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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.

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TYPE Presentation YEAR 2016

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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.

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TYPE Conference Poster YEAR 2016

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Fusion-neutron measurements for magnetized liner inertial fusion experiments on the Z accelerator

Journal of Physics: Conference Series

Hahn, K.D.; Chandler, Gordon A.; Ruiz, Carlos L.; Cooper, Gary W.; Gomez, Matthew R.; Slutz, S.; Sefkow, Adam B.; Sinars, Daniel S.; Hansen, Stephanie B.; Knapp, P.F.; Schmit, Paul S.; Harding, Eric H.; Jennings, C.A.; Awe, T.J.; Geissel, Matthias G.; Rovang, Dean C.; Torres, Jose A.; Bur, J.A.; Cuneo, M.E.; Glebov, V.Y.; Harvey-Thompson, Adam J.; Herrman, M.C.; Hess, Mark H.; Johns, Owen J.; Jones, Brent M.; Lamppa, Derek C.; Lash, Joel S.; Martin, M.R.; 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.

Several magnetized liner inertial fusion (MagLIF) experiments have been conducted on the Z accelerator at Sandia National Laboratories since late 2013. Measurements of the primary DD (2.45 MeV) neutrons for these experiments suggest that the neutron production is thermonuclear. Primary DD yields up to 3e12 with ion temperatures ∼2-3 keV have been achieved. Measurements of the secondary DT (14 MeV) neutrons indicate that the fuel is significantly magnetized. Measurements of down-scattered neutrons from the beryllium liner suggest ρRliner∼1g/cm2. Neutron bang times, estimated from neutron time-of-flight (nTOF) measurements, coincide with peak x-ray production. Plans to improve and expand the Z neutron diagnostic suite include neutron burn-history diagnostics, increased sensitivity and higher precision nTOF detectors, and neutron recoil-based yield and spectral measurements.

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TYPE Journal Article YEAR 2016

Scopus OSTI DOI

Demonstration of space-resolved x-ray Thomson scattering capability for warm dense matter experiments on the Z accelerator

High Energy Density Physics

Ao, Tommy A.; Harding, Eric H.; Bailey, James E.; Lemke, Raymond W.; Desjarlais, Michael P.; Hansen, Stephanie B.; Smith, Ian C.; Geissel, Matthias G.; Maurer, A.; Reneker, Joseph R.; Romero, D.; Sinars, Daniel S.; Rochau, G.A.; Benage, John F.

Experiments on the Sandia Z pulsed-power accelerator have demonstrated the ability to produce warm dense matter (WDM) states with unprecedented uniformity, duration, and size, which are ideal for investigations of fundamental WDM properties. For the first time, space-resolved x-ray Thomson scattering (XRTS) spectra from shocked carbon foams were recorded on Z. The large (>20 MA) electrical current produced by Z was used to launch Al flyer plates up to 25 km/s. The impact of the flyer plate on a CH2 foam target produced a shocked state with an estimated pressure of 0.75 Mbar, density of 0.52 g/cm3, and temperature of 4.3 eV. Both unshocked and shocked portions of the foam target were probed with 6.2 keV x-rays produced by focusing the Z-Beamlet laser onto a nearby Mn foil. The data are composed of three spatially distinct spectra that were simultaneously captured with a single spectrometer with high spectral (4.8 eV) and spatial (190 μm) resolutions. Detailed spectral information from three target locations is provided simultaneously: the incident x-ray source, the scattered signal from unshocked foam, and the scattered signal from shocked foam.

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TYPE Journal Article YEAR 2016

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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.

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TYPE Conference Poster YEAR 2015

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Investigating the Effects of Adding a Center jet to Argon gas puff implosions at the Z facility

Harvey-Thompson, Adam J.; Jennings, Christopher A.; Jones, Brent M.; Ampleford, David A.; Hansen, Stephanie B.; Lamppa, Derek C.; Cuneo, M.E.; Reneker, Joseph R.; Johnson, Drew J.; Jones, Michael J.; Moore, Nathan W.; Flanagan, Timothy M.; Mckenney, John M.; Rochau, G.A.; Waisman, Eduardo M.; Coverdale, Christine A.; Apruzese, J.P.A.; Thornhill, J.W.T.; Giuliani, J.L.G.

Abstract not provided.

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TYPE Conference Poster YEAR 2015

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X-ray Thomson scattering of shocked carbon foams on the Z accelerator

Ao, Tommy A.; Harding, Eric H.; Bailey, James E.; Lemke, Raymond W.; Desjarlais, Michael P.; Hansen, Stephanie B.; Smith, Ian C.; Reneker, Joseph R.; Romero, Dustin H.; Sinars, Daniel S.; Rochau, G.A.; Benage, John F.

Abstract not provided.

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TYPE Conference Poster YEAR 2015

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Computational modeling of Krypton gas puffs with tailored mass density profiles on Z

Physics of Plasmas

Jennings, C.A.; Ampleford, David A.; Lamppa, Derek C.; Hansen, Stephanie B.; Jones, Brent M.; Harvey-Thompson, Adam J.; Jobe, M.; Strizic, T.; Reneker, Joseph R.; Rochau, G.A.; Cuneo, M.E.

Large diameter multi-shell gas puffs rapidly imploded by high current (∼20 MA, ∼100ns) on the Z generator of Sandia National Laboratories are able to produce high-intensity Krypton K-shell emission at ∼13keV. Efficiently radiating at these high photon energies is a significant challenge which requires the careful design and optimization of the gas distribution. To facilitate this, we hydrodynamically model the gas flow out of the nozzle and then model its implosion using a 3-dimensional resistive, radiative MHD code (GORGON). This approach enables us to iterate between modeling the implosion and gas flow from the nozzle to optimize radiative output from this combined system. Guided by our implosion calculations, we have designed gas profiles that help mitigate disruption from Magneto-Rayleigh-Taylor implosion instabilities, while preserving sufficient kinetic energy to thermalize to the high temperatures required for K-shell emission.

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TYPE Journal Article YEAR 2015

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