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FLEXO: Development of a Discontinuous Galerkin Multimaterial Magneto-Hydrodynamics Code for MagLIF Simulation

Beckwith, Kristian B.; Beckwith, Kristian B.; Bond, Stephen D.; Bond, Stephen D.; Granzow, Brian N.; Granzow, Brian N.; Hamlin, Nathaniel D.; Hamlin, Nathaniel D.; Martin, Matthew; Martin, Matthew; Powell, Michael P.; Powell, Michael P.; Ruggirello, Kevin P.; Ruggirello, Kevin P.; Stagg, Alan K.; Stagg, Alan K.; Voth, Thomas E.; Voth, Thomas E.

Abstract not provided.

Recent Diagnostic Platform Accomplishments for Studying Vacuum Power Flow Physics at the Sandia Z Accelerator

Laity, George R.; Aragon, Carlos A.; Bennett, Nichelle L.; Bliss, David E.; Dolan, Daniel H.; Fierro, Andrew S.; Gomez, Matthew R.; Hess, Mark H.; Hutsel, Brian T.; Jennings, Christopher A.; Johnston, Mark D.; Kossow, Michael R.; Lamppa, Derek C.; Martin, Matthew; Patel, Sonal P.; Porwitzky, Andrew J.; Robinson, Allen C.; Rose, David V.; VanDevender, Pace V.; Waisman, Eduardo M.; Webb, Timothy J.; Welch, Dale R.; Rochau, G.A.; Savage, Mark E.; Stygar, William S.; White, William M.; Sinars, Daniel S.; Cuneo, M.E.

Abstract not provided.

Development of the Flexo XMHD Code

Beckwith, Kristian B.; Beckwith, Kristian B.; Beckwith, Kristian B.; Beckwith, Kristian B.; Bond, Stephen D.; Bond, Stephen D.; Bond, Stephen D.; Bond, Stephen D.; Granzow, Brian N.; Granzow, Brian N.; Granzow, Brian N.; Granzow, Brian N.; Jennings, Christopher A.; Jennings, Christopher A.; Jennings, Christopher A.; Jennings, Christopher A.; Martin, Matthew; Martin, Matthew; Martin, Matthew; Martin, Matthew; Porwitzky, Andrew J.; Porwitzky, Andrew J.; Porwitzky, Andrew J.; Porwitzky, Andrew J.; Stagg, Alan K.; Stagg, Alan K.; Stagg, Alan K.; Stagg, Alan K.; Voth, Thomas E.; Voth, Thomas E.; Voth, Thomas E.; Voth, Thomas E.

Abstract not provided.

Stagnation Morphology in Magnetized Liner Inertial Fusion Experiments

Gomez, Matthew R.; Harding, Eric H.; Ampleford, David A.; Jennings, Christopher A.; Awe, Thomas J.; Chandler, Gordon A.; Glinsky, Michael E.; Hahn, Kelly D.; Hansen, Stephanie B.; Jones, Brent M.; Knapp, Patrick K.; Martin, Matthew; Peterson, Kyle J.; Rochau, G.A.; Ruiz, Carlos L.; Schmit, Paul S.; Sinars, Daniel S.; Slutz, Stephen A.; Weis, Matthew R.; Yu, Edmund Y.

Abstract not provided.

Magnetically-Driven Convergent Instability Growth platform on Z

Knapp, Patrick K.; Mattsson, Thomas M.; Martin, Matthew; Benage, John F.

Hydrodynamic instability growth is a fundamentally limiting process in many applications. In High Energy Density Physics (HEDP) systems such as inertial confinement fusion implosions and stellar explosions, hydro instabilities can dominate the evolution of the object and largely determine the final state achievable. Of particular interest is the process by which instabilities cause perturbations at a density or material interface to grow nonlinearly, introducing vorticity and eventually causing the two species to mix across the interface. Although quantifying instabilities has been the subject of many investigations in planar geometry, few have been done in converging geometry. During FY17, the team executed six convergent geometry instability experiments. Based on earlier results, the platform was redesigned and improved with respect to load centering at installation making the installation reproducible and development of a new 7.2 keV, Co He-a backlighter system to better penetrate the liner. Together, the improvements yielded significantly improved experimental results. The results in FY17 demonstrate the viability of using experiments on Z to quantify instability growth in cylindrically convergent geometry. Going forward, we will continue the partnership with staff and management at LANL to analyze the past experiments, compare to hydrodynamics growth models, and design future experiments.

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A Path to Increased Performance in Magnetized Liner Inertial Fusion

Gomez, Matthew R.; Slutz, Stephen A.; Jennings, Christopher A.; Harvey-Thompson, Adam J.; Weis, Matthew R.; Lamppa, Derek C.; Hutsel, Brian T.; Ampleford, David A.; Awe, Thomas J.; Bliss, David E.; Chandler, Gordon A.; Geissel, Matthias G.; Hahn, Kelly D.; Hansen, Stephanie B.; Harding, Eric H.; Hess, Mark H.; Knapp, Patrick K.; Laity, George R.; Martin, Matthew; Nagayama, Taisuke N.; Rovang, Dean C.; Ruiz, Carlos L.; Savage, Mark E.; Schmit, Paul S.; Schwarz, Jens S.; Smith, Ian C.; Vesey, Roger A.; Yu, Edmund Y.; Cuneo, M.E.; Jones, Brent M.; Peterson, Kyle J.; Porter, John L.; Rochau, G.A.; Sinars, Daniel S.; Stygar, William A.

Abstract not provided.

Overview of Neutron diagnostic measurements for MagLIF Experiments on the Z Accelerator

Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, Patrick K.; Schmit, Paul S.; Harding, Eric H.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, James A.; Cuneo, M.E.; Glebov, V.Yu.; Harvey-Thompson, Adam J.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Lash, Joel S.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Abstract not provided.

DIAGNOSING MAGNETIZED LINER INERTIAL FUSION EXPERIMENTS USING NEUTRON DIAGNOSTICS ON THE Z ACCELERATOR

Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, Patrick K.; Schmit, Paul S.; Harding, Eric H.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, James A.; Cuneo, M.E.; Glebov, V.Yu.; Harvey-Thompson, Adam J.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Lash, Joel S.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Abstract not provided.

Implementing and diagnosing magnetic flux compression on the Z pulsed power accelerator

McBride, Ryan D.; Bliss, David E.; Gomez, Matthew R.; Hansen, Stephanie B.; Martin, Matthew; Jennings, Christopher A.; Slutz, Stephen A.; Rovang, Dean C.; Knapp, Patrick K.; Schmit, Paul S.; Awe, Thomas J.; Hess, Mark H.; Lemke, Raymond W.; Dolan, Daniel H.; Lamppa, Derek C.; Jobe, Marc R.; Fang, Lu F.; Hahn, Kelly D.; Chandler, Gordon A.; Cooper, Gary W.; Ruiz, Carlos L.; Robertson, Grafton K.; Cuneo, M.E.; Sinars, Daniel S.; Tomlinson, Kurt T.; Smith, Gary S.; Paguio, Reny P.; Intrator, Tom P.; Weber, Thomas E.; Greenly, John B.

We report on the progress made to date for a Laboratory Directed Research and Development (LDRD) project aimed at diagnosing magnetic flux compression on the Z pulsed-power accelerator (0-20 MA in 100 ns). Each experiment consisted of an initially solid Be or Al liner (cylindrical tube), which was imploded using the Z accelerator's drive current (0-20 MA in 100 ns). The imploding liner compresses a 10-T axial seed field, B z ( 0 ) , supplied by an independently driven Helmholtz coil pair. Assuming perfect flux conservation, the axial field amplification should be well described by B z ( t ) = B z ( 0 ) x [ R ( 0 ) / R ( t )] 2 , where R is the liner's inner surface radius. With perfect flux conservation, B z ( t ) and dB z / dt values exceeding 10 4 T and 10 12 T/s, respectively, are expected. These large values, the diminishing liner volume, and the harsh environment on Z, make it particularly challenging to measure these fields. We report on our latest efforts to do so using three primary techniques: (1) micro B-dot probes to measure the fringe fields associated with flux compression, (2) streaked visible Zeeman absorption spectroscopy, and (3) fiber-based Faraday rotation. We also mention two new techniques that make use of the neutron diagnostics suite on Z. These techniques were not developed under this LDRD, but they could influence how we prioritize our efforts to diagnose magnetic flux compression on Z in the future. The first technique is based on the yield ratio of secondary DT to primary DD reactions. The second technique makes use of the secondary DT neutron time-of-flight energy spectra. Both of these techniques have been used successfully to infer the degree of magnetization at stagnation in fully integrated Magnetized Liner Inertial Fusion (MagLIF) experiments on Z [P. F. Schmit et al. , Phys. Rev. Lett. 113 , 155004 (2014); P. F. Knapp et al. , Phys. Plasmas, 22 , 056312 (2015)]. Finally, we present some recent developments for designing and fabricating novel micro B-dot probes to measure B z ( t ) inside of an imploding liner. In one approach, the micro B-dot loops were fabricated on a printed circuit board (PCB). The PCB was then soldered to off-the-shelf 0.020- inch-diameter semi-rigid coaxial cables, which were terminated with standard SMA connectors. These probes were recently tested using the COBRA pulsed power generator (0-1 MA in 100 ns) at Cornell University. In another approach, we are planning to use new multi-material 3D printing capabilities to fabricate novel micro B-dot packages. In the near future, we plan to 3D print these probes and then test them on the COBRA generator. With successful operation demonstrated at 1-MA, we will then make plans to use these probes on a 20-MA Z experiment.

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Exploring magnetized liner inertial fusion with a semi-analytic model

McBride, Ryan D.; Slutz, Stephen A.; Sinars, Daniel S.; Vesey, Roger A.; Gomez, Matthew R.; Sefkow, Adam B.; Hansen, Stephanie B.; Cochrane, Kyle C.; Schmit, Paul S.; Knapp, Patrick K.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Jennings, Christopher A.; Martin, Matthew; Awe, Thomas J.; Rovang, Dean C.; Lamppa, Derek C.; Peterson, Kyle J.; Rochau, G.A.; Porter, John L.; Stygar, William A.; Cuneo, M.E.

Abstract not provided.

Fusion-Neutron Measurements for Magnetized Liner Inertial Fusion Experiments on the Z Accelerator

Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, Patrick K.; Schmit, Paul S.; Harding, Eric H.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, James A.; Cuneo, M.E.; Glebov, V.Yu.; Harvey-Thompson, Adam J.; Herrmann, M.C.H.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Reneker, Joseph R.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Smith, Ian C.; Styron, Jedediah D.; Vesey, Roger A.

Abstract not provided.

X-ray Imaging of MagLIF Experiments Using a Spherically Bent Crystal Optic

Harding, Eric H.; Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Schollmeier, Marius; Peterson, Kyle J.; Awe, Thomas J.; Hansen, Stephanie B.; Hahn, Kelly D.; Knapp, Patrick K.; Schmit, Paul S.; Ruiz, Carlos L.; Sinars, Daniel S.; Jennings, Christopher A.; Smith, Ian C.; Rovang, Dean C.; Chandler, Gordon A.; Martin, Matthew; McBride, Ryan D.; Porter, John L.; Rochau, G.A.; Harding, Eric H.

Abstract not provided.

X-ray Imaging of MagLIF Experiments Using a Spherically Bent Crystal Optic

Harding, Eric H.; Gomez, Matthew R.; Slutz, Stephen A.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Schollmeier, Marius; Peterson, Kyle J.; Awe, Thomas J.; Hansen, Stephanie B.; Schmit, Paul S.; Ruiz, Carlos L.; Sinars, Daniel S.; Jennings, Christopher A.; Smith, Ian C.; Rovang, Dean C.; Chandler, Gordon A.; Martin, Matthew; McBride, Ryan D.; Porter, John L.; Rochau, G.A.

Abstract not provided.

Exploring magnetized liner inertial fusion with a semi-analytic model

McBride, Ryan D.; Slutz, Stephen A.; Sinars, Daniel S.; Vesey, Roger A.; Gomez, Matthew R.; Sefkow, Adam B.; Hansen, Stephanie B.; Cochrane, Kyle C.; Rovang, Dean C.; Lamppa, Derek C.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Schmit, Paul S.; Knapp, Patrick K.; Awe, Thomas J.; Jennings, Christopher A.; Martin, Matthew; Peterson, Kyle J.; Rochau, G.A.; Porter, John L.; Stygar, William A.; Cuneo, M.E.

Abstract not provided.

Experimental Progress in Magnetized Liner Inertial Fusion (MagLIF)

Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Peterson, Kyle J.; Hansen, Stephanie B.; Hahn, Kelly D.; Knapp, Patrick K.; Schmit, Paul S.; Ruiz, Carlos L.; Sinars, Daniel S.; Awe, Thomas J.; Harding, Eric H.; Jennings, Christopher A.; Smith, Ian C.; Rovang, Dean C.; Chandler, Gordon A.; Cuneo, M.E.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Porter, John L.; Rochau, G.A.

Abstract not provided.

Recent progress in Magnetized Liner Inertial Fusion (MagLIF) experiments

Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Geissel, Matthias G.; Harvey-Thompson, Adam J.; Peterson, Kyle J.; Awe, Thomas J.; Hansen, Stephanie B.; Harding, Eric H.; Hahn, Kelly D.; Knapp, Patrick K.; Schmit, Paul S.; Ruiz, Carlos L.; Sinars, Daniel S.; Jennings, Christopher A.; Smith, Ian C.; Rovang, Dean C.; Chandler, Gordon A.; Martin, Matthew; McBride, Ryan D.; Porter, John L.; Rochau, G.A.

Abstract not provided.

Magnetized Liner Inertial Fusion on the Z Pulsed-Power Accelerator

McBride, Ryan D.; Sinars, Daniel S.; Slutz, Stephen A.; Gomez, Matthew R.; Sefkow, Adam B.; Hansen, Stephanie B.; Awe, Thomas J.; Peterson, Kyle J.; Knapp, Patrick K.; Schmit, Paul S.; Rovang, Dean C.; Geissel, Matthias G.; Vesey, Roger A.; Harvey-Thompson, Adam J.; Jennings, Christopher A.; Martin, Matthew; Lemke, Raymond W.; Hahn, Kelly D.; Harding, Eric H.; Cuneo, M.E.; Porter, John L.; Rochau, G.A.; Stygar, William A.

Abstract not provided.

Recent Progress and Future Potential of Magnetized Liner Inertial Fusion (MagLIF)

Sandia journal manuscript; Not yet accepted for publication

Slutz, Stephen A.; Gomez, Matthew R.; Sefkow, Adam B.; Sinars, Daniel S.; Hahn, Kelly D.; Hansen, Stephanie B.; Harding, Eric H.; Knapp, Patrick K.; Schmit, Paul S.; Jennings, Christopher A.; Awe, Thomas J.; Herrmann, M.C.H.; Hess, Mark H.; Johns, Owen J.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Geissel, Matthias G.; Rovang, Dean C.; Chandler, Gordon A.; Cooper, Gary W.; Cuneo, M.E.; Harvey-Thompson, Adam J.; Peterson, Kyle J.; Porter, John L.; Robertson, Grafton K.; Rochau, G.A.; Ruiz, Carlos L.; Savage, Mark E.; Smith, Ian C.; Stygar, William A.; Vesey, Roger A.

The standard approaches to inertial confinement fusion (ICF) rely on implosion velocities greater than 300 km/s and spherical convergence to achieve the high fuel temperatures (T > 4 keV) and areal densities (ρr > 0.3 g/cm2) required for ignition1. Such high velocities are achieved by heating the outside surface of a spherical capsuleeither directly with a large number of laser beams (Direct Drive) or with x-rays generated within a hohlraum (Indirect Drive). A much more energetically efficient approach is to use the magnetic pressure generated by a pulsed power machine to directly drive an implosion. In this approach 5-10% of the stored energy can be converted to the implosion of a metal tube generally referred to as a “liner”. However, the implosion velocity is not very high 70-100 km/s and the convergence is cylindrical (rather than spherical) making it more difficult to achieve the high temperatures and areal densities needed for ignition.

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Experimental demonstration of fusion-relevant conditions in magnetized liner inertial fusion

Physical Review Letters

Gomez, Matthew R.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Chandler, Gordon A.; Cuneo, M.E.; Harvey-Thompson, Adam J.; Herrmann, Mark H.; Hess, Mark H.; Slutz, Stephen A.; Johns, Owen J.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Robertson, Grafton K.; Rochau, G.A.; Ruiz, Carlos L.; Savage, Mark E.; Sefkow, Adam B.; Smith, Ian C.; Stygar, William A.; Vesey, Roger A.; Sinars, Daniel S.; Hahn, Kelly D.; Hansen, Stephanie B.; Harding, Eric H.; Knapp, Patrick K.; Schmit, Paul S.

This Letter presents results from the first fully integrated experiments testing the magnetized liner inertial fusion concept [S.A. Slutz et al., Phys. Plasmas 17, 056303 (2010)], in which a cylinder of deuterium gas with a preimposed axial magnetic field of 10 T is heated by Z beamlet, a 2.5 kJ, 1 TW laser, and magnetically imploded by a 19 MA current with 100 ns rise time on the Z facility. Despite a predicted peak implosion velocity of only 70 km/s, the fuel reaches a stagnation temperature of approximately 3 keV, with Te ≈ Ti, and produces up to 2e12 thermonuclear DD neutrons. In this study, X-ray emission indicates a hot fuel region with full width at half maximum ranging from 60 to 120 μm over a 6 mm height and lasting approximately 2 ns. The number of secondary deuterium-tritium neutrons observed was greater than 1010, indicating significant fuel magnetization given that the estimated radial areal density of the plasma is only 2 mg/cm2.

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Demonstration of fusion relevant conditions in Magnetized Liner Inertial Fusion experiments on the Z facility

Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hahn, Kelly D.; Hansen, Stephanie B.; Harding, Eric H.; Knapp, Patrick K.; Schmit, Paul S.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Chandler, Gordon A.; Cuneo, M.E.; Harvey-Thompson, Adam J.; Herrmann, Mark H.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Rochau, G.A.; Ruiz, Carlos L.; Savage, Mark E.; Smith, Ian C.; Vesey, Roger A.

Abstract not provided.

Demonstration of fusion relevant conditions in Magnetized Liner Inertial Fusion Experiments on the Z Facility

Gomez, Matthew R.; Slutz, Stephen A.; Sefkow, Adam B.; Sinars, Daniel S.; Hahn, Kelly D.; Hansen, Stephanie B.; Harding, Eric H.; Knapp, Patrick K.; Schmit, Paul S.; Jennings, Christopher A.; Awe, Thomas J.; Geissel, Matthias G.; Rovang, Dean C.; Chandler, Gordon A.; Cuneo, M.E.; Harvey-Thompson, Adam J.; Herrmann, Mark H.; Lamppa, Derek C.; Martin, Matthew; McBride, Ryan D.; Peterson, Kyle J.; Porter, John L.; Rochau, G.A.; Ruiz, Carlos L.; Savage, Mark E.; Smith, Ian C.; Vesey, Roger A.

Abstract not provided.

Modified 3D-helix-like instability structure for imploding Z-pinch liners that are premagnetized with a uniform axial field

Awe, Thomas J.; Jennings, Christopher A.; McBride, Ryan D.; Cuneo, M.E.; Lamppa, Derek C.; Martin, Matthew; Rovang, Dean C.; Sinars, Daniel S.; Slutz, Stephen A.; Owen, Albert C.; Gomez, Matthew R.; Hansen, Stephanie B.; Harding, Eric H.; Herrmann, Mark H.; Jones, Michael J.; Knapp, Patrick K.; Mckenney, John M.; Peterson, Kyle J.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Schmit, Paul S.; Sefkow, Adam B.; Stygar, William A.; Vesey, Roger A.; Yu, Edmund Y.; Tomlinson, Kurt T.; Schroen, Diana G.

Abstract not provided.

Modified helix-like instability structure on imploding z-pinch liners that are pre-imposed with a uniform axial magnetic field

Physics of Plasmas

Awe, Thomas J.; Owen, Albert C.; Gomez, Matthew R.; Hansen, Stephanie B.; Herrmann, Mark H.; Jones, Michael J.; Mckenney, John M.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Stygar, William A.; Jennings, Christopher A.; McBride, Ryan D.; Lamppa, Derek C.; Martin, Matthew; Rovang, Dean C.; Sinars, Daniel S.; Slutz, Stephen A.; Cuneo, M.E.

Abstract not provided.

Observations of Modified Three-Dimensional Instability Structure for Imploding z -Pinch Liners that are Premagnetized with an Axial Field

Physical Review Letters

McBride, Ryan D.; Gomez, Matthew R.; Hansen, Stephanie B.; Herrmann, Mark H.; Mckenney, John M.; Robertson, Grafton K.; Rochau, G.A.; Savage, Mark E.; Stygar, William A.; Jennings, Christopher A.; Lamppa, Derek C.; Martin, Matthew; Rovang, Dean C.; Slutz, Stephen A.; Cuneo, M.E.; Owen, Albert C.; Sinars, Daniel S.

Novel experimental data are reported that reveal helical instability formation on imploding z -pinch liners that are premagnetized with an axial field. Such instabilities differ dramatically from the mostly azimuthally symmetric instabilities that form on unmagnetized liners. The helical structure persists at nearly constant pitch as the liner implodes. This is surprising since, at the liner surface, the azimuthal drive field presumably dwarfs the axial field for all but the earliest stages of the experiment. These fundamentally 3D results provide a unique and challenging test for 3D-magnetohydrodynamics simulations.

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An experimental platform for generating Richtmyer-Meshkov instabilities on Z

Martin, Matthew

The Richtmyer-Meshkov (RM) instability results when a shock wave crosses a rippled interface between two different materials. The shock deposited vorticity causes the ripples to grow into long spikes. Ultimately this process encourages mixing in many warm dense matter and plasma flows of interest. However, generating pure RM instabilities from initially solid targets is difficult because longlived, steady shocks are required. As a result only a few relevant experiments exist, and current theoretical understanding is limited. Here we propose using a flyer-plate driven target to generate RM instabilities with the Z machine. The target consists of a Be impact layer with sinusoidal perturbations and is followed by a low-density carbon foam. Simulation results show that the RM instability grows for 60 ns before release waves reach the perturbation. This long drive time makes Z uniquely suited for generating the high-quality data that is needed by the community.

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Pulsed-power driven inertial confinement fusion development at Sandia National Laboratories

Proposed for publication in 5th Special Issue of the IEEE Transactions on Plasma Science Z-Pinch Plasmas.

Cuneo, M.E.; Mazarakis, Michael G.; Lamppa, Derek C.; Kaye, Ronald J.; Nakhleh, Charles N.; Bailey, James E.; Hansen, Stephanie B.; McBride, Ryan D.; Herrmann, Mark H.; Lopez, A.; Peterson, Kyle J.; Ampleford, David A.; Jones, Michael J.; Savage, Mark E.; Jennings, Christopher A.; Martin, Matthew; Slutz, Stephen A.; Lemke, Raymond W.; Christenson, Peggy J.; Sweeney, Mary A.; Jones, Brent M.; Yu, Edmund Y.; McPherson, Leroy A.; Harding, Eric H.; Knapp, Patrick K.; Gomez, Matthew R.; Awe, Thomas J.; Stygar, William A.; Leeper, Ramon J.; Ruiz, Carlos L.; Chandler, Gordon A.; Mckenney, John M.; Owen, Albert C.; McKee, George R.; Matzen, M.K.; Leifeste, Gordon T.; Atherton, B.W.; Vesey, Roger A.; Smith, Ian C.; Geissel, Matthias G.; Rambo, Patrick K.; Sinars, Daniel S.; Sefkow, Adam B.; Rovang, Dean C.; Rochau, G.A.

Abstract not provided.

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.

Beryllium liner z-pinches for Magneto-Rayleigh--Taylor studies on Z

McBride, Ryan D.; Slutz, Stephen A.; Jennings, Christopher A.; Sinars, Daniel S.; Lemke, Raymond W.; Martin, Matthew; Vesey, Roger A.; Cuneo, M.E.; Herrmann, Mark H.

Magnetic Liner Inertial Fusion (MagLIF) [S. A. Slutz, et al., Phys. Plasmas 17 056303 (2010)] is a promising new concept for achieving >100 kJ of fusion yield on Z. The greatest threat to this concept is the Magneto-Rayleigh-Taylor (MRT) instability. Thus an experimental campaign has been initiated to study MRT growth in fast-imploding (<100 ns) cylindrical liners. The first sets of experiments studied aluminum liner implosions with prescribed sinusoidal perturbations (see talk by D. Sinars). By contrast, this poster presents results from the latest sets of experiments that used unperturbed beryllium (Be) liners. The purpose for using Be is that we are able to radiograph 'through' the liner using the 6-keV photons produced by the Z-Beamlet backlighting system. This has enabled us to obtain time-resolved measurements of the imploding liner's density as a function of both axial and radial location throughout the field of view. This data is allowing us to evaluate the integrity of the inside (fuel-confining) surface of the imploding liner as it approaches stagnation.

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Design of a flyer-plate-driven hydrodynamic instability experiment for Z

Harding, Eric H.; Martin, Matthew; Cuneo, M.E.

We present the preliminary design of a Z experiment intended to observe the growth of several hydrodynamic instabilities (RT, RM, and KH) in a high-energy-density plasma. These experiments rely on the Z-machine's unique ability to launch cm-sized slabs of cold material (known as flyer plates) to velocities of several times 10 km/s. During the proposed experiment, the flyer plate will impact a cm-sized target with an embedded interface that has a prescribed sinusoidal perturbation. The flyer plate will generate a strong shock that propagates into the target and later initiates unstable growth of the perturbation. The goal of the experiment is to observe the perturbation at various stages of its evolution as it transitions from linear to non-linear growth, and finally to a fully turbulent state.

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86 Results
86 Results