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Field emitter arrays have the potential to provide high current density, low voltage operation, and high pulse repetition for radar and communication. It is well known that packing density of the field emitter arrays significantly affects the emission current1. Previously we conducted experiments using two-and four-cathode configurations. Here we extend our previous work and present experimental results...
Field emitter arrays have the potential to provide high current density, low voltage operation, and high pulse repetition for radar and communication. It is well known that packing density of the field emitter arrays significantly affect the emission current1. Previous experiments were conducted with 1000s of field emitters which makes the analysis of electric field screening difficult. Here we describe...
Predictive numerical simulation of microwave generation and plasma interactions requires resolution of multiple length and time scales in complex 3-dimensional geometries. The Particle-in-Cell (PIC) method for the numerical formulation of the basic governing equations is a well-understood and reliable approach if we are able to assume that short-range collisional effects are on average small. Particle...
Summary form only given. Foils may soon become necessary to achieve the required mass for higher current-driven x-ray sources. They may also offer useful options for x-ray pulse shaping and as imploding liners for magnetized target fusion. This paper reports our latest design and experimental progress on the dominant instability, the magneto-Rayleigh-Taylor instability (MRT). Planar Al foils as thin...
Field emission cathodes have been a research topic for many decades, with recent interest centering on carbon nanotube (CNT) and carbon fiber structures. These cathodes may well prove useful for a variety of applications, ranging from compact millimeter and THz vacuum electronic devices (VEDs), flat panel displays, and compact x-ray sources. In this presentation we describe experiments performed by...
Summary form only given. Experiments are underway at UM on the first 1-MA LTD to be operated in the USA following its development at the Institute of High Current Electronics in Tomsk, Russia. This LTD employs 80 capacitors and 40 spark-gap switches arranged in 40 "bricks" that each generate 25 kA when charged to +-100 kV. Initial experiments at UM generated nearly 1-MA into resistive loads...
Summary form only given. Post-hole convolutes are commonly used in large scale pulsed power devices to combine the current from several sources. The primary examples of convolute use are Load Current Multipliers (LCMs) and current combination from multiple Self-Magnetically Insulated Transmission Lines (MITLs). Sandia National Laboratory's Z-Machine utilizes a double post-hole convolute to combine...
With the support of the Sloan Foundation and the State University of New York Learning Environments, faculty from three public electrical engineering programs have developed and offered undergraduate courses in electrical engineering with a goal of a fully online undergraduate degree program. This will be the first such program in the nation. To date, nine required or ldquocorerdquo courses and seven...
We present designs, resistive-load test results and experimental plans of the first 1 MA z-pinch in the USA to be driven by a Linear Transformer Driver (LTD). The Michigan Accelerator for Inductive Z-pinch Experiments, (MAIZE), is based on the LTD developed at the Institute for High Current Electronics in collaboration with Sandia National Labs. This LTD utilizes 80 capacitors and 40 spark gap switches...
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