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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TL;DR: A solid state high power modulator capable of delivering 120 kV and 60 A developed in collaboration with the JEMA Corporation, ESS Bilbao, and the SNS for driving high power klystrons is presented.
Abstract: A solid state high power modulator capable of delivering 120 kV and 60 A developed in collaboration with the JEMA Corporation, ESS Bilbao, and the SNS (ORNL) for driving high power klystrons is presented. Pulses with less than 10 μs risetime and flatness under 0.1% are obtained with programmable frequency pulses between 2 and 50 Hz. Eight solid state switches combined with custom air-insulated high voltage transformers working at a switching frequency of 4 kHz produce high quality pulses by phase shifting the transformer drives. Each relative high frequency stage pumps a double stage high voltage Marx generator that supplies the output pulse shape and frequency. This merged topology between a Marx generator and direct modulator takes advantage of the strengths of both approaches. Low energy storage in the output stages assures safe operation in case of a load arc discharge. Real time voltage correction during the pulse is also provided to compensate for the droop inherent with the use of low energy storage in the output stages. Data at full power with a dummy resistive load are presented.
6 citations
20 Mar 2016
TL;DR: In this paper, a novel design scheme for voltage droop compensation based on resonant circuit in solid-state bipolar (positive and/or negative pulses) high-voltage Marx generator, using off-the-shelf components, design and control, is described.
Abstract: The purpose of this paper is to present and discuss the voltage droop compensation associated with long pulses generated by solid-state bipolar or unipolar high-voltage Marx modulators. In particular a novel design scheme for voltage droop compensation based on resonant circuit in solid-state bipolar (positive and/or negative pulses) high-voltage Marx generator, using off-the-shelf components, design and control, is described. The compensation consists in adding one auxiliary resonant stage to the existing Marx stages, without changing the modularity and topology of the circuit. The auxiliary compensation voltage is added to the output voltage to compensate the pulse voltage droop. Experimental results are presented for five stages Marx circuit, 10% voltage droop, using 1 kV pulse amplitude, 100 µs pulse width, 9.5 ms relaxation time and with 50 Hz pulse repetition rate.
6 citations
TL;DR: In this paper, the design, development and commissioning of a 1 MV pulsed electron accelerator producing flash X-Rays is described, which is based on bipolar MARX generator and Blumlein followed by explosive electron emission diode assembly.
Abstract: The design, development and commissioning of 1 MV pulsed electron accelerator producing Flash X-Rays is described in this paper. This pulsed power system is based on bipolar MARX generator and Blumlein followed by Explosive electron emission diode assembly. The peak pulsed power is ~ 30 GW. The electron energies in the range of 400 keV to 1030 keV are produced and delivered to experimental load of Industrial diode. Electrons are emitted from a stainless steel ring at ground potential by explosive field emission and bombard the anode tungsten pin for flash X-rays generation. The relativistic electron beam has been simulated within the diode chamber and pattern shows the beam propagation. Imaging plates are used to characterize the source size and optimization has been reported.
6 citations
Patent•
19 Jul 2007
TL;DR: In this paper, the Marx generator is used as a resonator and a Hertzian antenna dipole to produce high-energy microwave pulses, which is made possible by means of a device with a particularly compact design.
Abstract: The production and emission of high-energy microwave pulses are made possible by means of a device with a particularly compact design if the capacitor column ( 12 - 12 ) of the Marx generator ( 11 ) whose series circuit conventionally itself feeds a microwave generator with a matched antenna geometry, is now itself used—dispensing with the microwave generator and its antenna—directly as a resonator and Hertzian antenna dipole ( 24 ). Its oscillation response can be optimized by triggered spark gaps ( 14 ) for the switching of capacitors ( 12 ), and by means of plates ( 19 ) connected at the ends, in order to increase the stray capacitances.
6 citations
Patent•
18 Dec 2013
TL;DR: In this article, a compact nanosecond high-voltage pulse source of a Marx generator is presented, and a peaking circuit in an existing high voltage pulse source is removed.
Abstract: The invention discloses a compact nanosecond high-voltage pulse source of a Marx generator, and a peaking circuit in an existing high-voltage pulse source is removed. The compact nanosecond high-voltage pulse source is composed of the Marx generator, a control unit and a high-voltage direct current charging power supply. The Marx generator comprises a shell, a pulse capacitor and a gas spark switch. The shell, the pulse capacitor and the gas spark switch are cylindrical and are coaxially arranged. The shell comprises a metal shell body, an input end insulating supporting cover and an output insulating supporting cover, wherein the input end insulating supporting cover and the output end insulating supporting cover are located at the two ends of the shell body and fixedly connected with the shell body. According to the full-circuit simulation model of the Marx generator, a self-breakdown switch can be simulated with a PSPICE model, when the circuit model is built, the PSPICE module block can be directly called, only few parameters need to be set, and the model is much convenient to use.
6 citations