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Your search keyword '"Speas, C. S."' showing total 31 results
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31 results on '"Speas, C. S."'

1. Controlling morphology and improving reproducibility of magnetized liner inertial fusion experiments

Author

Ampleford, D. J., primary, Yager-Elorriaga, D. A., additional, Jennings, C. A., additional, Harding, E. C., additional, Gomez, M. R., additional, Harvey-Thompson, A. J., additional, Awe, T. J., additional, Chandler, G. A., additional, Dunham, G. S., additional, Geissel, M., additional, Hahn, K. D., additional, Hansen, S. B., additional, Knapp, P. F., additional, Lamppa, D. C., additional, Lewis, W. E., additional, Lucero, L., additional, Mangan, M., additional, Paguio, R., additional, Perea, L., additional, Robertson, G. A., additional, Ruiz, C. L., additional, Ruiz, D. E., additional, Schmit, P. F., additional, Slutz, S. A., additional, Smith, G. E., additional, Smith, I. C., additional, Speas, C. S., additional, Webb, T. J., additional, Weis, M. R., additional, Whittemore, K., additional, Yu, E. P., additional, McBride, R. D., additional, Peterson, K. J., additional, Jones, B. M., additional, Rochau, G. A., additional, and Sinars, D. B., additional

Published
2024
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3. Demonstration of improved laser preheat with a cryogenically cooled magnetized liner inertial fusion platform

Author

Harvey-Thompson, A. J., primary, Geissel, M., additional, Crabtree, J. A., additional, Weis, M. R., additional, Gomez, M. R., additional, Fein, J. R., additional, Lewis, W. E., additional, Ampleford, D. J., additional, Awe, T. J., additional, Chandler, G. A., additional, Galloway, B. R., additional, Hansen, S. B., additional, Hanson, J., additional, Harding, E. C., additional, Jennings, C. A., additional, Kimmel, M., additional, Knapp, P. F., additional, Mangan, M. A., additional, Maurer, A., additional, Paguio, R. R., additional, Perea, L., additional, Peterson, K. J., additional, Porter, J. L., additional, Rambo, P. K., additional, Robertson, G. K., additional, Rochau, G. A., additional, Ruiz, D. E., additional, Shores, J. E., additional, Slutz, S. A., additional, Smith, G. E., additional, Smith, I. C., additional, Speas, C. S., additional, Yager-Elorriaga, D. A., additional, and York, A., additional

Published
2023
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4. Magnetic field effects on laser energy deposition and filamentation in magneto-inertial fusion relevant plasmas

Author

Lewis, S. M., primary, Weis, M. R., additional, Speas, C. S., additional, Kimmel, M., additional, Bengtson, R. D., additional, Breizman, B., additional, Geissel, M., additional, Gomez, M. R., additional, Harvey-Thompson, A. J., additional, Kellogg, J., additional, Long, J., additional, Looker, Q., additional, Quevedo, H. J., additional, Rambo, P., additional, Riley, N. R., additional, Schwarz, J., additional, Shores, J., additional, Stahoviak, J., additional, Struve, K., additional, Ampleford, D. J., additional, Porter, J. L., additional, and Ditmire, T., additional

Published
2021
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5. Lasergate: A windowless gas target for enhanced laser preheat in magnetized liner inertial fusion

Author

Galloway, B. R., primary, Slutz, S. A., additional, Kimmel, M. W., additional, Rambo, P. K., additional, Schwarz, J., additional, Geissel, M., additional, Harvey-Thompson, A. J., additional, Weis, M. R., additional, Jennings, C. A., additional, Field, E. S., additional, Kletecka, D. E., additional, Looker, Q., additional, Colombo, A. P., additional, Edens, A. D., additional, Smith, I. C., additional, Shores, J. E., additional, Speas, C. S., additional, Speas, R. J., additional, Spann, A. P., additional, Sin, J., additional, Gautier, S., additional, Sauget, V., additional, Treadwell, P. A., additional, Rochau, G. A., additional, and Porter, J. L., additional

Published
2021
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6. Increased preheat energy to MagLIF targets with cryogenic cooling

Author

Harvey-Thompson, A. J., primary, Geissel, M., additional, Crabtree, J. A., additional, Weis, M. R., additional, Gomez, M. R., additional, Fein, J. R., additional, Ampleford, D. J., additional, Awe, T. J., additional, Chandler, G. A., additional, Galloway, B. R., additional, Hansen, S. B., additional, Hanson, J., additional, Harding, E. C., additional, Jennings, C. A., additional, Kimmel, M., additional, Knapp, P. F., additional, Lamppa, D. C., additional, Lewis, W. E., additional, Mangan, M. A., additional, Maurer, A., additional, Perea, L., additional, Peterson, K. J., additional, Porter, J. L., additional, Rambo, P. K., additional, Robertson, G. K., additional, Rochau, G. A., additional, Ruiz, D. E., additional, Shores, J. E., additional, Slutz, S. A., additional, Smith, I. C., additional, Speas, C. S., additional, Yager-Elorriaga, D. A., additional, York, A., additional, Paguio, R. R., additional, and Smith, G. E., additional

Published
2021
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7. Review of pulsed power-driven high energy density physics research on Z at Sandia

Author

Sinars, D. B., primary, Sweeney, M. A., additional, Alexander, C. S., additional, Ampleford, D. J., additional, Ao, T., additional, Apruzese, J. P., additional, Aragon, C., additional, Armstrong, D. J., additional, Austin, K. N., additional, Awe, T. J., additional, Baczewski, A. D., additional, Bailey, J. E., additional, Baker, K. L., additional, Ball, C. R., additional, Barclay, H. T., additional, Beatty, S., additional, Beckwith, K., additional, Bell, K. S., additional, Benage, J. F., additional, Bennett, N. L., additional, Blaha, K., additional, Bliss, D. E., additional, Boerner, J. J., additional, Bourdon, C. J., additional, Branch, B. A., additional, Brown, J. L., additional, Campbell, E. M., additional, Campbell, R. B., additional, Chacon, D. G., additional, Chandler, G. A., additional, Chandler, K., additional, Christenson, P. J., additional, Christison, M. D., additional, Christner, E. B., additional, Clay, R. C., additional, Cochrane, K. R., additional, Colombo, A. P., additional, Cook, B. M., additional, Coverdale, C. A., additional, Cuneo, M. E., additional, Custer, J. S., additional, Dasgupta, A., additional, Davis, J.-P., additional, Desjarlais, M. P., additional, Dolan, D. H., additional, Douglass, J. D., additional, Dunham, G. S., additional, Duwal, S., additional, Edens, A. D., additional, Edwards, M. J., additional, Evstatiev, E. G., additional, Farfan, B. G., additional, Fein, J. R., additional, Field, E. S., additional, Fisher, J. A., additional, Flanagan, T. M., additional, Flicker, D. G., additional, Furnish, M. D., additional, Galloway, B. R., additional, Gard, P. D., additional, Gardiner, T. A., additional, Geissel, M., additional, Giuliani, J. L., additional, Glinsky, M. E., additional, Gomez, M. R., additional, Gomez, T., additional, Grim, G. P., additional, Hahn, K. D., additional, Haill, T. A., additional, Hamlin, N. D., additional, Hammer, J. H., additional, Hansen, S. B., additional, Hanshaw, H. L., additional, Harding, E. C., additional, Harvey-Thompson, A. J., additional, Headley, D., additional, Herrmann, M. C., additional, Hess, M. H., additional, Highstrete, C., additional, Hurricane, O. A., additional, Hutsel, B. T., additional, Jennings, C. A., additional, Johns, O. M., additional, Johnson, D., additional, Johnston, M. D., additional, Jones, B. M., additional, Jones, M. C., additional, Jones, P. A., additional, Kalita, P. E., additional, Kamm, R. J., additional, Kellogg, J. W., additional, Kiefer, M. L., additional, Kimmel, M. W., additional, Knapp, P. F., additional, Knudson, M. D., additional, Kreft, A., additional, Laity, G. R., additional, Lake, P. W., additional, Lamppa, D. C., additional, Langston, W. L., additional, Lash, J. S., additional, LeChien, K. R., additional, Leckbee, J. J., additional, Leeper, R. J., additional, Leifeste, G. T., additional, Lemke, R. W., additional, Lewis, W., additional, Lewis, S. A., additional, Loisel, G. P., additional, Looker, Q. M., additional, Lopez, A. J., additional, Lucero, D. J., additional, MacLaren, S. A., additional, Magyar, R. J., additional, Mangan, M. A., additional, Martin, M. R., additional, Mattsson, T. R., additional, Matzen, M. K., additional, Maurer, A. J., additional, Mazarakis, M. G., additional, McBride, R. D., additional, McLean, H. S., additional, McCoy, C. A., additional, McKee, G. R., additional, McKenney, J. L., additional, Miles, A. R., additional, Mills, J. A., additional, Mitchell, M. D., additional, Moore, N. W., additional, Myers, C. E., additional, Nagayama, T., additional, Natoni, G., additional, Owen, A. C., additional, Patel, S., additional, Peterson, K. J., additional, Pointon, T. D., additional, Porter, J. L., additional, Porwitzky, A. J., additional, Radovich, S., additional, Raman, K. S., additional, Rambo, P. K., additional, Reinhart, W. D., additional, Robertson, G. K., additional, Rochau, G. A., additional, Root, S., additional, Rose, D. V., additional, Rovang, D. C., additional, Ruiz, C. L., additional, Ruiz, D. E., additional, Sandoval, D., additional, Savage, M. E., additional, Sceiford, M. E., additional, Schaeuble, M. A., additional, Schmit, P. F., additional, Schollmeier, M. S., additional, Schwarz, J., additional, Seagle, C. T., additional, Sefkow, A. B., additional, Seidel, D. B., additional, Shipley, G. A., additional, Shores, J., additional, Shulenburger, L., additional, Simpson, S. C., additional, Slutz, S. A., additional, Smith, I. C., additional, Speas, C. S., additional, Specht, P. E., additional, Speir, M. J., additional, Spencer, D. C., additional, Springer, P. T., additional, Steiner, A. M., additional, Stoltzfus, B. S., additional, Stygar, W. A., additional, Ward Thornhill, J., additional, Torres, J. A., additional, Townsend, J. P., additional, Tyler, C., additional, Vesey, R. A., additional, Wakeland, P. E., additional, Webb, T. J., additional, Weinbrecht, E. A., additional, Weis, M. R., additional, Welch, D. R., additional, Wise, J. L., additional, Wu, M., additional, Yager-Elorriaga, D. A., additional, Yu, A., additional, and Yu, E. P., additional

Published
2020
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10. Constraining preheat energy deposition in MagLIF experiments with multi-frame shadowgraphy

Author

Harvey-Thompson, A. J., primary, Geissel, M., additional, Jennings, C. A., additional, Weis, M. R., additional, Gomez, M. R., additional, Fein, J. R., additional, Ampleford, D. J., additional, Chandler, G. A., additional, Glinsky, M. E., additional, Hahn, K. D., additional, Hansen, S. B., additional, Harding, E. C., additional, Knapp, P. F., additional, Paguio, R. R., additional, Perea, L., additional, Peterson, K. J., additional, Porter, J. L., additional, Rambo, P. K., additional, Robertson, G. K., additional, Rochau, G. A., additional, Ruiz, C. L., additional, Schwarz, J., additional, Shores, J. E., additional, Sinars, D. B., additional, Slutz, S. A., additional, Smith, G. E., additional, Smith, I. C., additional, Speas, C. S., additional, Whittemore, K., additional, and Woodbury, D., additional

Published
2019
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11. Diagnosing and mitigating laser preheat induced mix in MagLIF

Author

Harvey-Thompson, A. J., primary, Weis, M. R., additional, Harding, E. C., additional, Geissel, M., additional, Ampleford, D. J., additional, Chandler, G. A., additional, Fein, J. R., additional, Glinsky, M. E., additional, Gomez, M. R., additional, Hahn, K. D., additional, Hansen, S. B., additional, Jennings, C. A., additional, Knapp, P. F., additional, Paguio, R. R., additional, Perea, L., additional, Peterson, K. J., additional, Porter, J. L., additional, Rambo, P. K., additional, Robertson, G. K., additional, Rochau, G. A., additional, Ruiz, D. E., additional, Schwarz, J., additional, Shores, J. E., additional, Sinars, D. B., additional, Slutz, S. A., additional, Smith, G. E., additional, Smith, I. C., additional, Speas, C. S., additional, and Whittemore, K., additional

Published
2018
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12. Polycapillary x-ray lenses for single-shot, laser-driven powder diffraction

Author

Schollmeier, M., primary, Ao, T., additional, Field, E. S., additional, Galloway, B. R., additional, Kalita, P., additional, Kimmel, M. W., additional, Morgan, D. V., additional, Rambo, P. K., additional, Schwarz, J., additional, Shores, J. E., additional, Smith, I. C., additional, Speas, C. S., additional, Benage, J. F., additional, and Porter, J. L., additional

Published
2018
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14. A 7.2 keV spherical x-ray crystal backlighter for two-frame, two-color backlighting at Sandia’s Z Pulsed Power Facility

Author

Schollmeier, M. S., primary, Knapp, P. F., additional, Ampleford, D. J., additional, Harding, E. C., additional, Jennings, C. A., additional, Lamppa, D. C., additional, Loisel, G. P., additional, Martin, M. R., additional, Robertson, G. K., additional, Shores, J. E., additional, Smith, I. C., additional, Speas, C. S., additional, Weis, M. R., additional, Porter, J. L., additional, and McBride, R. D., additional

Published
2017
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15. Nonlinear laser-plasma interaction in magnetized liner inertial fusion

Author

Geissel, Matthias, additional, Awe, T. J., additional, Bliss, D. E., additional, Campbell, M. E., additional, Gomez, M. R., additional, Harding, E., additional, Harvey-Thompson, A. J., additional, Hansen, S. B., additional, Jennings, C., additional, Kimmel, M. W., additional, Knapp, P., additional, Lewis, S. M., additional, McBride, R. D., additional, Peterson, K., additional, Schollmeier, M., additional, Scoglietti, D. J., additional, Sefkow, A. B., additional, Shores, J. E., additional, Sinars, D. B., additional, Slutz, S. A., additional, Smith, I. C., additional, Speas, C. S., additional, Vesey, R. A., additional, and Porter, J. L., additional

Published
2016
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17. Contrasting physics in wire array z pinch sources of 1-20 keV emission on the Z facility

Author

Ampleford, D. J., primary, Jones, B., additional, Jennings, C. A., additional, Hansen, S. B., additional, Cuneo, M. E., additional, Harvey-Thompson, A. J., additional, Rochau, G. A., additional, Coverdale, C. A., additional, Laspe, A. R., additional, Flanagan, T. M., additional, Moore, N. W., additional, Sinars, D. B., additional, Lamppa, D. C., additional, Harding, E. C., additional, Thornhill, J. W., additional, Giuliani, J. L., additional, Chong, Y.-K., additional, Apruzese, J. P., additional, Velikovich, A. L., additional, Dasgupta, A., additional, Ouart, N., additional, Sygar, W. A., additional, Savage, M. E., additional, Moore, J. K., additional, Focia, R., additional, Wagoner, T. C., additional, Killebrew, K. L., additional, Edens, A. D., additional, Dunham, G. S., additional, Jones, M. C., additional, Lake, P. W., additional, Nielsen, D. S., additional, Wu, M., additional, Carlson, A. L., additional, Kernahan, M. D., additional, Ball, C. R., additional, Scharberg, R. D., additional, Mulville, T. D., additional, Breden, E. W., additional, Speas, C. S., additional, Olivas, G., additional, Sullivan, M. A., additional, York, A. J., additional, Justus, D. W., additional, Cisneros, J. C., additional, Strizic, T., additional, Reneker, J., additional, Cleveland, M., additional, Vigil, M. P., additional, Robertson, G., additional, Sandoval, D., additional, Cox, C., additional, Maurer, A. J., additional, Graham, D. A., additional, Huynh, N. B., additional, Toledo, S., additional, Molina, L. P., additional, Lopez, M. R., additional, Long, F. W., additional, McKee, G. R., additional, Porter, J. L., additional, and Herrmann, M. C., additional

Published
2014
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20. 55-TW magnetically insulated transmission-line system: Design, simulations, and performance

Author

Stygar, W. A., primary, Corcoran, P. A., additional, Ives, H. C., additional, Spielman, R. B., additional, Douglas, J. W., additional, Whitney, B. A., additional, Mostrom, M. A., additional, Wagoner, T. C., additional, Speas, C. S., additional, Gilliland, T. L., additional, Allshouse, G. A., additional, Clark, R. E., additional, Donovan, G. L., additional, Hughes, T. P., additional, Humphreys, D. R., additional, Jaramillo, D. M., additional, Johnson, M. F., additional, Kellogg, J. W., additional, Leeper, R. J., additional, Long, F. W., additional, Martin, T. H., additional, Mulville, T. D., additional, Pelock, M. D., additional, Peyton, B. P., additional, Poukey, J. W., additional, Ramirez, J. J., additional, Reynolds, P. G., additional, Seamen, J. F., additional, Seidel, D. B., additional, Seth, A. P., additional, Sharpe, A. W., additional, Shoup, R. W., additional, Smith, J. W., additional, Van De Valde, D. M., additional, and Wavrik, R. W., additional

Published
2009
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21. Energy loss to conductors operated at lineal current densities≤10MA/cm: Semianalytic model, magnetohydrodynamic simulations, and experiment

Author

Stygar, W. A., primary, Rosenthal, S. E., additional, Ives, H. C., additional, Wagoner, T. C., additional, Allshouse, G. O., additional, Androlewicz, K. E., additional, Donovan, G. L., additional, Fehl, D. L., additional, Frese, M. H., additional, Gilliland, T. L., additional, Johnson, M. F., additional, Mills, J. A., additional, Reisman, D. B., additional, Reynolds, P. G., additional, Speas, C. S., additional, Spielman, R. B., additional, Struve, K. W., additional, Toor, A., additional, and Waisman, E. M., additional

Published
2008
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22. Differential-outputB-dot andD-dot monitors for current and voltage measurements on a 20-MA, 3-MV pulsed-power accelerator

Author

Wagoner, T. C., primary, Stygar, W. A., additional, Ives, H. C., additional, Gilliland, T. L., additional, Spielman, R. B., additional, Johnson, M. F., additional, Reynolds, P. G., additional, Moore, J. K., additional, Mourning, R. L., additional, Fehl, D. L., additional, Androlewicz, K. E., additional, Bailey, J. E., additional, Broyles, R. S., additional, Dinwoodie, T. A., additional, Donovan, G. L., additional, Dudley, M. E., additional, Hahn, K. D., additional, Kim, A. A., additional, Lee, J. R., additional, Leeper, R. J., additional, Leifeste, G. T., additional, Melville, J. A., additional, Mills, J. A., additional, Mix, L. P., additional, Moore, W. B. S., additional, Peyton, B. P., additional, Porter, J. L., additional, Rochau, G. A., additional, Rochau, G. E., additional, Savage, M. E., additional, Seamen, J. F., additional, Serrano, J. D., additional, Sharpe, A. W., additional, Shoup, R. W., additional, Slopek, J. S., additional, Speas, C. S., additional, Struve, K. W., additional, Van De Valde, D. M., additional, and Woodring, R. M., additional

Published
2008
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23. High-brightness, high-spatial-resolution, 6.151keV x-ray imaging of inertial confinement fusion capsule implosion and complex hydrodynamics experiments on Sandia’s Z accelerator (invited)

Author

Bennett, G. R., primary, Sinars, D. B., additional, Wenger, D. F., additional, Cuneo, M. E., additional, Adams, R. G., additional, Barnard, W. J., additional, Beutler, D. E., additional, Burr, R. A., additional, Campbell, D. V., additional, Claus, L. D., additional, Foresi, J. S., additional, Johnson, D. W., additional, Keller, K. L., additional, Lackey, C., additional, Leifeste, G. T., additional, McPherson, L. A., additional, Mulville, T. D., additional, Neely, K. A., additional, Rambo, P. K., additional, Rovang, D. C., additional, Ruggles, L. E., additional, Porter, J. L., additional, Simpson, W. W., additional, Smith, I. C., additional, and Speas, C. S., additional

Published
2006
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25. Theoreticalz-pinch scaling relations for thermonuclear-fusion experiments

Author

Stygar, W. A., primary, Cuneo, M. E., additional, Vesey, R. A., additional, Ives, H. C., additional, Mazarakis, M. G., additional, Chandler, G. A., additional, Fehl, D. L., additional, Leeper, R. J., additional, Matzen, M. K., additional, McDaniel, D. H., additional, McGurn, J. S., additional, McKenney, J. L., additional, Muron, D. J., additional, Olson, C. L., additional, Porter, J. L., additional, Ramirez, J. J., additional, Seamen, J. F., additional, Speas, C. S., additional, Spielman, R. B., additional, Struve, K. W., additional, Torres, J. A., additional, Waisman, E. M., additional, Wagoner, T. C., additional, and Gilliland, T. L., additional

Published
2005
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26. Flashover of a vacuum-insulator interface: A statistical model

Author

Stygar, W. A., primary, Ives, H. C., additional, Wagoner, T. C., additional, Lott, J. A., additional, Anaya, V., additional, Harjes, H. C., additional, Corley, J. P., additional, Shoup, R. W., additional, Fehl, D. L., additional, Mowrer, G. R., additional, Wallace, Z. R., additional, Anderson, R. A., additional, Boyes, J. D., additional, Douglas, J. W., additional, Horry, M. L., additional, Jaramillo, T. F., additional, Johnson, D. L., additional, Long, F. W., additional, Martin, T. H., additional, McDaniel, D. H., additional, Milton, O., additional, Mostrom, M. A., additional, Muirhead, D. A., additional, Mulville, T. D., additional, Ramirez, J. J., additional, Ramirez, L. E., additional, Romero, T. M., additional, Seamen, J. F., additional, Smith, J. W., additional, Speas, C. S., additional, Spielman, R. B., additional, Struve, K. W., additional, Vogtlin, G. E., additional, Walsh, D. E., additional, Walsh, E. D., additional, Walsh, M. D., additional, and Yamamoto, O., additional

Published
2004
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27. X-ray emission fromzpinches at107A: Current scaling, gap closure, and shot-to-shot fluctuations

Author

Stygar, W. A., primary, Ives, H. C., additional, Fehl, D. L., additional, Cuneo, M. E., additional, Mazarakis, M. G., additional, Bailey, J. E., additional, Bennett, G. R., additional, Bliss, D. E., additional, Chandler, G. A., additional, Leeper, R. J., additional, Matzen, M. K., additional, McDaniel, D. H., additional, McGurn, J. S., additional, McKenney, J. L., additional, Mix, L. P., additional, Muron, D. J., additional, Porter, J. L., additional, Ramirez, J. J., additional, Ruggles, L. E., additional, Seamen, J. F., additional, Simpson, W. W., additional, Speas, C. S., additional, Spielman, R. B., additional, Struve, K. W., additional, Torres, J. A., additional, Vesey, R. A., additional, Wagoner, T. C., additional, Gilliland, T. L., additional, Horry, M. L., additional, Jobe, D. O., additional, Lazier, S. E., additional, Mills, J. A., additional, Mulville, T. D., additional, Pyle, J. H., additional, Romero, T. M., additional, Seamen, J. J., additional, and Smelser, R. M., additional

Published
2004
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28. Symmetric inertial confinement fusion capsule implosions in a high-yield-scale double-Z-pinch-driven hohlraum on Z

Author

Bennett, G. R., primary, Vesey, R. A., additional, Cuneo, M. E., additional, Porter, J. L., additional, Adams, R. G., additional, Aragon, R. A., additional, Rambo, P. K., additional, Rovang, D. C., additional, Ruggles, L. E., additional, Simpson, W. W., additional, Smith, I. C., additional, Speas, C. S., additional, Struve, K. W., additional, Wenger, D. F., additional, and Landen, O. L., additional

Published
2003
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29. Nonlinear laser-plasma interaction in magnetized liner inertial fusion

Author

Vodopyanov, Konstantin L., Schepler, Kenneth L., Geissel, Matthias, Awe, T. J., Bliss, D. E., Campbell, M. E., Gomez, M. R., Harding, E., Harvey-Thompson, A. J., Hansen, S. B., Jennings, C., Kimmel, M. W., Knapp, P., Lewis, S. M., McBride, R. D., Peterson, K., Schollmeier, M., Scoglietti, D. J., Sefkow, A. B., Shores, J. E., Sinars, D. B., Slutz, S. A., Smith, I. C., Speas, C. S., Vesey, R. A., and Porter, J. L.

Published
2016
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30. Theoretical z -pinch scaling relations for thermonuclear-fusion experiments.

Author

Stygar WA, Cuneo ME, Vesey RA, Ives HC, Mazarakis MG, Chandler GA, Fehl DL, Leeper RJ, Matzen MK, McDaniel DH, McGurn JS, McKenney JL, Muron DJ, Olson CL, Porter JL, Ramirez JJ, Seamen JF, Speas CS, Spielman RB, Struve KW, Torres JA, Waisman EM, Wagoner TC, and Gilliland TL

Abstract

We have developed wire-array z -pinch scaling relations for plasma-physics and inertial-confinement-fusion (ICF) experiments. The relations can be applied to the design of z -pinch accelerators for high-fusion-yield (approximately 0.4 GJ/shot) and inertial-fusion-energy (approximately 3 GJ/shot) research. We find that (delta(a)/delta(RT)) proportional (m/l)1/4 (Rgamma)(-1/2), where delta(a) is the imploding-sheath thickness of a wire-ablation-dominated pinch, delta(RT) is the sheath thickness of a Rayleigh-Taylor-dominated pinch, m is the total wire-array mass, l is the axial length of the array, R is the initial array radius, and gamma is a dimensionless functional of the shape of the current pulse that drives the pinch implosion. When the product Rgamma is held constant the sheath thickness is, at sufficiently large values of m/l, determined primarily by wire ablation. For an ablation-dominated pinch, we estimate that the peak radiated x-ray power P(r) proportional (I/tau(i))(3/2)Rlphigamma, where I is the peak pinch current, tau(i) is the pinch implosion time, and phi is a dimensionless functional of the current-pulse shape. This scaling relation is consistent with experiment when 13 MA < or = I < or = 20 MA, 93 ns < or = tau(i) < or = 169 ns, 10 mm < or = R < or = 20 mm, 10 mm < or = l < or = 20 mm, and 2.0 mg/cm < or = m/l < or = 7.3 mg/cm. Assuming an ablation-dominated pinch and that Rlphigamma is held constant, we find that the x-ray-power efficiency eta(x) congruent to P(r)/P(a) of a coupled pinch-accelerator system is proportional to (tau(i)P(r)(7/9 ))(-1), where P(a) is the peak accelerator power. The pinch current and accelerator power required to achieve a given value of P(r) are proportional to tau(i), and the requisite accelerator energy E(a) is proportional to tau2(i). These results suggest that the performance of an ablation-dominated pinch, and the efficiency of a coupled pinch-accelerator system, can be improved substantially by decreasing the implosion time tau(i). For an accelerator coupled to a double-pinch-driven hohlraum that drives the implosion of an ICF fuel capsule, we find that the accelerator power and energy required to achieve high-yield fusion scale as tau(i)0.36 and tau(i)1.36, respectively. Thus the accelerator requirements decrease as the implosion time is decreased. However, the x-ray-power and thermonuclear-yield efficiencies of such a coupled system increase with tau(i). We also find that increasing the anode-cathode gap of the pinch from 2 to 4 mm increases the requisite values of P(a) and E(a) by as much as a factor of 2.

Published
2005
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31. X-ray emission from z pinches at 10 7 A: current scaling, gap closure, and shot-to-shot fluctuations.

Author

Stygar WA, Ives HC, Fehl DL, Cuneo ME, Mazarakis MG, Bailey JE, Bennett GR, Bliss DE, Chandler GA, Leeper RJ, Matzen MK, McDaniel DH, McGurn JS, McKenney JL, Mix LP, Muron DJ, Porter JL, Ramirez JJ, Ruggles LE, Seamen JF, Simpson WW, Speas CS, Spielman RB, Struve KW, Torres JA, Vesey RA, Wagoner TC, Gilliland TL, Horry ML, Jobe DO, Lazier SE, Mills JA, Mulville TD, Pyle JH, Romero TM, Seamen JJ, and Smelser RM

Abstract

We have measured the x-ray power and energy radiated by a tungsten-wire-array z pinch as a function of the peak pinch current and the width of the anode-cathode gap at the base of the pinch. The measurements were performed at 13- and 19-MA currents and 1-, 2-, 3-, and 4-mm gaps. The wire material, number of wires, wire-array diameter, wire-array length, wire-array-electrode design, normalized-pinch-current time history, implosion time, and diagnostic package were held constant for the experiments. To keep the implosion time constant, the mass of the array was increased as I2 (i.e., the diameter of each wire was increased as I), where I is the peak pinch current. At 19 MA, the mass of the 300-wire 20-mm-diam 10-mm-length array was 5.9 mg. For the configuration studied, we find that to eliminate the effects of gap closure on the radiated energy, the width of the gap must be increased approximately as I. For shots unaffected by gap closure, we find that the peak radiated x-ray power P(r) proportional to I1.24+/-0.18, the total radiated x-ray energy E(r) proportional to I1.73+/-0.18, the x-ray-power rise time tau(r) proportional to I0.39+/-0.34, and the x-ray-power pulse width tau(w) proportional to demonstrate that the internal energy and radiative opacity of the pinch are not responsible for the observed subquadratic power scaling. Heuristic wire-ablation arguments suggest that quadratic power scaling will be achieved if the implosion time tau(i) is scaled as I(-1/3). The measured 1sigma shot-to-shot fluctuations in P(r), E(r), tau(r), tau(w), and tau(i) are approximately 12%, 9%, 26%, 9%, and 2%, respectively, assuming that the fluctuations are independent of I. These variations are for one-half of the pinch. If the half observed radiates in a manner that is statistically independent of the other half, the variations are a factor of 2(1/2) less for the entire pinch. We calculate the effect that shot-to-shot fluctuations of a single pinch would have on the shot-success probability of the double-pinch inertial-confinement-fusion driver proposed by Hammer et al. [Phys. Plasmas 6, 2129 (1999)]. We find that on a given shot, the probability that two independent pinches would radiate the same peak power to within a factor of 1+/-alpha (where 0< or =alpha<<1) is equal to erf(alpha/2sigma), where sigma is the 1sigma fractional variation of the peak power radiated by a single pinch. Assuming alpha must be < or =7% to achieve adequate odd-Legendre-mode radiation symmetry for thermonuclear-fusion experiments, sigma must be <3% for the shot-success probability to be > or =90%. The observed (12/2(1/2))%=8.5% fluctuation in P(r) would provide adequate symmetry on 44% of the shots. We propose that three-dimensional radiative-magnetohydrodynamic simulations be performed to quantify the sensitivity of the x-ray emission to various initial conditions, and to determine whether an imploding z pinch is a spatiotemporal chaotic system.

Published
2004
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