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Digest of Technical Papers-IEEE International Pulsed Power Conference
Joseph, Nathan R.; Savage, Mark E. ; Stephens, Jacob C. ; Lott, John A. ; Lewis, B.A. ; Thomas, Rayburn D. ; Torres, Matthew T. ; Holman, Edward G.
The Sandia National Laboratories SPHINX accelerator is used to study the response of electronics to pulsed x-ray and electron environments. The system consists of a Marx generator and an oil-insulated pulse-forming line with self-closing oil switches. SPHINX has a peak load voltage of 2 MV and an adjustable pulse width ranging from 3 to 10 ns. The previous pulsed-power system had reliability and triggering issues with the Marx generator and subsequent undesired variations in voltage output. SPHINX was upgraded to a new Marx-generator system that has solved many of the voltage-output fluctuation and timing issues. The new Marx generator uses recently developed low-inductance 100-kV capacitors and 200-kV spark-gap switches. This paper provides an overview of SPHINX while capturing in detail the design, characterization, and comparative performance of the new Marx generator.
Struve, Kenneth W. ; Thomas, Rayburn D. ; Joseph, Nathan R. ; Harper-Slaboszewicz, V.H.
Oliver, Bryan V. ; Thomas, Rayburn D.
Digest of Technical Papers-IEEE International Pulsed Power Conference
VanDevender, J.P.; Seidel, David B. ; Mikkelson, Kenneth A. ; Thomas, Rayburn D. ; Peyton, B.P.; Harper-Slaboszewicz, V.H. ; McBride, Ryan D. ; Cuneo, M.E. ; Schneider, Larry X.
A newly invented, multi-megampere inverse diode converts the currents in many electron beams to current in a single Magnetically Insulated Transmission Line (MITL) for driving a common load. Electrons are injected through a transparent anode, cross a vacuum gap, and are absorbed in the cathode of the inverse diode. The cathode current returns to the anode through a load and generates electric and magnetic fields in the anode-cathode gap. Counter streaming electron flow is prevented by self-magnetic insulation in most of the inverse diode and by self-electrostatic insulation where the magnetic field is insufficient. Two-dimensional simulations with a 40 MA, 4 MeV, 40 ns electron beam at 3.5 kA/cm 2 current density, 5 degree beam divergence, and up to 60 degree injection angle show 85% of the injected electron beam current is captured and fed into the MITL. Exploratory experiments with a 2.5 MA, 2.8 MeV, 40 ns electron beam at 2 kA/cm 2at injection normal to the anode gave 70+/-10% collection efficiency in an unoptimized inverse diode. The inverse diode appears to have the potential of coupling multiple pulsed power modules into a common load at rates of change of current ∼1.6× 10 15 A/s required for a fusion energy device called the Plasma Power Station with a Quasi Spherical Direct Drive fusion target. © 2011 IEEE.
Slutz, Stephen A. ; Sefkow, Adam B. ; Matzen, M.K. ; Thomas, Rayburn D. ; Cuneo, M.E. ; Vesey, Roger A. ; Herrmann, Mark H. ; Sinars, Daniel S. ; Seidel, David B. ; Schneider, Larry X. ; Mikkelson, Kenneth A. ; Harper-Slaboszewicz, V.H.
Seidel, David B. ; Mikkelson, Kenneth A. ; Thomas, Rayburn D. ; Harper-Slaboszewicz, V.H. ; Schneider, Larry X.
Savage, Mark E. ; Leeper, Ramon J. ; Leifeste, Gordon T. ; Lemke, Raymond W. ; Long, Finis W. ; Lopez, Mike R. ; Matzen, M.K. ; McKee, George R. ; Stoltzfus, Brian S. ; Struve, Kenneth W. ; Atherton, B.W. ; Stygar, William A. ; Thomas, Rayburn D. ; Woodworth, Joseph R. ; Bliss, David E. ; Cuneo, M.E. ; Davis, Jean-Paul D. ; Hall, Clint A. ; Herrmann, Mark H. ; Jones, Michael J. ; Knudson, Marcus D.
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