Zobrazeno 1 - 10
of 20
pro vyhledávání: '"J. W. Thornhill"'
Autor:
Gregory Rochau, J. W. Thornhill, Brent Manley Jones, M. E. Cuneo, A. J. Harvey-Thompson, Christopher Jennings, J. P. Apruzese, Derek C. Lamppa, John Giuliani, D. J. Ampleford, Stephanie Hansen, N. W. Moore, Christine Anne Coverdale, Arati Dasgupta
Publikováno v:
AIP Conference Proceedings.
Radiation magnetohydrodynamic r-z simulations are performed of recent Ar shots on the refurbished Z generator to examine the effective ion temperature as determined from the observed line width of the He-γ line. While many global radiation propertie
Autor:
J. W. Thornhill, M. E. Cuneo, Brent Manley Jones, A. J. Harvey-Thompson, N. W. Moore, John Giuliani, N. D. Ouart, Gregory Rochau, Derek C. Lamppa, D. J. Ampleford, Christine Anne Coverdale, Stephanie Hansen, Christopher Jennings, J. P. Apruzese
Publikováno v:
AIP Conference Proceedings.
The refurbished Z machine at Sandia National Laboratories has been successfully configured to drive gas-puff Z pinches. A series of experiments using Ar loads produced K-shell yields of 330 ± 9% kJ, with highly reproducible K-shell spectra and power
Autor:
T. L. Gilliland, T. W. L. Sanford, P. E. Pulsifer, R. B. Spielman, J. F. Seamen, K.G. Whitney, R. C. Mock, John P. Apruzese, J. S. McGurn, D. O. Jobe, Thomas J. Nash, J. W. Thornhill, M. Vargas
Publikováno v:
Review of Scientific Instruments. 68:852-857
Time-resolved x-ray pinhole photographs and time-integrated radially resolved x-ray crystal-spectrometer measurements of azimuthally symmetric aluminum-wire implosions suggest that the densest phase of the pinch is composed of a hot plasma core surro
Publikováno v:
2012 Abstracts IEEE International Conference on Plasma Science.
Summary form only given. (Mach2-TCRE is a two-dimensional (R-Z) radiation MHD Z-pinch simulation code with non-LTE population kinetics and radiation transport using ray tracing. The tabular collisional radiative equilibrium (CRE) based equation-of -s
Autor:
J. W. Thornhill, J. L. Giuliani, J. P. Apruzese, Y. K. Chong, J. Davis, A. Dasgupta, K. G. Whitney, R. W. Clark, B. Jones, C. A. Coverdale, D. J. Ampleford, M. E. Cuneo, C. Deeney, Bruce R. Kusse, David A. Hammer
Publikováno v:
AIP Conference Proceedings.
Many physical effects can produce unstable plasma behavior that affect K‐shell emission from arrays. Such effects include: asymmetry in the initial density profile, asymmetry in power flow, thermal conduction at the boundaries, and non‐uniform wi
Autor:
A. Dasgupta, J. Davis, R. W. Clark, J. W. Thornhill, J. L. Giuliani, K. G. Whitney, Y. K. Chong, Bruce R. Kusse, David A. Hammer
Publikováno v:
AIP Conference Proceedings.
The implosion dynamics of an array of stainless steel (SS) wires on the Z and/or ZR accelerator produces an abundance of radiation from the K‐ and L‐shell ionization stages. As the plasma assembles on axis, a number of time resolved snapshots pro
Autor:
R. J. Commisso, J. P. Apruzese, J. Davis, S. L. Jackson, D. Mosher, D. P. Murphy, J. W. Thornhill, A. L. Velikovich, B. V. Weber, F. C. Young, J. S. Levine, B. H. Failor, H. Sze, N. Qi, J. W. Barrister, P. L. Coleman, K. Wilson, M. Krishnan, C. A. Coverdale, B. Jones, C. Deeney, Bruce R. Kusse, David A. Hammer
Publikováno v:
AIP Conference Proceedings.
This paper reviews the motivation for, results from, and analyses of 12‐cm‐diameter argon gas‐puff experiments carried out over the last four years on three generators at 3.2‐ to 6.5‐MA peak currents, all with implosion times ⩾200 ns. Usi
Autor:
R. W. Clark, J. L. Giuliani, J. W. Thornhill, Y. K. Chong, A. Dasgupta, J. Davis, Bruce R. Kusse, David A. Hammer
Publikováno v:
AIP Conference Proceedings.
A 2D radiation MHD model has been developed to investigate stainless steel wire array implosion experiments on the Z and refurbished Z machines. This model incorporates within the Mach2 MHD code a self‐consistent calculation of the non‐LTE kineti
Autor:
J. Davis, A. Dasgupta, J. W. Thornhill, J. Giuliani, R. W. Clark, K. Whitney, C. A. Coverdale, D. Lepell, B. Jones, C. Deeney, Bruce R. Kusse, David A. Hammer
Publikováno v:
AIP Conference Proceedings.
Experiments on the Z accelerator with nested stainless steel wire arrays produced K‐shell x‐ray yields exceeding 50 kJ in the energy range 5.5 to 8 keV. Stainless steel (Z = 24–28) can barely be ionized to the K‐shell on Z, and the spectra ar
Properties of the Best Ar K-Shell Radiators: Two Decades of Data Analysis from Seven Z-Pinch Drivers
Autor:
J. P. Apruzese, R. J. Commisso, B. V. Weber, D. Mosher, F. C. Young, J. W. Thornhill, J. L. Giuliani, J. S. Levine, B. H. Failor, H. Sze, N. Qi, J. W. Banister, P. L. Coleman, C. A. Coverdale, C. Deeney, Bruce R. Kusse, David A. Hammer
Publikováno v:
AIP Conference Proceedings.
Z Pinches formed from Ar gas puffs have been investigated for more than two decades. Experiments have been performed on many generators; a frequent objective has been maximization of the yield in the K‐shell lines. The increase in available current