Title :
Liquid helium breakdown in terms of temperature and electrode roughness
Author_Institution :
Tech. Univ., Graz, Austria
Abstract :
DC-breakdown in near-saturated liquid helium is impeded by an effective barrier against bubble extension. The field strength needed for runaway up to a self-sustaining discharge has been calculated using an antibubble barrier model for various electrode surface roughness as in the temperature range 2.5-4.5 K. Cathode surface roughness has a dominant influence. A significant loss of stability has been found at very low temperatures, which makes surface asperities much more impairing
Keywords :
liquid helium; 2.5 to 4.5 K; DC-breakdown; He; bubble extension; cathode surface roughness; effective barrier; electrode roughness; electrode surface roughness; field strength; self-sustaining discharge; surface asperities; Cathodes; Electric breakdown; Electrodes; Helium; Rough surfaces; Stability; Surface discharges; Surface impedance; Surface roughness; Temperature distribution;
Conference_Titel :
Conduction and Breakdown in Dielectric Liquids,1993., ICDL '93., IEEE 11th International Conference on
Conference_Location :
Baden-Dattwil
Print_ISBN :
0-7803-0791-7
DOI :
10.1109/ICDL.1993.593949
