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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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Journal ArticleDOI
TL;DR: By the use of a discharge device consisting of a modified Marx generator and a 12 cm long discharge channel as the component discharge unit, the oscillator-amplifier system of a six-stage TEA N2 laser was operated with an output power of 8.8 MW (8.8 mJ, 1 ns) as mentioned in this paper.
Abstract: By the use of a discharge device consisting of a modified Marx generator and a 12 cm long discharge channel as the component discharge unit, the oscillator-amplifier system of a six-stage TEA N2 laser is operated with an output power of 8.8 MW (8.8 mJ, 1 ns).

9 citations

Proceedings ArticleDOI
17 Jun 2001
TL;DR: In this article, the authors explored two concepts that of a MOSFET triggered, microspark Marx-Bank and a combined micro-spark-semiconductor switch system as a means to generate simple, inexpensive nanosecond pulse generators.
Abstract: Nanosecond pulse generators, which provide kilovolt pulses, are required for applications such as pulsed lasers, electro-optical devices, electron heating of plasmas, and bioelectrics. Switches used to generate such short pulses include high-pressure spark gaps, photoconductive switches and semiconductor opening switches. Most of the pulse generators based on these switch technologies are designed for high voltage, high power applications. We have explored two concepts that of a MOSFET triggered, microspark Marx-Bank and a combined microspark-semiconductor switch system as a means to generate simple, inexpensive nanosecond pulse generators. The compact pulse generators allow us to generate electrical pulses of less than 10 ns duration, with amplitudes of several kV. The Mini Marx Bank has been shown to provide 6 kV pulses of 6 ns duration into a 10 M/spl Omega/ load and 2 kV into a 50 /spl Omega/ load. The second switch system, which utilizes a microspark switch and a commercially available diode to shorten the pulse, has provided 2.6 kV pulses of 2 ns duration into a 50 /spl Omega/ load. The low cost of the generator components, and the compact size make these devices easy to built and convenient to use in nanosecond pulsed power experiments.

9 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented a new method for forming nanosecond short pulse on high impedance load using the turn-on and turn-off delays of dual Marx, which combines advantages of the traditional solid-state Marx generator's modular stacking design to easily stack highvoltage pulse, flexible pulsewidth, and compact size.
Abstract: This article presents a new method for forming nanosecond short pulse on high impedance load using the turn-on and turn-off delays of dual Marx. The generator combines advantages of the traditional solid-state Marx generator’s modular stacking design to easily stack high-voltage pulse, flexible pulsewidth, and compact size. It can output unipolar or bipolar pulses by controlling the driving signal of each Marx. And the delay time between bipolar pulses can be flexibly adjusted. The dual Marx of the pulse generator is designed by the same seven-stage module stack. The SiC-MOSFET with fast turn-off capability and high repetition rate is used as the main switch, which has superior performance under high-frequency conditions. Through theoretical analysis and prototype test, the generator can generate voltage amplitude ±5 kV under 2- $\text{k}\Omega $ noninductive resistance load, pulsewidth 10–30 ns continuously adjustable, and the delay time of positive and negative nanosecond pulses is 100–400 ns. This high-voltage nanosecond pulse generator has a repetition frequency of up to 1 MHz in the burst.

9 citations

Proceedings ArticleDOI
27 May 2008
TL;DR: In this article, a 48 kV compact solid state switch with a lifetime of 105 pulses was used to produce high voltage, high current, short pulses for a variety of applications.
Abstract: Marx generators are used to produce high voltage, high current, short pulses for a variety of applications. High energy Marx generators are typically switched by gas insulated spark gaps, which have short lifetimes, 30 kA/mus, 8 kA, and 100 ns turn-on solid state switches and examined their performance under normal and fault-mode operating conditions in Marx generators. With 48 kV compact solid state switches, >107 pulse lifetime, high voltage Marx generators capable of high pulse repetition rates can be built. Three different Marx configurations have been tested; a conventional unipolar Marx, a unipolar Marx that uses magnetic assist to achieve >70 kA/mus current risetimes, and an inverting LC mode. For practical applications, solid state switches must survive system faults, such as shorts in downstream components or the load, which can result in twice the normal forward current, a large reverse current and with a large fraction of the system energy deposited in the switches. The switches should also tolerate trigger failures that can result in overvoltaging of one or more switches. This paper will include a description of the solid state Marx and triggering system and show data from multi-million pulse operation as well as fault mode survival testing such as load shorts and switch triggering failures. Near-term applications for the switches include the retro-fitting of the 5 pps Marxes used for the Electra laser pre-amplifier and main amplifier. Electra is a repetitively pulsed, electron beam pumped Krypton Fluoride (KrF) laser at the Naval Research Laboratory. This program is developing technologies to meet the Inertial Fusion Energy (IFE) requirements for durability, efficiency, and cost. The technologies developed on Electra should be directly scalable to a full size fusion power plant beam line. The present Electra Marxes use gas insulated spark gap switches with lifetimes of 105 pulses. By using the 48 kV Compact Solid State switch, lifetimes in excess of 107 pulses are expected.

9 citations

Journal ArticleDOI
TL;DR: In this paper, a solid-state pulse modulator based on the Marx generator was proposed to generate high voltage by multi-stacked storage-switch stages based on hydrogen thyratron-switched pulse-forming network.
Abstract: A medical linac is used for the cancer treatment and consists of an accelerating column, waveguide components, a magnetron, an electron-gun, a pulse modulator, and an irradiation system. The pulse modulator based on hydrogen thyratron-switched pulse-forming network is commonly used in linac. As the improvement of the high power semiconductors in switching speed, voltage rating, and current rating, an insulated gate bipolar transistor has become the more popular device used for pulsed power systems. We propose a solid-state pulse modulator to generator high voltage by multi-stacked storage-switch stages based on the Marx generator. The advantage of our modulator comes from the use of two semiconductors to control charging and discharging of the storage capacitor at each stage and it allows to generate the pulse with various amplitudes, widths, and shapes. In addition, a gate driver for two semiconductors is designed to reduce the control channels and to protect the circuits. It is developed for providing the pulsed power to a medical linac electron-gun that requires 25 kV and 1 A as the first application. In order to improve the power efficiency and achieve the compactness modulator, a capacitor charging power supply, a Marx pulse generator, and an electron-gun heater isolated transformer are constructed and integrated. This technology is also being developed to extend the high power pulsed system with > 1 MW and also other applications such as a plasma immersed ion implantation and a micro pulse electrostatic precipitator which especially require variable pulse shape and high repetition rate > 1 kHz. The paper describes the design features and the construction of this solid-state pulse modulator. Also shown are the performance results into the linac electron-gun.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202255
202132
202033
201951
201845