Robert Lucero

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RTFS (Radiographic Integrated Test Stand) is an induction voltage adder designed by Sandia and PSD to provide 16-MV, 150-kA electron beams and other capabilities. Previous publications have reported on tests of a single pulse forming line and adder cell, including initial results of the effects of various degrees of non-uniform injection of current into the(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)
Velocity overshoot phenomena in n-channel Al-GaAs/InGaAs/GaAs enhancement mode MODFETs have been investigated for gate lengths ranging from 1 to 0.5 /spl mu/m. The study is based on Motorola's established CGaAs/sup TM/ technology. The observed average electron velocity /spl upsi//sub a/spl upsi// under the gate is 1.05, 1.34, 1.48, and 1.71/spl times/10/sup(More)
Sandia National Laboratories is investigating and developing high-dose and high-brightness flash radiographic sources. In collaboration with colleagues from MRC, AWE and Titan Pulsed Sciences Division, Sandia is conducting powerflow studies into paraxial diodes on the Radiographic Integrated Test Stand (RITS)<sup>1</sup>. Historically high-impedance(More)
The paraxial diode is the workhorse X-ray source at AWE for flash radiography of hydrodynamic experiments. It uses a gas filled cone to focus a 30-40 kA, 5 to 10 MV electron beam onto a tantalum target to produce a source 5-7 mm across. Future plans for a new hydrodynamics facility at AWE call for this diode to be fielded at a higher voltage on an inductive(More)
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