Title :
High voltage DC breakdown initiation of cleaned vs. non-cleaned 304 LMC and 304 L stainless steel electrodes
Author :
Dolak, M. ; Garbini, L. ; Green, M.
Author_Institution :
Microwave Power Products Div., Commun. & Power Ind. Inc., Palo Alto, CA, USA
Abstract :
The effect of surface contamination, material grade and surface finish on high voltage DC breakdown has been investigated. A simplified parallel plane gap test geometry has been used to model the electron gun structure in the VA-889F klystron. This klystron has exhibited arcing between the stainless steel focus electrode and copper anode during in-process high-pot testing to 50 kV DC. The anode of the test geometry consisted of a 1.5" diameter OFHC copper plate machined to a 63 surface finish (R/sub a/ = 1.6 /spl mu/m) The cathode consisted of various test coupons of 0.25" in diameter with a 0.05" radius applied to the edge to minimize field enhancement.
Keywords :
electrodes; electron guns; electron tube testing; klystrons; surface contamination; 0.25 in; 1.5 in; 50 kV; DC breakdown initiation; VA-889F klystron; arcing; electron gun structure; field enhancement; in-process high-pot testing; material grade; parallel plane gap test geometry; stainless steel electrodes; surface contamination; surface finish; test coupons; test geometry; Anodes; Breakdown voltage; Copper; Electrons; Geometry; Klystrons; Solid modeling; Surface contamination; Surface finishing; Testing;
Conference_Titel :
Vacuum Electronics Conference, 2000. Abstracts. International
Conference_Location :
Monterey, CA, USA
Print_ISBN :
0-7803-5987-9
DOI :
10.1109/OVE:EC.2000.847537
