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We are developing new low-inductance gas switches for Linear Transformer Drivers (LTDs). Linear Transformer drivers are a new pulsed-power architecture that may dramatically reduce the size and cost of future pulsed-power drivers, but which place stringent requirements on gas switches. A typical large LTD may have 10,000 or more gas switches that are DC-charged to 200 kV and that must be triggered...
Since the completion of the ZR upgrade of the Z accelerator at the Sandia National Laboratories in the fall of 2007, many shots have been taken on the accelerator, and there has been much opportunity to compare circuit-code predictions of the performance of the machine with actual measurements. We therefore show comparisons of measurements, and describe a full-circuit, 36-line Bertha circuit model...
With the successful completion of its refurbishment the Z machine at Sandia is now routinely operating with currents over 26 MA into various loads. Now that the machine is operating we can measure current and voltage at various locations throughout the machine and compare with circuit code predictions. These measurements have led to improvements in the model that provide a more accurate predictive...
Summary form only given. The Z pulsed power driver at Sandia National Laboratories is used to develop high energy density Z-pinch X-ray sources for inertial confinement fusion research and radiation effects testing, and drive megabar pressures in material samples for equation of state studies. The pulsed power system is in the process of being replaced, improving reliability and increasing energy...
High current z pinches are used for a variety of high energy density physics applications, including inertial confinement fusion research. Present state of the art in single-pulse drivers can deliver twenty megamperes through an imploding plasma load; upon stagnation on the axis the plasma radiates more than a megajoule of energy in a few nanoseconds. Emphasis on fast plasma implosions (one hundred...
The ZR z-pinch driver is being upgraded to deliver 26 MA into a standard load, a substantial increase compared to the present Z maximum of 20 MA into the same standard load. The upgraded accelerator has basically the same foot print as the existing Z, thus bringing a number of challenges, one of the critical ones being the insulator stack. The present stack is formed by 4 levels, the top two with...
Sandia National Laboratories (SNL) is developing ZR, a 26-MA driver for z-pinch experiments, by replacing most of the pulsed power hardware presently on Z with hardware of a new design. The accelerator was modeled using the transmission line code, Bertha, to determine the time-dependent voltage and current waveforms between stages in each of 36 modules. Bertha is an NRL-developed transmission line...
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