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Towards a predictive MHD simulation capability for designing hypervelocity magnetically-driven flyer plates and PWclass z-pinch x-ray sources on Z and ZR

Mehlhorn, Thomas A.; Yu, Edmund Y.; Vesey, Roger A.; Cuneo, M.E.; Jones, Brent M.; Knudson, Marcus D.; Sinars, Daniel S.; Robinson, Allen C.; Trucano, Timothy G.; Brunner, Thomas A.; Desjarlais, Michael P.; Garasi, Christopher J.; Haill, Thomas A.; Hanshaw, Heath L.; Lemke, Raymond W.; Oliver, Bryan V.; Peterson, Kyle J.

Abstract not provided.

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TYPE Conference YEAR 2007
OSTI

1- and 2-frame monochromatic x-ray imaging of NIF-like capsules on Z and future higher-energy higher-resolution 2- & 4-frame x-radiography plans for ZR

Bennett, Guy R.; Campbell, David V.; Claus, Liam D.; Foresi, James S.; Johnson, Drew J.; Jones, Michael J.; Keller, Keith L.; Leifeste, Gordon T.; McPherson, Leroy A.; Mulville, Thomas D.; Neely, Kelly A.; Sinars, Daniel S.; Herrmann, Mark H.; Rambo, Patrick K.; Rovang, Dean C.; Ruggles, Larry R.; Simpson, Walter W.; Speas, Christopher S.; Wenger, D.F.; Smith, Ian C.; Cuneo, M.E.; Adams, Richard G.; Atherton, B.W.; Barnard, Wilson J.; Beutler, David E.; Burr, Robert A.

Abstract not provided.

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TYPE Conference YEAR 2006
OSTI

Progress in symmetric ICF capsule implosions and wire-array z-pinch source physics for double z-pinch driven hohlraums

Proposed for publication in Plasma Physics and Controlled Fusion.

Cuneo, M.E.; Nash, Thomas J.; Yu, Edmund Y.; Mehlhorn, Thomas A.; Matzen, M.K.; Vesey, Roger A.; Bennett, Guy R.; Sinars, Daniel S.; Stygar, William A.; Rambo, Patrick K.; Smith, Ian C.; Bliss, David E.

Over the last several years, rapid progress has been made evaluating the double-z-pinch indirect-drive, inertial confinement fusion (ICF) high-yield target concept (Hammer et al 1999 Phys. Plasmas 6 2129). We have demonstrated efficient coupling of radiation from two wire-array-driven primary hohlraums to a secondary hohlraum that is large enough to drive a high yield ICF capsule. The secondary hohlraum is irradiated from two sides by z-pinches to produce low odd-mode radiation asymmetry. This double-pinch source is driven from a single electrical power feed (Cuneo et al 2002 Phys. Rev. Lett. 88 215004) on the 20 MA Z accelerator. The double z-pinch has imploded ICF capsules with even-mode radiation symmetry of 3.1 {+-} 1.4% and to high capsule radial convergence ratios of 14-21 (Bennett et al 2002 Phys. Rev. Lett. 89 245002; Bennett et al 2003 Phys. Plasmas 10 3717; Vesey et al 2003 Phys. Plasmas 10 1854). Advances in wire-array physics at 20 MA are improving our understanding of z-pinch power scaling with increasing drive current. Techniques for shaping the z-pinch radiation pulse necessary for low adiabat capsule compression have also been demonstrated.

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TYPE Journal Article YEAR 2005
OSTI

Tungsten wire number dependence of the implosion dynamics at the Z-accelerator

Plasma Devices and Operations

Mazarakis, Michael G.; Deeney, C.E.; Douglas, M.R.; Stygar, William A.; Sinars, Daniel S.; Cuneo, M.E.; Chittenden, J.; Chandler, G.A.; Nash, T.J.; Struve, K.W.; McDaniel, D.H.

In this paper, we report the results of an experimental campaign to study the initiation, implosion dynamics and radiation yield of tungsten wire arrays as a function of the wire number. An optimization study of the X-ray emitted peak power, rise time and FWHM was effectuated by varying the wire number while keeping the total array mass constant at ∼5.8mg. The driver used was the ∼20MA Z-accelerator, in its usual short pulse mode of 100ns. We studied single arrays of diameter 20mm and height 10mm. The smaller wire number studied was 30 and the largest 600. It appears that 600 is the highest wire number achievable with present-day technology. Radial and axial diagnostics were used, including a crystal monochromatic X-ray backlighter. An optimum wire number of ∼370 was observed, which is very close to the number (300) routinely used for the ICF program in Sandia. © 2005 Taylor & Francis Group Ltd.

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TYPE Journal Article YEAR 2005
ScopusOSTI

Mass profile and instability growth measurements for 300-wire z-pinch implosions driven by 14-18, MA

Proposed for publication in Physical Review Letters.

Sinars, Daniel S.; Cuneo, M.E.; Yu, Edmund Y.; Bliss, David E.; Nash, Thomas J.; Deeney, Christopher D.; Mazarakis, Michael G.; Wenger, D.F.

We present the first comprehensive study of high wire-number, wire-array Z-pinch dynamics at 14-18 MA using x-ray backlighting and optical shadowgraphy diagnostics. The cylindrical arrays retain slowly expanding, dense wire cores at the initial position up to 60% of the total implosion time. Azimuthally correlated instabilities at the array edge appear during this stage which continue to grow in amplitude and wavelength after the start of bulk motion, resulting in measurable trailing mass that does not arrive on axis before peak x-ray emission.

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TYPE Journal Article YEAR 2004
OSTI

[Copy of characteristics and scaling of tungsten-wire-array z-pinch implosion dynamics at 20 MA.]

Proposed for publication in Physics of Plasmas.

Vesey, Roger A.; Yu, Edmund Y.; Nash, Thomas J.; Bliss, David E.; Bennett, Guy R.; Sinars, Daniel S.; Simpson, Walter W.; Ruggles, Larry R.; Wenger, D.F.; Garasi, Christopher J.; Aragon, Rafael A.; Fowler, William E.; Johnson, Drew J.; Keller, Keith L.; McGurn, John S.; Mehlhorn, Thomas A.; Speas, Christopher S.; Struve, Kenneth W.; Stygar, William A.; Chandler, Gordon A.

Abstract not provided.

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TYPE Journal Article YEAR 2004
OSTI

Z facility diagnostic system for high energy density physics at Sandia National Laboratories

Leeper, Ramon J.; Deeney, Christopher D.; Dunham, Gregory S.; Fehl, David L.; Franklin, James K.; Hanson, David L.; Hawn, Rona E.; Hall, Clint A.; Hurst, Michael J.; Jinzo, Tanya D.; Jobe, Daniel O.; Joseph, Nathan R.; Knudson, Marcus D.; Lake, Patrick W.; Lazier, Steven E.; Lucas, J.; McGurn, John S.; Manicke, Matthew P.; Mock, Raymond M.; Moore, T.C.; Nash, Thomas J.; Bailey, James E.; Nelson, Alan J.; Nielsen, D.S.; Olson, Richard E.; Porter, John L.; Pyle, John H.; Rochau, G.A.; Ruggles, Larry R.; Ruiz, Carlos L.; Sanford, Thomas W.; Seamen, Johann J.; Bennett, Guy R.; Simpson, Walter W.; Sinars, Daniel S.; Speas, Christopher S.; Stygar, William A.; Torres, Jose A.; Wenger, D.F.; Carlson, Alan L.; Chandler, Gordon A.; Cooper, Gary W.; Cuneo, M.E.

Abstract not provided.

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TYPE Conference YEAR 2003
OSTI

1-to 10-keV x-ray backlighting of annular wire arrays on the Sandia Z-machine using bent-crystal imaging techniques

Sinars, Daniel S.; Smith, Ian C.; Wenger, D.F.; Cuneo, M.E.; Bennett, Guy R.; Anderson, Jessica E.; Porter, John L.; Rambo, Patrick K.; Rovang, Dean C.

Annular wire array implosions on the Sandia Z-machine can produce >200 TW and 1-2 MJ of soft x rays in the 0.1-10 keV range. The x-ray flux and debris in this environment present significant challenges for radiographic diagnostics. X-ray backlighting diagnostics at 1865 and 6181 eV using spherically-bent crystals have been fielded on the Z-machine, each with a {approx}0.6 eVspectral bandpass, 10 {micro}m spatial resolution, and a 4 mm by 20mm field of view. The Z-Beamlet laser, a 2-TW, 2-kJ Nd:glass laser({lambda} = 527 nm), is used to produce 0.1-1 J x-ray sources for radiography. The design, calibration, and performance of these diagnostics is presented.

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TYPE Conference YEAR 2003
OSTI
Results 301–325 of 326
Results 301–325 of 326