Experimental investigation of a broadband two-stage tapered gyro-TWT amplifier

Author

Choi, J.J. ; Park, G.S. ; Park, S.Y. ; Armstrong, C.M. ; Kyser, R.H. ; Ganguly, A.K.

Author_Institution

Naval Res. Lab., Washington, DC, USA

fYear

1992

fDate

13-16 Dec. 1992

Firstpage

195

Lastpage

197

Abstract

A two-stage tapered gyro-TWT amplifier experiment operating in Ka-band is underway at the Naval Research Laboratory. The objective of this program is to demonstrate the stable wideband operation of a low voltage tapered gyro-TWT having high gain and good gain uniformity. Nonlinear calculations for a two-stage tapered device operating at 33 kV, 1 A with a peak alpha of 0.9 and a 2% velocity spread indicate a saturated gain of 30 dB with an efficiency of approximately 30% and an instantaneous bandwidth of 15%. In contrast with single stage operation, the amplification band is observed to be very sensitive to the beam velocity spread. A two-stage tapered gyro-TWT has been assembled and is presently under test. Initial results on amplifier stability are presented.<>

Keywords

gyrotrons; microwave amplifiers; stability; travelling-wave-tubes; 1 A; 30 dB; 33 kV; EHF; Ka-band; Naval Research Laboratory; SHF; amplifier stability; beam velocity spread; broadband; low voltage operation; stable wideband operation; tapered gyro-TWT amplifier; two-stage tapered device; Gyrotrons; Microwave amplifiers; Stability; Traveling wave tubes;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices Meeting, 1992. IEDM '92. Technical Digest., International

Conference_Location

San Francisco, CA, USA

ISSN

0163-1918

Print_ISBN

0-7803-0817-4

Type

conf

DOI

10.1109/IEDM.1992.307340

Filename

307340