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Progress in Preconditioning MagLIF fuel and its Impact on Performance

Peterson, Kyle J.; Harvey-Thompson, Adam J.; Awe, Thomas J.; Bliss, David E.; Geissel, Matthias G.; Glinsky, Michael E.; Gomez, Matthew R.; Harding, Eric H.; Hansen, Stephanie B.; Jennings, Christopher A.; Kimmel, Mark W.; Knapp, Patrick K.; Lewis, Sean M.; Schollmeier, Marius; Schwarz, Jens S.; Sefkow, Adam B.; Shores, Jonathon S.; Slutz, Stephen A.; Sinars, Daniel S.; Smith, Ian C.; Speas, Christopher S.; Vesey, Roger A.; Weis, Matthew R.; Porter, John L.

Abstract not provided.

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TYPE Presentation YEAR 2017
OSTI

Detection of an anomalous pressure on a magneto-inertial-fusion load current diagnostic

Physics of Plasmas

Hess, Mark H.; Hutsel, Brian T.; Jennings, Christopher A.; Vandevender, J.P.; Sefkow, Adam B.; Gomez, Matthew R.; Knapp, Patrick K.; Laity, George R.; Laros, James H.; Lamppa, Derek C.; Peterson, Kyle J.; Stygar, William A.; Sinars, Daniel S.

Recent Magnetized Liner Inertial Fusion experiments at the Sandia National Laboratories Z pulsed power facility have featured a PDV (Photonic Doppler Velocimetry) diagnostic in the final power feed section for measuring load current. In this paper, we report on an anomalous pressure that is detected on this PDV diagnostic very early in time during the current ramp. Early time load currents that are greater than both B-dot upstream current measurements and existing Z machine circuit models by at least 1 MA would be necessary to describe the measured early time velocity of the PDV flyer. This leads us to infer that the pressure producing the early time PDV flyer motion cannot be attributed to the magnetic pressure of the load current but rather to an anomalous pressure. Using the MHD code ALEGRA, we are able to compute a time-dependent anomalous pressure function, which when added to the magnetic pressure of the load current, yields simulated flyer velocities that are in excellent agreement with the PDV measurement. We also provide plausible explanations for what could be the origin of the anomalous pressure.

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TYPE Journal Article YEAR 2017
DOIOSTIScopusDOIOSTIScopus

Developing a Pre-Heat Platform for MagLIF with Z-Beamlet

Geissel, Matthias G.; Awe, Thomas J.; Bliss, David E.; Campbell, Edward M.; Gomez, Matthew R.; Glinsky, Michael E.; Harding, Eric H.; Harvey-Thompson, Adam J.; Hansen, Stephanie B.; Jennings, Christopher A.; Kimmel, Mark W.; Knapp, Patrick K.; Lewis, Sean M.; Peterson, Kyle J.; Schollmeier, Marius; Schwarz, Jens S.; Sefkow, Adam B.; Shores, Jonathon S.; Sinars, Daniel S.; Slutz, Stephen A.; Smith, Ian C.; Speas, Christopher S.; Vesey, Roger A.; Porter, John L.; Rochau, G.A.

Abstract not provided.

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TYPE Conference Poster YEAR 2016
OSTIOSTI

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.Y.; 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
OSTI

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.Y.; 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
OSTI

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

Journal of Physics: Conference Series

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.Y.; Harvey-Thompson, Adam J.; Herrman, M.C.; 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.

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
DOIOSTIScopus

SBS Measurements for Sandia's MagLIF Program

Geissel, Matthias G.; Awe, Thomas J.; Bliss, David E.; Campbell, Edward M.; Glinsky, Michael E.; Gomez, Matthew R.; Harding, Eric H.; Harvey-Thompson, Adam J.; Kimmel, Mark W.; Knapp, Patrick K.; Peterson, Kyle J.; Jennings, Christopher A.; Sefkow, Adam B.; Shores, Jonathon S.; Sinars, Daniel S.; Slutz, Stephen A.; Smith, Ian C.; Speas, Christopher S.; Weis, Matthew R.; Porter, John L.

Abstract not provided.

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TYPE Conference Poster YEAR 2016
OSTI

Nonlinear Laser-Plasma Interaction in Magnetized Liner Inertial Fusion

Proceedings of SPIE - The International Society for Optical Engineering

Geissel, Matthias G.; Awe, Thomas J.; Bliss, David E.; Campbell, Edward M.; Gomez, Matthew R.; Harding, Eric H.; Harvey-Thompson, Adam J.; Hansen, Stephanie B.; Jennings, Christopher A.; Kimmel, Mark W.; Knapp, Patrick K.; Lewis, Sean M.; McBride, Ryan D.; Peterson, Kyle J.; Schollmeier, Marius; Scoglietti, Daniel S.; Sefkow, Adam B.; Shores, Jonathon S.; Sinars, Daniel S.; Slutz, Stephen A.; Smith, Ian C.; Speas, Christopher S.; Vesey, Roger A.; Porter, John L.

Sandia National Laboratories is pursuing a variation of Magneto-Inertial Fusion called Magnetized Liner Inertial Fusion, or MagLIF. The MagLIF approach requires magnetization of the deuterium fuel, which is accomplished by an initial external B-Field and laser-driven pre-heat. Although magnetization is crucial to the concept, it is challenging to couple sufficient energy to the fuel, since laser-plasma instabilities exist, and a compromise between laser spot size, laser entrance window thickness, and fuel density must be found. Ultimately, nonlinear processes in laser plasma interaction, or laser-plasma instabilities (LPI), complicate the deposition of laser energy by enhanced absorption, backscatter, filamentation and beam-spray. We determine and discuss key LPI processes and mitigation methods. Results with and without improvement measures are presented.

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TYPE Journal Article YEAR 2016
DOIOSTI

Experimental Demonstration of the Stabilizing Effect of Dielectric Coatings on Magnetically Accelerated Imploding Metallic Liners

Physical Review Letters

Awe, Thomas J.; Peterson, Kyle J.; Yu, Edmund Y.; McBride, Ryan D.; Sinars, Daniel S.; Gomez, Matthew R.; Jennings, Christopher A.; Martin, Matthew; Rosenthal, Stephen E.; Sefkow, Adam B.; Slutz, Stephen A.; Vesey, Roger A.; Schroen, D.G.; Tomlinson, K.

Enhanced implosion stability has been experimentally demonstrated for magnetically accelerated liners that are coated with 70 μm of dielectric. The dielectric tamps liner-mass redistribution from electrothermal instabilities and also buffers coupling of the drive magnetic field to the magneto-Rayleigh-Taylor instability. A dielectric-coated and axially premagnetized beryllium liner was radiographed at a convergence ratio [CR=Rin,0/Rin(z,t)] of 20, which is the highest CR ever directly observed for a strengthless magnetically driven liner. The inner-wall radius Rin(z,t) displayed unprecedented uniformity, varying from 95 to 130 μm over the 4.0 mm axial height captured by the radiograph.

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TYPE Journal Article YEAR 2016
DOIOSTIScopus
Results 76–100 of 198
Results 76–100 of 198