TY - JOUR
T1 - Amplitude locking in a gyroTWT amplifier with a delayed feedback
AU - Kesar, Amit
AU - Blank, David
AU - Jerby, Eli
PY - 2002
Y1 - 2002
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0036373234&partnerID=8YFLogxK
U2 - 10.1109/PLASMA.2002.1030412
DO - 10.1109/PLASMA.2002.1030412
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AN - SCOPUS:0036373234
SN - 0730-9244
SP - 188
JO - IEEE International Conference on Plasma Science
JF - IEEE International Conference on Plasma Science
M1 - 180
ER -