Title :
Prebreakdown light emission in liquid helium
Author :
Hirata, K. ; Kaneko, S. ; Yamazawa, K. ; Yamashita, H.
Author_Institution :
Dept. of Electron. & Electr. Eng., Keio Univ., Yokohama, Japan
Abstract :
In this paper, the observation results of the prebreakdown light emission phenomena under divergent fields in liquid helium are reported. Two structures of light emission, filamentary and bush-like, were found for both positive and negative polarities. Most of the negative light emission should a filamentary structure, while it was a bush-like one for the positive. Light emission appeared for only a few microseconds for negative needle, while it lasts much longer than 25 μs for positive needle. The pulse frequency of the light emission differed between the polarities
Keywords :
electric breakdown; electroluminescence; liquid helium-4; 25 mus; He; bush-like structure; divergent fields; filamentary structure; liquid helium; negative needle; negative polarities; positive needle; positive polarities; prebreakdown light emission; pulse frequency; Cameras; Cryogenics; Electric breakdown; Electrodes; Helium; Insulation; Liquids; Needles; Pulse measurements; Voltage;
Conference_Titel :
Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on
Conference_Location :
Toyohashi
Print_ISBN :
4-88686-050-8
DOI :
10.1109/ISEIM.1998.741731
