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Pulsed-coil magnet systems for applying 10-30 Tesla Fields to cm-scale targets on Sandia's Z facility

Review of Scientific Instruments

Rovang, Dean C.; Lamppa, Derek C.; Cuneo, Michael E.; Owen, Albert C.; Mckenney, John; Johnson, Drew; Radovich, Shawn; Kaye, Ronald J.; Mcbride, Ryan; Alexander, Charles S.; Awe, Thomas J.; Slutz, Stephen A.; Sefkow, Adam B.; Haill, Thomas A.; Jones, Peter; Argo, Jeffrey W.; Dalton, Devon; Robertson, G.K.; Waisman, Eduardo M.; Sinars, Daniel; Meissner, Joel; Milhous, Mark; Nguyen, Doan; Mielke, Chuck

We have successfully integrated the capability to apply uniform, high magnetic fields (10–30 T) to high energy density experiments on the Z facility. This system uses an 8-mF, 15-kV capacitor bank to drive large-bore (5 cm diameter), high-inductance (1–3 mH) multi-turn, multi-layer electromagnets that slowly magnetize the conductive targets used on Z over several milliseconds (time to peak field of 2–7 ms). This system was commissioned in February 2013 and has been used successfully to magnetize more than 30 experiments up to 10 T that have produced exciting and surprising physics results. These experiments used split-magnet topologies to maintain diagnostic lines of sight to the target. We then describe the design, integration, and operation of the pulsed coil system into the challenging and harsh environment of the Z Machine. We also describe our plans and designs for achieving fields up to 20 T with a reduced-gap split-magnet configuration, and up to 30 T with a solid magnet configuration in pursuit of the Magnetized Liner Inertial Fusion concept.

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TYPE Journal Article YEAR 2014

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THREE DIMENSIONAL MODELING OF MAGLIF LOADS ON THE Z GENERATOR USING THE GORGON MHD CODE

Jennings, Christopher A.; Gomez, Matthew R.; Hansen, Stephanie B.; Harding, Eric H.; Mcbride, Ryan; Sinars, Daniel; Awe, Thomas J.; Slutz, Stephen A.; Sefkow, Adam B.; Peterson, K.J.; Chittenden, J.P.

Abstract not provided.

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TYPE Presentation YEAR 2014

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Adaptive Beam Smoothing with Plasma-Pinholes for Laser-Entrance-Hole Transmission Studies

Geissel, Matthias; Awe, Thomas J.; Campbell, Edward M.; Gomez, Matthew R.; Harding, Eric H.; Harvey-Thompson, Adam J.; Jennings, Christopher A.; Kimmel, Mark; Lewis, Sean M.; Mcbride, Ryan; Peterson, K.J.; Schollmeier, Marius; Sefkow, Adam B.; Shores, Jonathon; Sinars, Daniel; Slutz, Stephen A.; Smith, Ian C.; Speas, Christopher S.; Stahoviak, John W.; Porter, John L.

Abstract not provided.

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TYPE Conference Poster YEAR 2014

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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; Rovang, Dean C.; Chandler, Gordon A.; Cuneo, Michael E.; Harvey-Thompson, Adam J.; Herrmann, Mark H.; Hess, Mark H.; Slutz, Stephen A.; Johns, Owen; Lamppa, Derek C.; Martin, Matthew R.; Mcbride, Ryan; Peterson, K.J.; Robertson, G.K.; Rochau, G.A.; Ruiz, Carlos L.; Savage, Mark E.; Sefkow, Adam B.; Smith, Ian C.; Stygar, William A.; Vesey, Roger A.; Sinars, Daniel; Hahn, Kelly; Hansen, Stephanie B.; Harding, Eric H.; Knapp, P.F.; Schmit, Paul

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 T_e ≈ T_i, 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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TYPE Journal Article YEAR 2014

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