Charge transfer equilibrium in surface barrier discharge: continuous current and negative ion-driven ionisation wave

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00107807" target="_blank" >RIV/00216224:14310/19:00107807 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1361-6595/ab4b91" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6595/ab4b91</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6595/ab4b91" target="_blank" >10.1088/1361-6595/ab4b91</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Charge transfer equilibrium in surface barrier discharge: continuous current and negative ion-driven ionisation wave

Popis výsledku v původním jazyce

Sensitive measurements of very weak electrical currents in sinusoidally driven surface barrier discharge in atmospheric air are reported for discharge arrangements with and without liquid covering the top electrode. The transferred charge of the low-power discharge is carefully quantified and it is shown that after the complete voltage period the total charge balance is approaching zero. This rather obvious result is mechanically assumed in the literature, yet it is experimentally not understood in detail. We show that continuous and pulsed micro-ampere currents measured during the negative polarity are responsible for the gradual renewal of the charge transfer equilibrium abruptly distorted by strong electrical pulses caused by positive streamers during the opposite half-period. Using synchronised ICCD imaging we reveal that weak continuous current is caused by slowly expanding surface discharges stemming from previously established cathode spots. The expansion is caused by a surface ionisation wave. Based on the experimental evidence, supported by the theoretical results found in literature, we conclude that an expanding negative ion cloud is responsible for the electric field enhancement at its forefront which is sufficient to ionise the surrounding air.

Název v anglickém jazyce

Charge transfer equilibrium in surface barrier discharge: continuous current and negative ion-driven ionisation wave

Popis výsledku anglicky

Sensitive measurements of very weak electrical currents in sinusoidally driven surface barrier discharge in atmospheric air are reported for discharge arrangements with and without liquid covering the top electrode. The transferred charge of the low-power discharge is carefully quantified and it is shown that after the complete voltage period the total charge balance is approaching zero. This rather obvious result is mechanically assumed in the literature, yet it is experimentally not understood in detail. We show that continuous and pulsed micro-ampere currents measured during the negative polarity are responsible for the gradual renewal of the charge transfer equilibrium abruptly distorted by strong electrical pulses caused by positive streamers during the opposite half-period. Using synchronised ICCD imaging we reveal that weak continuous current is caused by slowly expanding surface discharges stemming from previously established cathode spots. The expansion is caused by a surface ionisation wave. Based on the experimental evidence, supported by the theoretical results found in literature, we conclude that an expanding negative ion cloud is responsible for the electric field enhancement at its forefront which is sufficient to ionise the surrounding air.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PLASMA SOURCES SCIENCE and TECHNOLOGY

ISSN

0963-0252

e-ISSN

—

Svazek periodika

28

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

1-12

Kód UT WoS článku

000494437100004

EID výsledku v databázi Scopus

2-s2.0-85080067681