The importance of contamination in arc initiation on stainless steel exposed to a toroidal discharge
| Autor: | J.T. Maskrey, R.A. Dugdale |
|---|---|
| Rok vydání: | 1963 |
| Předmět: |
Nuclear and High Energy Physics
Argon Hydrogen Physics::Instrumentation and Detectors Metallurgy Electrical breakdown chemistry.chemical_element Cathode law.invention Arc (geometry) Electric arc Nuclear Energy and Engineering chemistry Physics::Plasma Physics Sputtering Impurity law General Materials Science |
| Zdroj: | Journal of Nuclear Materials. 10:233-242 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/0022-3115(63)90059-x |
| Popis: | Arc initiation on a commercial stainless steel at room temperature exposed to a toroidal hydrogen discharge has been investigated experimentally. The effect of impurity gases in the hydrogen and contamination on the surface of the steel have been studied. The addition of oxygen or nitrogen to the torus gas has no effect. It is found that arc initiation is entirely due to both organic and inorganic contaminants on the cathode surface. Under the particular electrical conditions involved (1 kV, 8 A/cm2) inclusions in the steel are ineffective arc initiators when the contaminants have been removed by arcing, prolonged sputtering with argon ions, or vacuum heat treatment. The results are discussed in relation to previous work, including studies of the glow to arc transition process, and it is considered that the role of contamination could be connected with either field emission or with a vapour puff produced by electrical breakdown of insulating particles or films. |
| Databáze: | OpenAIRE |
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