Double-propagation mode in short-gap spark discharges driven by HV pulses with sub-ns rise time

H. Höft (Corresponding author), M. M. Becker, J. F. Kolb, T. Huiskamp

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

3 Citaten (Scopus)

Samenvatting

The object of this study is the investigation of spark discharges ignited by unipolar positive rectangular high voltage (HV) pulses with 200 ps rise time and (15 ± 2) kV amplitude with 3 ns duration full width at half maximum in synthetic air in a 1.2 mm pin-to-pin gap (tungsten electrodes) at atmospheric pressure. The discharge development was recorded by synchronised iCCD and streak camera measurements in single-shot operation, revealing a two-stage propagation mode. The discharge started with a fast initial breakdown across the entire gap (∼10 mm ns-1) during the HV slope, followed by a much slower (∼0.1 mm ns-1) propagation originating from both electrodes towards the gap centre. The combination of high-resolution diagnostics with numerical modelling indicated that the initial breakdown phase is caused by the rapid increase of electric field strength during the steep HV slope, which leads to the simultaneous fast propagation of a positive and a negative streamer.

Originele taal-2Engels
Artikelnummer085002
Aantal pagina's7
TijdschriftPlasma Sources Science and Technology
Volume29
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - aug 2020

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