Topic
Marx generator
About: Marx generator is a research topic. Over the lifetime, 1276 publications have been published within this topic receiving 8970 citations.
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27 Jun 1999
TL;DR: The FEMP-2000 pulser as discussed by the authors is a fast risetime EMP generator designed to drive a horizontally polarized dipole antenna, which is operated at the center of the antenna, typically 30 meters above the ground.
Abstract: The FEMP-2000 pulser is a fast risetime EMP generator designed to drive a horizontally polarized dipole antenna. The pulser is operated at the center of the dipole antenna, typically 30 meters above the ground. It is lightweight and specifically engineered to be easily transportable. The Marx generator and pulse compression stages are located in one end of a biconic structure that is symmetric in area and mass. This EMP generator delivers a double exponential waveform with a peak voltage adjustable between 0.5 and 2 MV into a matched 150 ohm load. It has a risetime below 1 ns (10-90%) and an e-fold decay time of 75 ns. The fast risetime output is achieved through three stages of pulse compression. The system is powered from the ground by a hydraulic motor and an onboard generator subsystem. It is fully remotely controlled through pneumatics and fiber optics, so the operator can turn the system on and off and make all adjustments required from ground level to change the output voltage. The generator is very reproducible in risetime and peak amplitude (within 5%) over the entire 4:1 operating voltage range, while the shot-to-shot RMS throughput delay jitter of the system is less than 9 nS over this range as well. Pulser performance and design details are presented.
16 citations
TL;DR: In this paper, a TE discharge, 15mm aperture, multi-atmosphere, CO2 laser amplifier is described, with measured electrical characteristics and gain measurements on the 9.294μm, 9R(16) line.
Abstract: A novel TE discharge, 15‐mm aperture, multiatmosphere, CO2 laser amplifier is described, with measured electrical characteristics and gain measurements on the 9.294‐μm, 9R(16) line. The electrical circuit used in this amplifier is a realistic alternative to the Marx bank or conventional LC inversion circuit and, similarly, it would be useful for excitation of other gas lasers as well. This automatically preionized, double‐sided, fourfold LC inversion circuit uses only one spark gap, and it is shown to provide small‐signal gains of 5.7% cm−1, at 120 J l−1 atm−1 and 10 atm. The generalization to an n–stage device, which would be suitable for higher pressures, and larger apertures, is discussed.
16 citations
30 Jun 2002
TL;DR: A plasma source ion implantation (PSII) modulator has been built using this technology development and provides 30 kV, 400 A, 1-50 /spl mu/sec variable pulse widths, and operates at 75 kW of average power Peak powers as high as 24 MW have been demonstrated.
Abstract: A number of applications that require <1 /spl mu/sec risetimes at high voltage and current cannot be easily satisfied with standard designs employing low voltage solid-state components driving a large step-up turns ratio transformer North Star Research reports on the development of several products that employ the topological erection of voltages using a Marx generator stacking arrangement of lower voltage IGBT devices The configuration does not place the semiconductors in a series arrangement, thereby eliminating a failure mode wherein the loss of a single device would over-stress the stack of IGBT parts A plasma source ion implantation (PSII) modulator has been built using this technology development and provides 30 kV, 400 A, 1-50 /spl mu/sec variable pulse widths, and operates at 75 kW of average power Peak powers as high as 24 MW have been demonstrated
16 citations
TL;DR: In this paper, a 2MV Marx generator installed in a completely co-axial form is developed, which reduces the internal inductance down to about 150 nH and makes it possible to produce high intensity electron beams of mare than 20 kA when applied to a field emission type electron gun.
Abstract: A 2MV Marx generator installed in a completely co-axial form is developed. The structure reduces the internal inductance down to about 150 nH hence makes it possible to produce high intensity electron beams of mare than 20 kA when applied to a field emission type electron gun. The rise time of the output voltage pulse is less than 5 nsec.
16 citations
29 Jun 1997
TL;DR: In this article, the development of a compact Marx generator to drive loads with impedances on the order of 10 ohms is discussed, and the entire assembly is housed in a 1.2 m diameter aluminum pipe pressurized with 30 psig sulfur hexafluoride.
Abstract: One of the goals of the High-Energy Sources Division of the Advanced Weapons and Survivability Directorate at the Phillips Laboratory is to develop high-power microwave sources and their related pulsed power. Here, the development of a compact Marx generator to drive loads with impedances on the order of 10 ohms is discussed. It is an 8 stage design, 4 stages charged to +100 kV and 4 stages charged to -100 kV, that stores 19.2 kJ at full charge. The Marx, excluding the trigger generator, has a diameter of 0.9 m and a height of 0.7 m. The entire assembly is housed in a 1.2 m diameter aluminum pipe pressurized with 30 psig sulfur-hexafluoride. The same sulfur-hexaflouride that insulates the Marx from its container also serves as the working gas in the gas-insulated switches of the Marx. In experiments to date, the Marx has been fired hundreds of times at full voltage into loads varying in impedance from 5 to 10 ohms. The design and fabrication of the Marx generator and the experimental results are given.
16 citations