| Issue |
EPL
Volume 131, Number 4, August 2020
|
|
|---|---|---|
| Article Number | 45002 | |
| Number of page(s) | 6 | |
| Section | Physics of Gases, Plasmas and Electric Discharges | |
| DOI | https://doi.org/10.1209/0295-5075/131/45002 | |
| Published online | 02 September 2020 | |
Mechanism of mass expulsion from the surface of a pure tungsten cathode during dc arc initiation
Joint Institute for High Temperatures of the Russian Academy of Sciences - Izhorskaya st. 13 Bd.2, Moscow, 125412 Russia
Received: 5 June 2020
Accepted: 17 August 2020
In this work the destruction mechanism of a pure tungsten cathode during the initiation of direct current arc is studied. The experimental work shows that the cathode resides in liquid form during the initiation of the arc, and the process of its destruction happens by ejecting droplets from its surface with the following explosion. The average speed of the ejection and the temperature at the explosion points microseconds before the explosion were registered. A mathematical model is proposed explaining the reason behind the droplets formation.
PACS: 52.40.Hf – Plasma-material interactions; boundary layer effects / 52.50.Dg – Plasma sources / 61.25.Mv – Liquid metals and alloys
© 2020 EPLA
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