Thermal design considerations for fast warm-up cathodes in MM wave magnetrons

Author

Dwivedi, H.K. ; Venkateswarlu, D.S.

Author_Institution

Central Electron. Eng. Res. Inst., Pilani, India

Volume

43

Issue

11

fYear

1996

fDate

11/1/1996 12:00:00 AM

Firstpage

2011

Lastpage

2018

Abstract

The paper discusses the thermal characteristics of various cathode structures for magnetrons using a computer code developed for this purpose. Methods for reducing warm-up time and input heating power for various oxide coated cathode configurations are suggested. A new “semi-indirectly heated” oxide coated cathode configuration with improved thermal characteristics is proposed. Materials with melting points less than that of conventional heater materials are considered for use in some configurations. The computed result of warm-up characteristics of directly heated cathode in actual thermal environment of millimeter wave magnetron is compared with experimental results and possible causes of disagreement between the two are discussed. Methods for improvement in temperature profiles of cathodes with large thermal loads are discussed

Keywords

magnetrons; millimetre wave tubes; oxide coated cathodes; MM wave magnetron; computer code; direct heating; melting point; oxide coated cathode; semi-indirect heating; temperature profile; thermal design; warm-up time; Assembly; Cathodes; Heating; Magnetic materials; Magnetrons; Millimeter wave technology; Nickel; Temperature; Thermal conductivity; Thermal loading;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.543040

Filename

543040