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Suppression of backward–wave oscillation by filter helix methods
1955 Edition, Volume 2, April 1, 1955 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

An experimental study has been made of the filter helix properties of a periodically loaded helix, using a special traveling-wave tube. The filter helix is shown to possess filter-like frequency pass bands and stop bands and a phase...

Stability of gyro backward wave oscillation
2001 Edition, January 1, 2001 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Summary form only given, as follows. It was shown theoretically and experimentally that in a conventional slow wave backward wave tube, the oscillation is susceptible to self-modulation or choatic behavior when the beam current exceeds certain critical value. The...

Backward Wave Oscillation Thresholds in a Traveling-Wave Tube
2017 Edition, May 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The threshold for the onset of backward wave oscillation (BWO) in a traveling-wave tube (TWT) was formulated by Johnson [1]. In this paper, we extend Johnson's model to include random variations of circuit phase velocity along the tube axis. We find...

Magnetic Field Tapering Approaches for Backward-Wave Oscillation Suppression in Helix Traveling-Wave Tubes
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Two magnetic field tapering concepts for the suppression of backward-wave oscillations in helix traveling-wave tubes (TWTs) are presented. Therefore, the beam-wave interaction in a homogeneous helix section is modified. Increasing the...

On Johnson's backward wave oscillation thresholds in TWT
2018 Edition, April 1, 2018 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This work extends Johnson's classical theory [H. R. Johnson, Proc. IRE 43, 684 (1955)] for the threshold of backward wave oscillation (BWO) in a traveling-wave tube (TWT) by including (1) random variations of circuit phase velocity along the tube...

Backward-wave oscillation suppression in helix traveling-wave tubes by magnetic field tapering
2017 Edition, April 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Two techniques for suppressing backward-wave oscillations in homogeneous helix sections of traveling-wave tubes are presented. For this purpose, the focusing magnetic field is modified. The first technique aims at compressing the electron beam in order to...

Square-wave oscillations with different duty cycles
2011 Edition, May 1, 2011 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A fundamental property of nonlinear dynamical systems controlled by a delayed feedback is their tendency to exhibit 2τ -periodic square-wave oscillations of equal plateau lengths (τ is the delay) [1]. The question was recently raised whether an optical system...

Extensions of Johnson's Theory of Backward-Wave Oscillations in a Traveling-Wave Tube
Volume PP - IEEE - Institute of Electrical and Electronics Engineers, Inc.

This paper extends Johnson's classical theory [Johnson, Proc. IRE 43, 684 (1955)] for the threshold of backward-wave oscillation (BWO) in a traveling-wave tube by considering the effects of: 1) small random variations of the circuit phase...

Effect of attenuation on backward-wave oscillation start oscillation condition
2004 Edition, Volume 32, December 1, 2004 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

In a practical helix traveling-wave tube (TWT), there is always attenuator/sever for suppressing the oscillations, including backward-wave oscillation (BWO). The factors of the influencing BWO include start position of the attenuator, its...

Analysis of Backward Wave Oscillations for a Stable TWT Amplifier
2007 Edition, October 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Two wave theory (considering the forward slow wave and forward fast wave) has been used to calculate the velocity taper as a remedy for the higher pass band backward wave oscillations in a TWT. Such oscillations in fact are the main factor which...

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