, Leatherland, A. E., additional, Herrmann, H. W., additional, Hares, J. D., additional, Dymoke-Bradshaw, A. K. L., additional, Milnes, J. S., additional, Kim, Y. H., additional, Kleinrath, H. G., additional, Meaney, K., additional, Zylstra, A. B., additional, Parker, S., additional, Hussey, D., additional, Wilson, L., additional, James, S. F., additional, Kilkenny, J. D., additional, and Hilsabeck, T. J., additional

Published
2018
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29. A near one-dimensional indirectly driven implosion at convergence ratio 30

Author

MacLaren, S. A., primary, Masse, L. P., additional, Czajka, C. E., additional, Khan, S. F., additional, Kyrala, G. A., additional, Ma, T., additional, Ralph, J. E., additional, Salmonson, J. D., additional, Bachmann, B., additional, Benedetti, L. R., additional, Bhandarkar, S. D., additional, Bradley, P. A., additional, Hatarik, R., additional, Herrmann, H. W., additional, Mariscal, D. A., additional, Millot, M., additional, Patel, P. K., additional, Pino, J. E., additional, Ratledge, M., additional, Rice, N. G., additional, Tipton, R. E., additional, Tommasini, R., additional, and Yeamans, C. B., additional

Published
2018
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30. Variable convergence liquid layer implosions on the National Ignition Facility

Author

Zylstra, A. B., primary, Yi, S. A., additional, Haines, B. M., additional, Olson, R. E., additional, Leeper, R. J., additional, Braun, T., additional, Biener, J., additional, Kline, J. L., additional, Batha, S. H., additional, Berzak Hopkins, L., additional, Bhandarkar, S., additional, Bradley, P. A., additional, Crippen, J., additional, Farrell, M., additional, Fittinghoff, D., additional, Herrmann, H. W., additional, Huang, H., additional, Khan, S., additional, Kong, C., additional, Kozioziemski, B. J., additional, Kyrala, G. A., additional, Ma, T., additional, Meezan, N. B., additional, Merrill, F., additional, Nikroo, A., additional, Peterson, R. R., additional, Rice, N., additional, Sater, J. D., additional, Shah, R. C., additional, Stadermann, M., additional, Volegov, P., additional, Walters, C., additional, and Wilson, D. C., additional

Published
2018
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31. Optimization of a high-yield, low-areal-density fusion product source at the National Ignition Facility with applications in nucleosynthesis experiments

Author

Gatu Johnson, M., primary, Casey, D. T., additional, Hohenberger, M., additional, Zylstra, A. B., additional, Bacher, A., additional, Brune, C. R., additional, Bionta, R. M., additional, Craxton, R. S., additional, Ellison, C. L., additional, Farrell, M., additional, Frenje, J. A., additional, Garbett, W., additional, Garcia, E. M., additional, Grim, G. P., additional, Hartouni, E., additional, Hatarik, R., additional, Herrmann, H. W., additional, Hohensee, M., additional, Holunga, D. M., additional, Hoppe, M., additional, Jackson, M., additional, Kabadi, N., additional, Khan, S. F., additional, Kilkenny, J. D., additional, Kohut, T. R., additional, Lahmann, B., additional, Le, H. P., additional, Li, C. K., additional, Masse, L., additional, McKenty, P. W., additional, McNabb, D. P., additional, Nikroo, A., additional, Parham, T. G., additional, Parker, C. E., additional, Petrasso, R. D., additional, Pino, J., additional, Remington, B., additional, Rice, N. G., additional, Rinderknecht, H. G., additional, Rosenberg, M. J., additional, Sanchez, J., additional, Sayre, D. B., additional, Schoff, M. E., additional, Shuldberg, C. M., additional, Séguin, F. H., additional, Sio, H., additional, Walters, Z. B., additional, and Whitley, H. D., additional

Published
2018
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32. Gas breakdown in an atmospheric pressure radio-frequency capacitive plasma source.

Author

Park, Jaeyoung, Henins, I., Herrmann, H. W., and Selwyn, G. S.

Subjects
ATMOSPHERIC pressure, PLASMA gases
Abstract

Gas breakdown is studied in an atmospheric pressure rf capacitive plasma source developed for materials applications. At a rf frequency of 13.56 MHz, breakdown voltage is largely a function of the product of the pressure and the discharge gap spacing, approximating the Paschen curve. However, breakdown voltage varies substantially with rf frequency due to a change in the electron loss mechanism. A large increase in breakdown voltage is observed when argon, oxygen, or nitrogen is added to helium despite their lower ionization potential. Discussion is given for optimal breakdown conditions at atmospheric pressure. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001
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33. Discharge phenomena of an atmospheric pressure radio-frequency capacitive plasma source.

Author

Park, Jaeyoung, Henins, I., Herrmann, H. W., Selwyn, G. S., and Hicks, R. F.

Subjects
ATMOSPHERIC pressure, PLASMA gases
Abstract

Discharge phenomena of a nonthermal atmospheric pressure plasma source have been studied. An atmospheric pressure plasma jet (APPJ) operates using rf power and produces a stable homogeneous discharge at atmospheric pressure. After breakdown, the APPJ operation is divided into two regimes, a "normal" operating mode when the discharge is stable and homogeneous, and a "failure" mode when the discharge converts into a filamentary arc. Current and voltage (I-V) characteristics and spatially resolved emission intensity profiles have been measured during the normal operating mode. These measurements show that the APPJ produces an alpha (α) mode rf capacitive discharge. Based upon a dimensional analysis using the observed I-V characteristics, a rough estimate is made for plasma density of 3x10[sup 11] cm[sup -3] and an electron temperature of 2 eV. In addition, the gas temperature of 120 °C has been spectroscopically measured inside the discharge. These plasma parameters indicate that the APPJ shows promise for various materials applications as it can produce substantial amounts of reactive species and avoid thermal damages, while having the advantage of atmospheric pressure operation. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2001
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36. The role of hot spot mix in the low-foot and high-foot implosions on the NIF

Author

Ma, T., primary, Patel, P. K., additional, Izumi, N., additional, Springer, P. T., additional, Key, M. H., additional, Atherton, L. J., additional, Barrios, M. A., additional, Benedetti, L. R., additional, Bionta, R., additional, Bond, E., additional, Bradley, D. K., additional, Caggiano, J., additional, Callahan, D. A., additional, Casey, D. T., additional, Celliers, P. M., additional, Cerjan, C. J., additional, Church, J. A., additional, Clark, D. S., additional, Dewald, E. L., additional, Dittrich, T. R., additional, Dixit, S. N., additional, Döppner, T., additional, Dylla-Spears, R., additional, Edgell, D. H., additional, Epstein, R., additional, Field, J., additional, Fittinghoff, D. N., additional, Frenje, J. A., additional, Gatu Johnson, M., additional, Glenn, S., additional, Glenzer, S. H., additional, Grim, G., additional, Guler, N., additional, Haan, S. W., additional, Hammel, B. A., additional, Hatarik, R., additional, Herrmann, H. W., additional, Hicks, D., additional, Hinkel, D. E., additional, Berzak Hopkins, L. F., additional, Hsing, W. W., additional, Hurricane, O. A., additional, Jones, O. S., additional, Kauffman, R., additional, Khan, S. F., additional, Kilkenny, J. D., additional, Kline, J. L., additional, Kozioziemski, B., additional, Kritcher, A., additional, Kyrala, G. A., additional, Landen, O. L., additional, Lindl, J. D., additional, Le Pape, S., additional, MacGowan, B. J., additional, Mackinnon, A. J., additional, MacPhee, A. G., additional, Meezan, N. B., additional, Merrill, F. E., additional, Moody, J. D., additional, Moses, E. I., additional, Nagel, S. R., additional, Nikroo, A., additional, Pak, A., additional, Parham, T., additional, Park, H.-S., additional, Ralph, J. E., additional, Regan, S. P., additional, Remington, B. A., additional, Robey, H. F., additional, Rosen, M. D., additional, Rygg, J. R., additional, Ross, J. S., additional, Salmonson, J. D., additional, Sater, J., additional, Sayre, D., additional, Schneider, M. B., additional, Shaughnessy, D., additional, Sio, H., additional, Spears, B. K., additional, Smalyuk, V., additional, Suter, L. J., additional, Tommasini, R., additional, Town, R. P. J., additional, Volegov, P. L., additional, Wan, A., additional, Weber, S. V., additional, Widmann, K., additional, Wilde, C. H., additional, Yeamans, C., additional, and Edwards, M. J., additional

Published
2017
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38. Development of an inertial confinement fusion platform to study charged-particle-producing nuclear reactions relevant to nuclear astrophysics

Author

Gatu Johnson, M., primary, Zylstra, A. B., additional, Bacher, A., additional, Brune, C. R., additional, Casey, D. T., additional, Forrest, C., additional, Herrmann, H. W., additional, Hohenberger, M., additional, Sayre, D. B., additional, Bionta, R. M., additional, Bourgade, J.-L., additional, Caggiano, J. A., additional, Cerjan, C., additional, Craxton, R. S., additional, Dearborn, D., additional, Farrell, M., additional, Frenje, J. A., additional, Garcia, E. M., additional, Glebov, V. Yu., additional, Hale, G., additional, Hartouni, E. P., additional, Hatarik, R., additional, Hohensee, M., additional, Holunga, D. M., additional, Hoppe, M., additional, Janezic, R., additional, Khan, S. F., additional, Kilkenny, J. D., additional, Kim, Y. H., additional, Knauer, J. P., additional, Kohut, T. R., additional, Lahmann, B., additional, Landoas, O., additional, Li, C. K., additional, Marshall, F. J., additional, Masse, L., additional, McEvoy, A., additional, McKenty, P., additional, McNabb, D. P., additional, Nikroo, A., additional, Parham, T. G., additional, Paris, M., additional, Petrasso, R. D., additional, Pino, J., additional, Radha, P. B., additional, Remington, B., additional, Rinderknecht, H. G., additional, Robey, H., additional, Rosenberg, M. J., additional, Rosse, B., additional, Rubery, M., additional, Sangster, T. C., additional, Sanchez, J., additional, Schmitt, M., additional, Schoff, M., additional, Séguin, F. H., additional, Seka, W., additional, Sio, H., additional, Stoeckl, C., additional, and Tipton, R. E., additional

Published
2017
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40. First Liquid Layer Inertial Confinement Fusion Implosions at the National Ignition Facility

Author

Olson, R. E., primary, Leeper, R. J., additional, Kline, J. L., additional, Zylstra, A. B., additional, Yi, S. A., additional, Biener, J., additional, Braun, T., additional, Kozioziemski, B. J., additional, Sater, J. D., additional, Bradley, P. A., additional, Peterson, R. R., additional, Haines, B. M., additional, Yin, L., additional, Berzak Hopkins, L. F., additional, Meezan, N. B., additional, Walters, C., additional, Biener, M. M., additional, Kong, C., additional, Crippen, J. W., additional, Kyrala, G. A., additional, Shah, R. C., additional, Herrmann, H. W., additional, Wilson, D. C., additional, Hamza, A. V., additional, Nikroo, A., additional, and Batha, S. H., additional

Published
2016
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41. Improved inertial confinement fusion gamma reaction history 12C gamma-ray signal by direct subtraction.

Author

Meaney, K. D., Kim, Y. H., Herrmann, H. W., Geppert-Kleinrath, H., and Hoffman, N. M.

Subjects
NUCLEAR fusion, CHERENKOV radiation, GAMMA rays, INERTIAL confinement fusion, NEUTRON scattering
Abstract

The Gamma Reaction History (GRH) diagnostic located at the National Ignition Facility (NIF) measures time resolved gamma rays released from inertial confinement fusion experiments by converting the emitted gamma rays into Cherenkov light. Imploded capsules have a bright 4.4 MeV gamma ray from fusion neutrons inelastically scattering with carbon atoms in the remaining ablator. The strength of the 4.4 MeV gamma ray line is proportional to the capsule's carbon ablator areal density and can be used to understand the dynamics and energy budget of a carbon-based ablator capsule implosion. Historically, the GRH's four gas cells use the energy thresholding from the Cherenkov process to forward fit an estimation of the experiment's complete gamma ray spectrum by modeling the surrounding environment in order to estimate the 4.4 MeV neutron induced carbon gamma ray signal. However, the high number of variables, local minima, and uncertainties in detector sensitivities and relative timing had prevented the routine use of the forward fit to generate carbon areal density measurements. A new, more straightforward process of direct subtraction of deconvolved signals was developed to simplify the extraction of the carbon areal density. Beryllium capsules are used as a calibration to measure the capsule environment with no carbon signal. The proposed method is then used to appropriately subtract and isolate the carbon signal on shots with carbon ablators. The subtraction algorithm achieves good results across all major capsule campaigns, achieving similar results to the forward fit. This method is now routinely used to measure carbon areal density for NIF shots. [ABSTRACT FROM AUTHOR]

Published
2019
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42. T–T Neutron Spectrum from Inertial Confinement Implosions

Author

Massachusetts Institute of Technology. Plasma Science and Fusion Center, Casey, Daniel Thomas, Frenje, Johan A, Gatu Johnson, Maria, Manuel, Mario J.-E, Sinenian, Nareg, Zylstra, Alex Bennett, Seguin, Fredrick Hampton, Li, Chikang, Quaglioni, S., Bacher, A. D., Petrasso, R. D., Glebov, V. Yu, Radha, P. B., Meyerhofer, D. D., Sangster, T. C., McNabb, D. P., Amendt, P. A., Boyd, R. N., Caggiano, J. A., Hatchett, S. P., Pino, J. E., Rygg, J. R., Thompson, I. J., Herrmann, H. W., Kim, Y. H., Massachusetts Institute of Technology. Plasma Science and Fusion Center, Casey, Daniel Thomas, Frenje, Johan A, Gatu Johnson, Maria, Manuel, Mario J.-E, Sinenian, Nareg, Zylstra, Alex Bennett, Seguin, Fredrick Hampton, Li, Chikang, Quaglioni, S., Bacher, A. D., Petrasso, R. D., Glebov, V. Yu, Radha, P. B., Meyerhofer, D. D., Sangster, T. C., McNabb, D. P., Amendt, P. A., Boyd, R. N., Caggiano, J. A., Hatchett, S. P., Pino, J. E., Rygg, J. R., Thompson, I. J., Herrmann, H. W., and Kim, Y. H.

Abstract

A new technique that uses inertial confinement implosions for measuring low-energy nuclear reactions important to nuclear astrophysics is described. Simultaneous measurements of n–D and n–T elastic scattering at 14.1 MeV using deuterium–tritium gas-filled capsules provide a proof of principle for this technique. Measurements have been made of D(d,p)T (dd) and T(t,2n)[superscript 4]He (tt) reaction yields relative to the D(t,n)[superscript]He (dt) reaction yield for deuterium–tritium mixtures with fT/fD between 0.62 and 0.75 and for a wide range of ion temperatures to test our understanding of the implosion processes. Measurements of the shape of the neutron spectrum from the T(t,2n)[superscript 4]He reaction have been made for each of these target configurations., National Laser User’s Facility (Grant NA0000877), United States. Dept. of Energy (Grant DE-FG52-09NA29553), University of Rochester. Fusion Science Center (Rochester Subaward 415023-G, UR Account 5-24431), University of Rochester. Laboratory for Laser Energetics (Grant 412160-001G), Lawrence Livermore National Laboratory (Grants B580243 and DE-AC52-07NA27344)

Published
2016

43. Next generation gamma-ray Cherenkov detectors for the National Ignition Facility

Author

Herrmann, H. W., primary, Kim, Y. H., additional, McEvoy, A. M., additional, Zylstra, A. B., additional, Young, C. S., additional, Lopez, F. E., additional, Griego, J. R., additional, Fatherley, V. E., additional, Oertel, J. A., additional, Stoeffl, W., additional, Khater, H., additional, Hernandez, J. E., additional, Carpenter, A., additional, Rubery, M. S., additional, Horsfield, C. J., additional, Gales, S., additional, Leatherland, A., additional, Hilsabeck, T., additional, Kilkenny, J. D., additional, Malone, R. M., additional, Hares, J. D., additional, Milnes, J., additional, Shmayda, W. T., additional, Stoeckl, C., additional, and Batha, S. H., additional

Published
2016
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49. Using Inertial Fusion Implosions to Measure theT+He3Fusion Cross Section at Nucleosynthesis-Relevant Energies

Author

Zylstra, A. B., primary, Herrmann, H. W., additional, Johnson, M. Gatu, additional, Kim, Y. H., additional, Frenje, J. A., additional, Hale, G., additional, Li, C. K., additional, Rubery, M., additional, Paris, M., additional, Bacher, A., additional, Brune, C. R., additional, Forrest, C., additional, Glebov, V. Yu., additional, Janezic, R., additional, McNabb, D., additional, Nikroo, A., additional, Pino, J., additional, Sangster, T. C., additional, Séguin, F. H., additional, Seka, W., additional, Sio, H., additional, Stoeckl, C., additional, and Petrasso, R. D., additional

Published
2016
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