| Autor: |
de Esch, H. P. L., Simonin, A., Grand, C. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2015, Vol. 1655 Issue 1, p1-10, 10p, 1 Color Photograph, 2 Black and White Photographs, 1 Diagram, 5 Charts, 5 Graphs |
| Abstrakt: |
IRFM have conducted resilience tests on electrodes made of Cu, stainless steel 304L, Ti and Mo against breakdowns up to 170 kV and 300 J. The tests of the 10×10 cm² electrodes have been performed at an electrode distance d=11 mm under vacuum (P~5×10-6 mbar). No great difference in voltage holding between the materials could be identified; all materials could reach a voltage holding between 140 and 170 kV over the 11 mm gap, i.e. results scatter within a ±10% band. After exposure to ~10000 seconds of high-voltage (HV) on-time, having accumulated ~1000 breakdowns, the electrodes were inspected. The anodes were covered with large and small craters. The rugosity of the anodes had increased substantially, that of the cathodes to a lesser extent. The molybdenum electrodes are least affected, but this does not show in their voltage holding capability. It is hypothesized that penetrating high-energy electrons from the breakdown project heat below the surface of the anode and cause a micro-explosion of material when melting point is exceeded. Polished electrodes have also been tested. The polishing results in a substantially reduced breakdown rate in the beginning, but after having suffered a relatively small number (~100) of breakdowns, the polished electrodes behaved the same as the unpolished ones. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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