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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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TL;DR: In this paper , the SF6-insulated radial switch is used as a crowbar in a MV Tesla-type generator to produce pulsed electric fields in very large volumes, for proof-of-concept experimentation of a novel non-invasive food processing technology.
Abstract: The paper presents the development of a megavolt-class SF6-insulated radial switch. The switch is used as a crowbar in a MV Tesla-type generator to produce pulsed electric fields in very large volumes, for proof-of-concept experimentation of a novel non-invasive food processing technology. The main features of the switch include: (1) Using SF6 gas as the insulation gas; (2) a breakdown channel along the radial direction, rather than axial; (3) a compact configuration with its volume limited to 3.2 L. In order to achieve a ruggedized high voltage insulation as well as an enhanced operation safety, the following design techniques were applied: (1) Structures of the switch were well designed to minimize the local electric filed in the cathode triple junctions; (2) the grooves of surface of the insulators that enclose the switch were finely optimized to keep the surface flashover under control; (3) a prolate spheroid geometry of the high voltage electrode was adopted to achieve a better control of the gas breakdown. This paper describes in detail the design and the preliminary test of this switch.
20 Nov 2014
TL;DR: In this article, a 5-stage ultrafast coaxial Marx generator with a rise time of 800ps, maximum output voltage 75kv, pulse width (FWHM) of 1.5ns, and source impedance 63Ω is presented.
Abstract: A Marx generator delivers high power electrical pulse in very short duration and can be configured to be compact. This ultrafast coaxial Marx generator has also been developed without pulse shaping/peaking circuit. The results of 5-stage ultrafast coaxial Marx generator has a rise time of 800ps, maximum output voltage 75kv, pulse width(FWHM) of 1.5ns, and source impedance 63Ω is presented. The coaxial geometry is used throughout the system to achieve low value of inductance leading to fast rise time of the output pulse. The fast Marx generator, load impedance and Current Viewing Resistor (CVR) are connected in series and the 50mΩ CVR is used as a diagnostics to measure the output current. This compact fast Marx generator is fit into a stainless steel (metallic) cylinder. The fast Marx generator is tested for the charging voltages of 10kv with 50Ω and 100Ω ceramic resistive loads. The design and experimental results of coaxial fast Marx generator are discussed.
TL;DR: In this article, a pseudospark discharge-based free electron laser was proposed to achieve an output power of 101MW at a frequency of 38GHz with a beam energy of 300keV, a current of 2kA and a beam emittance of 48mm mraa.
Abstract: An electron beam source based on pseudospark discharge was successful in operation at the beam voltage of 200keV and beam current of 2kA. The detailed design of a compact free electron laser using an electron beam by a pseudospark discharge is described. The compact free electron laser consists of a smaller Marx generator with 6 capacitors and switches, a water capacitance of 6nF and a beam source with a high brightness of 3×1011
A/(m rad)2. The computer simulation shows that an output power of 101MW is expected at a frequency of 38GHz with a beam energy of 300keV, a current of 2kA and a beam emittance of 48mm mraa.
03 Jul 1995
TL;DR: In this article, a modified Physics International Pulserad 110A was used for high power microwave experiments at the University of New Mexico (UNM) using an electron beam diode having a graphite annular knife-edge cathode.
Abstract: Long-pulse high power microwave experiments are being conducted at the University of New Mexico (UNM) using a modified Physics International Pulserad 110A. The Pulserad 110A, which previously consisted of an 11-stage Marx bank followed by a Blumlein, has been modified by replacing the Blumlein with a parallel L-C network, as described by Cummings. Both the Marx bank and the L-C network together form a type-A pulse-forming network with an output impedance of 40 /spl Omega/, a pulse duration of 500-700 ns, and a peak voltage and current for a matched load of 570 kV and 14.3 kA, respectively. The UNM Pulserad 110A drives an electron beam diode having a graphite annular knife-edge cathode. The electron beam that is generated is injected into a slow wave structure (SWS) having 12 periods with variable ripple amplitudes. Microwave radiation in the TM/sub 01/ mode is observed with peak powers on the order of 170 MW and pulse widths at full-width, half-maximum of 20-25 ns. Longer pulse widths are observed for lower powers. Studies are being conducted to determine the effects of changes in the anode-cathode gap spacing and cathode diameter on pulse duration for a given SWS configuration. Both vacuum and plasma-filled experiments are being performed to investigate possible increase in pulse width using plasma filling. The system design will be presented along with experimental results.
TL;DR: In this paper, a wideband LC oscillator which is composed of a high voltage switch and a fat dipole antenna was designed and radiation characteristics were analyzed and simulated and measured results showed that 3 dB bandwidth of high voltage switches without fat dipoles is about 9% of the received power.
Abstract: In this paper, a wideband LC oscillator which is composed of a high voltage switch and a fat dipole antenna was designed and radiation characteristics are analyzed. A Marx generator was used as a high voltage pulse generator of the proposed wideband LC oscillator and corner reflector was used to obtain high directivity. According to simulated and measured results, 3 dB bandwidth of high voltage switch without fat dipole based on the received power is about 9%(${\lambda}_1