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Penetrating radiography of imploding and stagnating beryllium liners on the Z accelerator

Physical Review Letters

McBride, Ryan D.; Peterson, Kyle J.; Sefkow, Adam B.; Nakhleh, Charles N.; Laspe, Amy R.; Lopez, Mike R.; Smith, Ian C.; Atherton, B.W.; Savage, Mark E.; Stygar, William A.; Slutz, Stephen A.; Rogers, Thomas J.; Jennings, Christopher A.; Sinars, Daniel S.; Cuneo, M.E.; Herrmann, Mark H.; Lemke, Raymond W.; Martin, Matthew; Vesey, Roger A.

Abstract not provided.

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TYPE Journal Article YEAR 2012
OSTIDOI

Transmission line and electromagnetic models of the Mykonos-2 accelerator

Digest of Technical Papers-IEEE International Pulsed Power Conference

Madrid, E.A.; Miller, C.L.; Rose, D.V.; Welch, D.R.; Clark, R.E.; Mostrom, C.B.; Stygar, William A.; Savage, Mark E.; Hinshelwood, D.D.; LeChien, K.R.

Mykonos is a linear transformer driver (LTD) pulsed power accelerator currently undergoing testing at Sandia National Laboratories. Mykonos-2, the initial configuration, includes two 1-MA, 200-kV LTD cavities driving a water-filled transmission line terminated by a resistive load. Transmission line and 3D electromagnetic (EM) simulation models of high-current LTD cavities have been developed [D.V. Rose et al. Phys. Rev. ST Accel. Beams 13, 90401 (2010)]. These models have been used to develop an equivalent two-cavity transmission line model of Mykonos-2 using the BERTHA transmission line code. The model explicitly includes 40 bricks per cavity and detailed representations of the water-filled transmission line and resistive load. (A brick consists of two capacitors and a switch connected in series.) This model is compared to 3D EM simulations of the entire accelerator including detailed representations of the individual capacitors and switches in each cavity. Good agreement is obtained between the two simulation models and both models are in good agreement with preliminary data from Mykonos-2. © 2011 IEEE.

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TYPE Conference YEAR 2011
ScopusOSTI

Temporally shaped current pulses on a two-cavity linear transformer driver system

Digest of Technical Papers-IEEE International Pulsed Power Conference

Savage, Mark E.; Mazarakis, Michael G.; LeChien, K.R.; Stoltzfus, Brian S.; Stygar, William A.; Fowler, William E.; Madrid, E.A.; Miller, C.L.; Rose, D.V.

An important application for low impedance pulsed power drivers is creating high pressures for shock compression of solids. These experiments are useful for studying material properties under kilobar to megabar pressures. The Z driver at Sandia National Laboratories has been used for such studies on a variety of materials, including heavy water, diamond, and tantalum, to name a few. In such experiments, it is important to prevent shock formation in the material samples. Shocks can form as the sound speed increases with loading; at some depth in the sample a pressure significantly higher than the surface pressure can result. The optimum pressure pulse shape to prevent such shocks depends on the test material and the sample thickness, and is generally not a simple sinusoidal-shaped current as a function of time. A system that can create a variety of pulse shapes would be desirable for testing various materials and sample thicknesses. A large number of relatively fast pulses, combined, could create the widest variety of pulse shapes. Linear transformer driver systems, whose cavities consist of many parallel capacitor-switch circuits, could have considerable agility in pulse shape. © 2011 IEEE.

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TYPE Conference YEAR 2011
ScopusOSTI

Measurements of Magneto-Rayleigh-Taylor instability growth in initially solid liners on the Z facility

Sinars, Daniel S.; Edens, Aaron E.; Lopez, Mike R.; Smith, Ian C.; Slutz, Stephen A.; Shores, Jonathon S.; Bennett, Guy R.; Atherton, B.W.; Savage, Mark E.; Stygar, William A.; Leifeste, Gordon T.; Herrmann, Mark H.; Cuneo, M.E.; Peterson, Kyle J.; McBride, Ryan D.; Jennings, Christopher A.; Vesey, Roger A.; Nakhleh, Charles N.

Abstract not provided.

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TYPE Conference YEAR 2011
OSTI

Measurements of magneto-Rayleigh-Taylor instability growth during the implosion of initially solid metal liners

Physics of Plasmas

Sinars, Daniel S.; Edens, Aaron E.; Lopez, Mike R.; Smith, Ian C.; Shores, Jonathon S.; Slutz, Stephen A.; Bennett, Guy R.; Atherton, B.W.; Savage, Mark E.; Stygar, William A.; Leifeste, Gordon T.; Herrmann, Mark H.; McBride, Ryan D.; Cuneo, M.E.; Jennings, Christopher A.; Peterson, Kyle J.; Vesey, Roger A.; Nakhleh, Charles N.

Abstract not provided.

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TYPE Journal Article YEAR 2010
OSTI
Results 76–100 of 200
Results 76–100 of 200