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- W189191489 abstract "The behaviour of Mo, W and Cu with respect to electrical breakdown in ultra high vacuum has been investigated by means of a capacitor discharge method. The maximum stable electric field without breakdown and the field enhancement factor, β have been measured between electrodes of the same material in a sphere/plane geometry for anode and cathode, respectively. The maximum stable field increases as a function of the number of breakdown events for W and Mo. In contrast, no systematic increase is observed for Cu. The highest values obtained are typically 500 MV/m for W, 350 MV/m for Mo and only 180 MV/m for Cu. This conditioning, found for the refractory metals, corresponds to a simultaneous decrease of β and is therefore related to the field emission properties of the surface and their modification upon sparking. Accordingly, high β values and no applicable field increase occur for Cu even after repeated breakdown. The results are compared with RF breakdown experiments [1] performed on prototype 30 GHz accelerating structures for the CLIC accelerator." @default.
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- W189191489 date "2004-08-01" @default.
- W189191489 modified "2023-09-27" @default.
- W189191489 title "Breakdown resistance of refractory metals compared to copper" @default.
- W189191489 hasPublicationYear "2004" @default.
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