Phase stability in gyro-traveling-wave-tubes

Author

Nusinovich, G.S. ; Rodgers, J. ; Chen, W. ; Granatstein, V.L.

Author_Institution

Inst. for Plasma Res., Maryland Univ., College Park, MD, USA

Volume

48

Issue

7

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1460

Lastpage

1468

Abstract

This paper describes theoretical and experimental studies of the phase stability in frequency-multiplying gyro traveling-wave-tubes (gyro-TWTs). The theory is developed under assumptions that 1) an input waveguide operates in a small-signal regime; 2) a drift region is free of microwaves; and 3) an output waveguide can be analyzed in a specified current approximation. By using these assumptions, one can develop an analytical theory describing the phase sensitivity of frequency-multiplying gyro-TWTs. The calculations were done for the parameters of a frequency-doubling gyro-TWT which was studied experimentally. In the experiments, the beam voltage and magnetic field phase pushing factors were measured. The experimental results are in reasonable agreement with theoretical predictions. These results can be used for evaluating the restrictions on fluctuations in the beam voltage and current and the magnetic field which should be fulfilled for providing a required level of phase stability in gyro-TWTs

Keywords

frequency multipliers; gyrotrons; phase control; travelling wave tubes; beam voltage; current approximation; drift region; fluctuations; frequency-multiplying gyro traveling-wave-tubes; input waveguide; magnetic field phase pushing factors; output waveguide; phase sensitivity; phase stability; small-signal regime; Fluctuations; Frequency; Karhunen-Loeve transforms; Klystrons; Magnetic analysis; Magnetic field measurement; Millimeter wave communication; Stability; Voltage; Waveguide theory;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/16.930667

Filename

930667