Marx generator

About: Marx generator is a research topic. Over the lifetime, 1276 publications have been published within this topic receiving 8970 citations.

A 2.5 Gigawatt Liquid Dielectric Coaxial Pulse Forming Line

Abstract: : The pulse forming line (PFL) can store approximately 600 joules at 100 kilovolts. Line impedance is 0.86 ohm and discharge time into a matched load is 200 nanoseconds. The coaxial line is filled with a mixture of 60% ethylene glycol and 40% water, by weight, yielding the maximum freezing point depression. The dielectric liquid is dearated, deionized and cooled to subzero temperature in order to produce an intrinsic time constant of tens of milliseconds. A 50 kilovolt DC power supply with a current rating of 4 amperes is used to resonantly charge the PFL to 100 kilovolts in the millisecond time regime. A Marx generator is used for fast charging at high voltage. The PFL is being used for investigation of long term charging and breakdown statistics of water/glycol mixtures. It is also used for switch testing. In this paper, the PFL, charging systems, and liquid dielectric conditioning system are described. Experimental results of long term charging and breakdown statistics are also presented.

Direct Approach of RF/HPM Generation in Regards to MCG

Abstract: Summary form only given. In this work we offer an alternative method to generate the powerful RF/HPM pulse in comparison to the idea presented by Baum et al. where the impulse like waveform of very short (100 ps) rise time generates the frequencies from 2 107 to 2 109 Hz . We have carried out computer simulations and experimental studies. The results show that the conventional Marx generators can also produce RF/HPM emissions. The main reason for the emissions is the consequential erection of the stages in the Marx generator. The theoretical model to be presented agrees well with the experiments and we have related this model to the operation of MCG as the RF/HPM device. In addition to the wideband spectrum, our systems can be made to radiate mainly at one of the following discrete frequencies such as 380 MHz, 520 MHz, 1.19 GHz, 1.45GHz etc. For example, when the stored energy in the Mini-Marx generator is 10 Joules, the radiated electric field exceeds 100 kV/m at a frequency of 1.19 GHz. The results obtained with several other Marx generators are presented. In the experiments on the energy compression, it was observed that the voltage induced by the exploding wire takes the shape of the Gaussian function with the rise time of 40-50 ns, the width of about 100 ns and the amplitude up to 700 kV. Such waveforms can also be obtained with the Marx generator. Using such slow generator, we demonstrate that the RF/HPM generation is a weak function of the rise-time. Here, the RF/HPM radiation is produced by a simple oscillatory circuit operating in air.

Noise reduction of Marx generator erection

Abstract: An experiment has been designed to measure charge injection into insulators using high voltage pulses. In order to limit the area of charge injection, point plane geometry and low energies are used. These low energies are achieved by using a small Marx generator, a ring up inductor and a vacuum feedthrough bushing and insulator sample to provide a CLC ringup. Connecting the ground plane behind the sample introduces a second inductance which produces a second mesh in the equivalent circuit. Charge injection into the insulator provides a short risetime pulse which excites the second mesh. Monitoring the excitation of the current in this second mesh provides charge injection information. The erection of the Marx generator via spark gaps is a source of high frequency electrical noise which also excites the second mesh and therefore must be reduced if charge injection information is to be obtained. Inserting ferrite cores of proper frequency response between stages of the Marx generator, as well as on both sides of the ring up inductor, is shown to reduce the erection noise. This noise reduction is demonstrated by a decrease in the excitation of the high frequency resonant mesh. With the ferrite cores inserted the amplitude of the second mesh excitation is 20% of what it is without the ferrites.

Diagnosing high-reliability, low-jitter Marx generators

Abstract: We have made photonic measurements to assess the performance of a bipolar Marx generator. Measurements of the switch‐closing sequence were made with a high‐speed multichannel data recorder using fiber optics to monitor the light produced by each switch closure. Experience gained during this research coupled with computer simulations has led to a fundamental understanding of the operation of these multistage devices. As a result of this research, significant improvement in erection time jitter has been realized. Erection time jitter has been measured as low as 2.6 ns for a 3.2‐MV, 16‐stage PBFA‐I Marx generator. Photonic data are presented from this research program, along with a discussion on the use of computer simulations and photonic measurements in designing low‐jitter Marx generators.

A switch combination structure for marx generator

Abstract: The utility model discloses a switch combination structure for marx generator, the marx generator includes a plurality of grades of pulse form moulding pieces, and a spark gap switch is connected to the interstage, and all spark gap switches are for puncture the spark gap switch certainly, and first order spark gap switch adopts even field plate switch, all the other spark gap switches adoption non -uniform field electrode switches, airtight pressure vessel is wholly arranged in to the marx generator, adopt the utility model provides a switch combination form, under the condition of not using the source of triggering, can be under higher insulating atmospheric pressure establish from puncturing. Under the same output, can make the marx generator further miniaturized.