Publications

Gomez, Matthew R.; Yager-Elorriaga, David A.; Myers, Clayton E.; Slutz, Stephen A.; Weis, Matthew R.; Jennings, Christopher A.; Lamppa, Derek C.; Harvey-Thompson, Adam J.; Geissel, Matthias G.; Knapp, Patrick K.; Harding, Eric H.; Hansen, Stephanie B.; Mangan, Michael M.; Ruiz, Carlos L.; Chandler, Gordon A.; Hahn, Kelly D.; Webb, Timothy J.; Moore, Thomas M.; Laity, George R.; Ampleford, David A.; Peterson, Kyle J.; Rochau, G.A.; Sinars, Daniel S.

Abstract not provided.

Physics of Plasmas

Harvey-Thompson, Adam J.; Geissel, Matthias G.; Jennings, C.A.; Weis, M.R.; Gomez, M.R.; Fein, Jeffrey R.; Ampleford, David A.; Chandler, Gordon A.; Glinsky, Michael E.; Hahn, K.D.; Hansen, Stephanie B.; Harding, Eric H.; Knapp, P.F.; Paguio, R.R.; Perea, L.; Peterson, Kyle J.; Porter, John L.; Rambo, Patrick K.; Robertson, Grafton K.; Rochau, G.A.; Ruiz, C.L.; Schwarz, Jens S.; Shores, J.E.; Sinars, Daniel S.; Slutz, S.A.; Smith, Ian C.; Smith, Ian C.; Speas, C.S.; Whittemore, K.; Woodbury, D.

A multi-frame shadowgraphy diagnostic has been developed and applied to laser preheat experiments relevant to the Magnetized Liner Inertial Fusion (MagLIF) concept. The diagnostic views the plasma created by laser preheat in MagLIF-relevant gas cells immediately after the laser deposits energy as well as the resulting blast wave evolution later in time. The expansion of the blast wave is modeled with 1D radiation-hydrodynamic simulations that relate the boundary of the blast wave at a given time to the energy deposited into the fuel. This technique is applied to four different preheat protocols that have been used in integrated MagLIF experiments to infer the amount of energy deposited by the laser into the fuel. The results of the integrated MagLIF experiments are compared with those of two-dimensional LASNEX simulations. The best performing shots returned neutron yields ∼40-55% of the simulated predictions for three different preheat protocols.

Vaughan, Jeremy V.; Ruiz, Carlos L.; May, Mark J.; Silano, Jack S.; Ampleford, David A.; Lahmann, Brandon L.; Cooper, Gary W.; Chandler, Gordon A.; Mangan, Michael M.; Styron, Jedediah D.; McWatters, Bruce R.; Torres, Jose A.; Highstrete, Clark H.

Abstract not provided.

Ruiz, Carlos L.; Fehl, D.L.; Chandler, Gordon A.; Cooper, Gary W.; Jones, Brent M.; Styron, Jedediah D.; Torres, Jose A.

Abstract not provided.

Physics of Plasmas

Harvey-Thompson, Adam J.; Weis, M.R.; Harding, Eric H.; Geissel, Matthias G.; Ampleford, David A.; Chandler, Gordon A.; Fein, Jeffrey R.; Glinsky, Michael E.; Gomez, Matthew R.; Hahn, K.D.; Hansen, Stephanie B.; Jennings, C.A.; Knapp, P.F.; Paguio, R.R.; Perea, L.; Peterson, Kyle J.; Porter, John L.; Rambo, Patrick K.; Robertson, Grafton K.; Rochau, G.A.; Ruiz, D.E.; Schwarz, Jens S.; Shores, J.E.; Sinars, Daniel S.; Slutz, S.A.; Smith, G.E.; Smith, Ian C.; Speas, C.S.; Whittemore, K.

A series of Magnetized Liner Inertial Fusion (MagLIF) experiments have been conducted in order to investigate the mix introduced from various target surfaces during the laser preheat stage. The material mixing was measured spectroscopically for a variety of preheat protocols by employing mid-atomic number surface coatings applied to different regions of the MagLIF target. The data show that the material from the top cushion region of the target can be mixed into the fuel during preheat. For some preheat protocols, our experiments show that the laser-entrance-hole (LEH) foil used to contain the fuel can be transported into the fuel a significant fraction of the stagnation length and degrade the target performance. Preheat protocols using pulse shapes of a few-ns duration result in the observable LEH foil mix both with and without phase-plate beam smoothing. In order to reduce this material mixing, a new capability was developed to allow for a low energy (∼20 J) laser pre-pulse to be delivered early in time (-20 ns) before the main laser pulse (∼1.5 kJ). In experiments, this preheat protocol showed no indications of the LEH foil mix. The experimental results are broadly in agreement with pre-shot two-dimensional HYDRA simulations that helped motivate the development of the early pre-pulse capability.

Physics of Plasmas

Slutz, S.A.; Gomez, Matthew R.; Hansen, Stephanie B.; Harding, Eric H.; Hutsel, Brian T.; Knapp, P.F.; Lamppa, Derek C.; Awe, T.J.; Ampleford, David A.; Bliss, David E.; Chandler, Gordon A.; Cuneo, M.E.; Geissel, Matthias G.; Glinsky, Michael E.; Harvey-Thompson, Adam J.; Hess, Mark H.; Jennings, C.A.; Jones, Brent M.; Laity, G.R.; Martin, M.R.; Peterson, Kyle J.; Porter, John L.; Rambo, Patrick K.; Rochau, G.A.; Ruiz, Carlos L.; Savage, Mark E.; Schwarz, Jens S.; Schmit, Paul S.; Shipley, Gabriel A.; Sinars, Daniel S.; Smith, Ian C.; Vesey, Roger A.; Weis, M.R.

The Magnetized Liner Inertial Fusion concept (MagLIF) [Slutz et al., Phys. Plasmas 17, 056303 (2010)] is being studied on the Z facility at Sandia National Laboratories. Neutron yields greater than 1012 have been achieved with a drive current in the range of 17-18 MA and pure deuterium fuel [Gomez et al., Phys. Rev. Lett. 113, 155003 (2014)]. We show that 2D simulated yields are about twice the best yields obtained on Z and that a likely cause of this difference is the mix of material into the fuel. Mitigation strategies are presented. Previous numerical studies indicate that much larger yields (10-1000 MJ) should be possible with pulsed power machines producing larger drive currents (45-60 MA) than can be produced by the Z machine [Slutz et al., Phys. Plasmas 23, 022702 (2016)]. To test the accuracy of these 2D simulations, we present modifications to MagLIF experiments using the existing Z facility, for which 2D simulations predict a 100-fold enhancement of MagLIF fusion yields and considerable increases in burn temperatures. Experimental verification of these predictions would increase the credibility of predictions at higher drive currents.

Review of Scientific Instruments

Vaughan, Jeremy V.; Ruiz, Carlos L.; Fittinghoff, D.; May, M.J.; Ampleford, David A.; Cooper, Gary W.; Chandler, Gordon A.; Hahn, K.; Styron, Jedediah D.; McWatters, B.R.; Torres, Jose A.; Maurer, A.J.; Jones, Brent M.

The one-dimensional imager of neutrons (ODIN) at the Sandia Z facility consists of a 10-cm block of tungsten with rolled edges, creating a slit imager with slit widths of either 250, 500, or 750 μm. Designed with a 1-m neutron imaging line of sight, we achieve about 4:1 magnification and 500-μm axial spatial resolution. The baseline inertial confinement fusion concept at Sandia is magnetized liner inertial fusion, which nominally creates a 1-cm line source of neutrons. ODIN was designed to determine the size, shape, and location of the neutron producing region, furthering the understanding of compression quality along the cylindrical axis of magnetized liner implosions. Challenges include discriminating neutrons from hard x-rays and gammas with adequate signal-to-noise in the 2 × 1012 deuterium-deuterium (DD) neutron yield range, as well as understanding the point spread function of the imager to various imaging detectors (namely, CR-39). Modeling efforts were conducted with MCNP6.1 to determine neutron response functions for varying configurations in a clean DD neutron environment (without x-rays or gammas). Configuration alterations that will be shown include rolled-edge slit orientation and slit width, affecting the resolution and response function. Finally, the experiment to determine CR-39 neutron sensitivity, with and without a high density polyethylene (n, p) converter, an edge spread function, and resolution will be discussed.

Vaughan, Jeremy V.; Ruiz, Carlos L.; Fittinghoff, D.F.; May, M.J.M.; Ampleford, David A.; Cooper, Gary W.; Chandler, Gordon A.; Hahn, Kelly D.; Styron, Jedediah D.; McWatters, Bruce R.; Torres, Jose A.; Maurer, A.; Jones, Brent M.

Abstract not provided.

Ampleford, David A.; Alberto, Perry J.; Ball, Christopher R.; Chandler, Gordon A.; Fisher, John A.; Hahn, Kelly D.; Jennings, Christopher A.; Jones, Brent M.; Torres, Jose A.; Vaughan, Jeremy V.; Fittinghoff, D.F.; May, M.J.M.; Gatu-Johnson, M.G.; Lahmann, B.L.

Abstract not provided.

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.

Hahn, Kelly D.; Chandler, Gordon A.; Schmit, Paul S.; Knapp, Patrick K.; Hansen, Stephanie B.; Harding, Eric H.; Ruiz, Carlos L.; Cooper, Gary W.; Jones, Brent M.; Styron, Jedediah S.; Torres, Jose A.; Alberto, Perry J.

Abstract not provided.

Styron, Jedediah S.; Cooper, Gary W.; Vaughan, Jeremy V.; Weaver, Colin A.; Ruiz, Carlos L.; Hahn, Kelly D.; Chandler, Gordon A.; Jones, Brent M.; McWatters, Bruce R.; Torres, Jose A.; Alberto, Perry J.; Smith, Jenny R.

Abstract not provided.

Chandler, Gordon A.; Hahn, Kelly D.; Ruiz, Carlos L.; Jones, Brent M.; Alberto, Perry J.; Torres, Jose A.; Gomez, Matthew R.; Harding, Eric H.; Harvey-Thompson, Adam J.; Hess, Mark H.; Knapp, Patrick K.; Cooper, Gary C.; Styron, Jedediah S.; Moy, Ken M.; Mckenna, Ian M.; Glebov, Vladimir Y.; Fittinghoff, David N.; May, Mark J.; Snyder, Lucas S.; Bowers, Dan B.

Abstract not provided.

Hahn, Kelly D.; Styron, Jedediah D.; Chandler, Gordon A.; Cooper, Gary W.; Alberto, Perry J.; Forrest, Chad F.; Glebov, V.Yu.; Jones, Brent M.; McWatters, Bruce R.; Nelson, Alan J.; Smith, Jenny R.; Torres, Jose A.; Vaughan, Jeremy V.; Weaver, Colin A.

Abstract not provided.

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.

Hahn, Kelly D.; Chandler, Gordon A.; Knapp, Patrick K.; Ruiz, Carlos L.; Cooper, Gary W.; Alberto, Perry J.; Jones, Brent M.; Price, Nathan P.; Styron, Jedediah D.; Torres, Jose A.

Abstract not provided.

Hahn, Kelly D.; Hahn, Kelly D.; Chandler, Gordon A.; Schmit, Paul S.; Knapp, Patrick K.; Hansen, Stephanie B.; Harding, Eric H.; Ruiz, Carlos L.; Jones, Brent M.; Gomez, Matthew R.; Ampleford, David A.; Torres, Jose A.; Alberto, Perry J.; Cooper, Gary W.; Styron, Jedediah D.

Abstract not provided.

Ruiz, Carlos L.; Alberto, Perry J.; Torres, Jose A.; Hahn, Kelly D.; Ampleford, David A.; Ball, Christopher R.; Chandler, Gordon A.; Fisher, John A.; Jones, Brent M.; Fittinghoff, David N.; Johnson, Maria G.; Lahmann, Brandon L.

Abstract not provided.

Hahn, Kelly D.; Ruiz, Carlos L.; Chandler, Gordon A.; Cooper, Gary W.; Jones, Brent M.; Torres, Jose A.; Alberto, Perry J.; Norris, Edward T.; Styron, Jedediah D.; Glebov, Vladimir Y.; Moy, Ken M.; Buckles, Rob B.

Abstract not provided.

Ruiz, Carlos L.; Fittinghoff, David N.; Ampleford, David A.; Ball, Chris B.; Fisher, John A.; Alberto, Perry J.; Torres, Jose A.; Jones, Brent M.; Hahn, Kelly D.; Chandler, Gordon A.

Abstract not provided.

Gomez, Matthew R.; Harding, Eric H.; Peterson, Kyle J.; Awe, Thomas J.; Ampleford, David A.; Hansen, Stephanie B.; Jennings, Christopher A.; Weis, Matthew R.; Chandler, Gordon A.; Hahn, Kelly D.; Knapp, Patrick K.; Martin, Matthew; McBride, Ryan D.; Rochau, G.A.; Sefkow, Adam B.; Sinars, Daniel S.; Yu, Edmund Y.

Abstract not provided.

Hahn, Kelly D.; Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Carlos L.; Jones, Brent M.; Gomez, Matthew R.; Knapp, Patrick K.; Sefkow, Adam B.; Hansen, Stephanie B.; Schmit, Paul S.; Harding, Eric H.; Norris, Edward T.; Torres, Jose A.; Cooper, Gary W.; Styron, Jedediah D.; Glebov, V.Yu.; Frenje, J.A.; Lahmann, B.L.; Gatu-Johnson, M.G.; Seguin, F.H.; Petrasso, R.D.; Fittinghoff, D.F.; May, M.M.; Snyder, L.S.; Moy, K.M.; Buckles, R.B.

Abstract not provided.

Norris, Edward T.; Hahn, Kelly D.; Chandler, Gordon A.; Ruiz, Candace C.; Styron, Jedediah D.; Cooper, Gary W.; Jones, Brent M.; Torres, Jose A.; Spencer, Decker C.; Nelson, Alan J.

Abstract not provided.

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.

Hahn, Kelly D.; Ruiz, Carlos L.; Chandler, Gordon A.; Cooper, Gary W.; Jones, Brent M.; Knapp, Patrick K.; Torres, Jose A.; Bur, James A.

Abstract not provided.