[IEEE Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum - Berkeley, CA, USA (1996.7.21-1996.7.26)] Proceedings of 17th International Symposium on Discharges and Electrical Insulation in Vacuum - Proceedings of the XVIIth International Symposium on Discharges and Electrical Insulation in Vacuum