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: In this paper, the dual channel triggering of a spark gap switch by fiberoptic transported ruby laser radiation is discussed, and the correlation of this behavior with the space charge build up in the slightly over-volted gap is discussed.
Abstract: The dual channel triggering of a spark gap switch by fiberoptic transported ruby laser radiation is discussed. The spark gap is the output switch of a 20-ns water dielectric Blumlein generator. The Blumlein generator is pulse charged in approximately 250 ns by a three-stage Marx bank to 150 kV. The spark gap is operated at a pressure of 2540 torr with a mixture of Ar and N2 gas and an electrode separation of 2 cm. Two 1-mm diameter quartz optical fibers are used to transport 2 2-MW laser beams into the spark gap onto points 6 cm apart on the target electrode. The two beams are obtained by optical splitting of the output of a single laser. Under appropriate conditions, two arc channels are initiated by the laser beams along their paths. A small improvement in current rise time for dual channel events over single channel events is observed. Moreover, the number of successful dual channel events is observed to depend on the time of laser entry with reference to the beginning of the charging pulse, and not the gap polarity. The correlation of this behavior with the space charge build up in the slightly over-volted gap is discussed.
13 citations
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TL;DR: Simulation and experimental results confirm that the proposed topology is capable of generating unipolar pulses with desirable amplitude and repetition frequency using a low-voltage dc supply.
Abstract: In this paper, a high-voltage unipolar pulse power generator is introduced for electroporation applications. Operating principle of the proposed structure is based on the buck-boost (BB) converter. The generator is comprised of parallel modules connected to the converter through an SCR and is supplied by a low-voltage dc source. Each module consists of an insulated gate bipolar transistor (IGBT), two diodes, and a capacitor. In fact, the proposed topology is a combination of the Marx generator and BB (MG-BB) converter. In comparison with other modular MG-BB structures, the proposed topology achieves interesting advantages including simpler structure, reduction of IGBTs voltage rating, and reducing number of components (inductors and switches). In order to clarify the features of the proposed structure, it has been compared with other unipolar MGs considering different aspects including the number of circuit components, number of required input supplies, amplitude of the output pulse, and the maximum voltage across switches and diodes. To validate the effectiveness of the structure, simulation and experimental results are presented. The results confirm that the proposed topology is capable of generating unipolar pulses with desirable amplitude and repetition frequency using a low-voltage dc supply.
13 citations
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TL;DR: When impulse voltages of very short time to half-value are generated with a standard Marx circuit, there may be a considerable decrease in efficiency as mentioned in this paper, which is not the case here.
Abstract: When impulse voltages of very short time to half-value are generated with a standard Marx circuit, there may be a considerable decrease in efficiency.
13 citations
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17 Jun 2007TL;DR: In this article, a Marx generator based on solid state switches has been proposed, which has dual functions by combining high repetitive rate from semiconductor switch with voltage adder from Marx generator principle.
Abstract: High voltage pulsed power supply with high repetitive rate has found wide applications in industry, and military such as plasma source for ion implantation, microwave generator and high pulsed power laser. The conventional pulsed power supply is limited by gas switch with short lifetime and low repetitive frequency. In recent years Marx generator based on solid state switches has proposed. It has dual functions by combining high repetitive rate from semiconductor switch with voltage adder from Marx generator principle. The solid state switches can be MOSFET , IGBT or SCR. This all-solid-state pulsed power supply has multifold advantages such as flexibility of pulse voltage amplitude, pulse width and repetitive rate and long lifetime and compactness.
13 citations
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TL;DR: In this paper, a solid-state pulse modulator based on the Marx generator was proposed to improve the power efficiency, achieve the system compactness, and optimize the cost and space.
Abstract: The linear accelerators (linacs) producing high energy and high power of electron-beam or X-ray beam have been used in medicine, industry, national security, etc. In the linac, the electrons are generated by the electron gun and accelerated in the accelerating column with the high-power RF fields. The high-voltage pulses from the pulse modulator are supplied to the RF power source and the electron gun. The pulse modulator is one of the big and expensive components in the linac. The commercial medical linacs commonly use the pulse modulator based on the thyratron-switched pulse-forming network. In order to improve the power efficiency, achieve the system compactness, and optimize the cost and space, the solid-state pulse modulator based on the Marx generator was proposed. The low-power solid-state pulse modulator was developed for the electron gun operation. The conceptual design and functional results were confirmed. In order to apply it to the RF power source, such as a magnetron or a klystron, the 6-MW pulse modulator with the same Marx scheme is proposed. It consists of 40 storageswitch stages and one high-voltage pulse transformer, producing the pulse of 50 kV and 120 A required by the magnetron in the medical linac. A storage-switch stage was designed for insulated gate bipolar transistors to switch high current of 280 A and 720 V and to use the capacitor of 25 μF which was chosen for the voltage droop of 10% with the pulsewidth of 5 μs. The prototype system with eight storage-switch stages was fabricated and tested with a load system. The performance results show that it can be extended to be the 6-MW solid-state pulse modulator. In this paper, we describe the design features, and discuss the results and also the future plan to optimize the solid-state pulse modulator in the medical linac.
13 citations