J. E. Maenchen

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The design of a 6.5-MV linear transformer driver (LTD) for flash-radiography experiments is presented. The design is based on a previously tested 1-MV LTD and is predicted to be capable of producing diode voltages of 6.5 MV for a 50-Omega radiographic-diode load. Several fault modes are identified, and circuit simulations are used to determine their effect(More)
K. R. LeChien, M. E. Savage, V. Anaya, D. E. Bliss, W. T. Clark, J. P. Corley, G. Feltz, J. E. Garrity, D. W. Guthrie, K. C. Hodge, J. E. Maenchen, R. Maier, K. R. Prestwich, K. W. Struve, W. A. Stygar, T. Thompson, J. Van Den Avyle, P. E. Wakeland, Z. R. Wallace, and J. R. Woodworth Sandia National Laboratories, Albuquerque, New Mexico 87185, USA Ktech(More)
Sandia National Laboratories is leading an intensive research effort into fielding and diagnosing electron-beam flash radiographic X-ray sources. Several X-ray sources are presently being studied, including the self-magnetic pinched diode, the immersed Bz diode, and the plasma-filled flat cathode (paraxial) diode. These studies are being carried out on(More)
Inductive Voltage Adders (IVA) such as RITS [1] use a self magnetically insulated transmission line (MITL) along the centerline of the induction cells to add the cell voltages and transport the power to the load. As the voltage increases along the MITL the vacuum flow or sheath current becomes a larger fraction of the total MITL current and the more useful(More)
We are studying the behavior of self-breaking, high-voltage water switches for the Z refurbishment project. In Z-20, three or four water switches in parallel are charged to 4 MV in /spl sim/220 ns. The water gap between switch electrodes is 13-15 cm, and the enhancement of the positive and negative electrodes is varied to study time-evolution of the(More)
Inductive voltage adder (IVA) accelerators were developed to provide high-current (100s of kA) power pulses at high voltage (up to 20 MV) using robust modular components. This architecture simultaneously resolves problems found in conventional pulsed and linear induction accelerators. A variety of high-brightness pulsed X-ray radiographic sources are needed(More)
Sandia National Laboratories (SNL) is developing intense sources for flash x-ray radiography. In collaboration with Mission Research Corporation, the Atomics Weapons Establishment, and Titan Pulsed Sciences Division, SNL has studied power flow into various electron beam diodes on the radiographic integrated test stand (RITS). Historically, high-impedance(More)
High intensity pulsed electron beams are used to create bremsstrahlung x-ray sources for flash radiographic interrogation of dynamic experiments. Typical industrial sources operate below 200 GW/cm<sup>2</sup> intensities, while experimental requirements can demand above 50 TW/cm<sup>2</sup>. Recent developments in pulsed power-driven high intensity electron(More)
A 1 MV linear transformer driver (LTD) is being tested with a large area e-beam diode load at Sandia National Laboratories (SNL). The experiments will be utilized to determine the repeatability of the output pulse and the reliability of the components. The 1 MV accelerator is being used to determine the feasibility of designing a 6 MV LTD for radiography(More)
Cygnus is the prototype of a radiographic x-ray source leveraging existing hardware and designs to drive a rod-pinch diode at 2.25 MV. This high-resolution x-ray source is being developed to support the Sub-Critical Experiments Program (SCE) at the Nevada Test Site (NTS), and as such employs a modular technology that is scaleable to higher voltages and can(More)