Dielectric materials for use as output window in high-power klystrons

Author

Michizono, S. ; Saito, Y. ; Yamaguchi, S. ; Anami, S. ; Matuda, N. ; Kinbara, A.

Author_Institution

Nat. Lab. for High Energy Phys., Tsukuba, Japan

Volume

28

Issue

4

fYear

1993

fDate

8/1/1993 12:00:00 AM

Firstpage

692

Lastpage

699

Abstract

The breakdown of RF windows used in high-power klystrons is one of the most serious problems in the development of klystrons. The durability of several dielectric materials used for RF windows is discussed in terms of secondary electron emission (SEE), cathodoluminescence, and dielectric loss. High-power tests of these materials with TiN coatings, thus having low SEE, were also carried out using a traveling wave resonant ring. The results show that alumina ceramics are superior to sapphire and aluminum nitride. The origin of breakdown is investigated, and the requirements for RF window materials are presented

Keywords

alumina; aluminium compounds; cathodoluminescence; dielectric losses; klystrons; secondary electron emission; titanium compounds; travelling-wave-tubes; RF windows; TiN-Al₂O₃; TiN-AlN; cathodoluminescence; ceramics; dielectric loss; dielectric materials; high-power klystrons; output window; secondary electron emission; traveling wave resonant ring; Coatings; Dielectric losses; Dielectric materials; Electric breakdown; Electron emission; Klystrons; Materials testing; Radio frequency; Resonance; Tin;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.231552

Filename

231552