Amplitude locking in a gyroTWT amplifier with a delayed feedback

Amit Kesar, David Blank, Eli Jerby

Research output: Contribution to journalArticlepeer-review


Enhanced pulsed output is observed in a delayed-feedback gyroTWT amplifier. The gyroTWT consists of a rectangular WR90 waveguide divided to three stages of amplification. The first and third stages are loss-less, in order to enhance electron-bunching and output power, respectively, while the second stage has distribution wall losses in order to prevent backward-wave instabilities. A low-voltage low-current electron-beam (18 kV, 0.3 A) interacts with the em wave. An external 60 ns delay line operating as a feedback couples the output power to the RF-input port, through a set of isolators, attenuators, and a fast RF-switch. The closed-loop gain is slightly above unity. The switch is modulated externally at a frequency rate inversely proportional to the feedback loop delay time. The experimental observations are supported by a time-dependent numerical computations.

Original languageEnglish
Article number180
Pages (from-to)188
Number of pages1
JournalIEEE International Conference on Plasma Science
StatePublished - 2002


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