1. (1) Y. Katsube : “The Elements and Design of X-Ray Generator”, Adv. X-ray. Chem. Anal., Jpn, Vol. 46, pp. 27-31 (2015) (in Japanese)
2. (3) R. Hackam and L. Altcheh : “AC (50 Hz) and DC electrical breakdown of vacuum gaps and with variation of air pressure in the range 10-9 - 10-2 Torr using OFHC copper, nickel, aluminum, and niobium parallel planar electorodes”, J. Appl. Phys., Vol. 46, No. 2, pp. 627-630 (1975)
3. (4) K. Minaminosono, Y. Yamano, S. Kobayashi, and Y. Saito : “Vacuum Breakdown Characteristics of Oxygen-Free CopperElectrodes with Different Keeping Methods and Terms”, Proc. 23rd Int. Symp. on Discharges and Electrical Insulation in Vacuum, pp. 227-230, Bucharest, Romania (2008)
4. (5) M. Sone, M. Sugino, Y. Toriyama, and H. Mitsui : “Study on Cleaning Effect of Copper Electrode Surface by Heat Treatment in Vacuum”, T. IEE Japan, Vol. 102-A, No. 3, pp. 141-148 (1982) (in Japanese)
5. (6) H. Okubo, K. Kato, Y. Fukuoka, Y. Inagawa, H. Saitoh, and M. Sakaki : “Breakdown Conditioning Characteristics of Precision-Surface-Treatment-Electrode in Vacuum”, IEEJ Trans. FM, Vol. 126, No. 8, pp. 763-768 (2006) (in Japanese)