Investigation of arcing on fiber-formed nanostructured tungsten by pulsed plasma during steady state plasma irradiation

Arcing on fiber-formed nanostructured tungsten samples during ELM-like pulses was investigated using the superimposition of high power pulsed plasma on a steady state plasma with hydrogen gas in the linear plasma device Pilot-PSI. The ignition of arcing was observed when the floating potential of th...

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Bibliographic Details
Published in:Fusion engineering and design 2016-11, Vol.112, p.156-161
Main Authors: Yajima, M., Ohno, N., Kajita, S., De Temmerman, G., Bystrov, K., Bardin, S., Morgan, T.W., Masuzaki, S.
Format: Article
Language:English
Subjects:
Arc heating
Arcing
ELM
Fiber-formed nanostructure
Heat
Heat flux
Heat transfer
Hydrogen
Linear plasma device
Nanostructure
Nanostructured materials
Plasma physics
Sheaths
Steady state
Superposition (mathematics)
Transient heat load
Tungsten
Voltage drop
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Summary:Arcing on fiber-formed nanostructured tungsten samples during ELM-like pulses was investigated using the superimposition of high power pulsed plasma on a steady state plasma with hydrogen gas in the linear plasma device Pilot-PSI. The ignition of arcing was observed when the floating potential of the samples was less than −75V with sufficient heat flux. The surface observation showed that the arc spots were not in the center, but in the peripheral area of the plasma column. Considering the plasma potential profile in the Pilot-PSI, the arcing occurred at the position where the heat flux and the sheath potential drop are sufficiently large.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2016.07.026