Design and Structure of an Extended Life High Current Sparkgap

Affinito, D.; Bar-Avraham, E.; Fisher, A.

doi:10.1109/tps.1979.4317222

Cited by 9 publications

(2 citation statements)

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“…Therefore, the erosion rate of electrode 2 is only half that of electrode 1. If we consider that electrode 2 was mainly the anode, the result that the cathode erosion rate is higher than the anode erosion rate is consistent with gas spark-gap studies, but is also highly dependent on repetition rate and electrode material [18], [21], [23].…”

Section: Spark-gap Erosionsupporting

confidence: 79%

Final Implementation of a Subnanosecond Rise Time, Variable Pulse Duration, Variable Amplitude, Repetitive, High-Voltage Pulse Source

Huiskamp

Heesch

Pemen

2015

IEEE Trans. Plasma Sci.

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. (2015). Final implementation of a subnanosecond rise time, variable pulse duration, variable amplitude, repetitive, high-voltage pulse source. IEEE Transactions on Plasma Science, 43(1), 444-451. DOI: 10.1109/TPS.2014 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-In this paper, we present the final implementation of our 0-50-kV picosecond rise time 0.5-10-ns pulse generator. The pulse generator will be used in future work to generate a (sub)-nanosecond streamer plasma for air purification research. The pulse generator is a single-line pulse generator with an oil spark-gap (SG), which generates 0.5-10-ns pulses with a 200-ps rise time and can operate at repetition rates of over 1 kHz into a 50-load. It is an improvement over the first implementation of our nanosecond pulse generator that we designed and verified experimentally in previous work. In this paper, we evaluate the performance of the final design. Furthermore, we present 3-D electromagnetic simulations of the nanosecond pulse generator and show that the simulations are in good agreement with the measurements. A variation in pulse duration from 0.5 to 10 ns is possible and the output pulses are square shaped without the large plateau behind the main pulse that was present in the pulses from the first implementation of the nanosecond pulse generator. At high voltages, the pulse top becomes less flat due to a timedependent mismatch in the spark-gap. Furthermore, investigation of electrode erosion of the oil spark-gap shows that the erosion rate of the electrodes is in the range of 200-600 μcm 3 · C −1 for the electrode that is mainly the cathode and 100-300 μcm 3 · C −1 for the electrode that is mainly the anode, respectively. This is almost an order of magnitude higher than most gas spark-gap studies show for brass electrodes. Therefore, electrode erosion in the oil spark-gap will be a limiting factor on the lifetime of the system. We designed a new electrode with a stainless steel head to increase this lifetime.Index Terms-3-D electromagnetic (EM) modeling, electrode erosion, high voltage, nanosecond pulses, oil switch, pulsed power supply, spark-gap (SG).

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Section: Spark-gap Erosionsupporting

confidence: 79%

Final Implementation of a Subnanosecond Rise Time, Variable Pulse Duration, Variable Amplitude, Repetitive, High-Voltage Pulse Source

Huiskamp

Heesch

Pemen

2015

IEEE Trans. Plasma Sci.

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“…Affinito et al [15] studied the phenomena associated with the gas composition in the switch, demonstrating that pure N 2 is more likely than air to lead to failure of the switch. The same result was obtained by Donaldson et al [16], who found a large amount of amorphous carbon ejected from the graphite surface and accumulated on surrounding insulator for repetitive pulse discharges in pure N 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch

Dai¹,

Li²,

Ren³

2021

Plasma Sci. Technol.

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As the widely implemented electrode material, graphite has the characteristic of sublimation by the thermal shock of the switching arc, and the produced carbon vapor is easy to condense into carbon powders and deposit in the switch. The impact of the type of dilution gas in a mixture of 20% oxygen and 80% dilution gas on the sublimation and oxidation characteristics of the graphite electrode is investigated. It is found that when nitrogen dilution gas was replaced by argon, the heat flux to the electrodes decreased, which led to a 63% reduction of graphite sublimation. At the same time, the cooling rate of the arc was slower in argon, which promotes oxidation of the carbon vapor. The residual solid carbon can be reduced by 70%–85% by using argon as the dilution gas. Consequently, it is demonstrated that the stability and working life of the switch could be increased by appropriate selection of the dilution gas.

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2017

Foundations of Pulsed Power Technology

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Design and Structure of an Extended Life High Current Sparkgap

Cited by 9 publications

References 0 publications

Final Implementation of a Subnanosecond Rise Time, Variable Pulse Duration, Variable Amplitude, Repetitive, High-Voltage Pulse Source

Final Implementation of a Subnanosecond Rise Time, Variable Pulse Duration, Variable Amplitude, Repetitive, High-Voltage Pulse Source

Effect of dilution gas composition on the evolution of graphite electrode characteristics in the spark gap switch

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