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

Abstract

. (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).

Spatiotemporally resolved imaging of streamer discharges in air generated in a wire-cylinder reactor with (sub)nanosecond voltage pulses

“…The experimental setup we used for the experiments in this paper was the subject of previous papers [26,63] and will be shortly summarized here.…”

“…The coaxial cable adds a delay to the high-voltage pulses and is required to synchronize the ICCD camera with the generated high-voltage pulses. The full design of this system is described in [27,24,25,26] and is schematically presented in Fig. 1.…”

B-Dot and D-Dot Sensors for (Sub)Nanosecond High-Voltage and High-Current Pulse Measurements

“…Recently, we designed and implemented an adjustable pulse duration (0.5-10 ns), adjustable output voltage (±0-50 kV), subnanosecond rise time (<200 ps) nanosecond pulse source for transient plasma generation [3]- [5]. We required largebandwidth, high-current and high-voltage sensors for the measurement of the output pulses of the pulse source.…”

Experimental setup for temporally and spatially resolved ICCD imaging of (sub)nanosecond streamer plasma

“…It then starts taking photos at all the userspecified t e -, t d -, and U g -settings before moving the camera to the next x-position. For each photo, the computer generates a pulse with the pulse source and records the waveforms from D-dot sensors, D 3 and D 4 and B-dot sensors, B 3 and B 4 from the oscilloscope. After all the measurements for one shutter delay are complete, the computer checks if all the generated pulses by the nanosecond pulse source produced a photo and if all pulses were recorded by the oscilloscope.…”

“…[1][2][3][4] This transient plasma consists of multiple parallel filaments called streamers. These streamers typically have a velocity in the range of 10 5 -10 7 m · s −1 and a diameter of several hundred micrometers to several millimeters.…”