Study of a 500-GHz Medium-Power Second-Harmonic Multiplying Gyrotron Traveling-Wave Amplifier With a Broad Frequency Range

A harmonic multiplying gyrotron traveling-wave amplifier (gyro-TWA) allows magnetic field reduction and frequency multiplication. This study presents a low-voltage, low-current, 500-GHz second-harmonic multiplying gyro-TWA that produces a medium power of ~10 W over a broad frequency range (~5 GHz)....

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Bibliographic Details
Published in:IEEE transactions on plasma science 2024-01, Vol.52 (1), p.46-53
Main Authors: Yeh, Yi Sheng, Li, Zong Ru, Pan, Yan Ru
Format: Article
Language:English
Subjects:
Broadband
Codes
Copper
Cyclotron resonance devices
Cyclotrons
Electron beams
Frequency conversion
Frequency ranges
Gyrotron traveling-wave amplifier (gyro-TWA)
Gyrotrons
Harmonic analysis
harmonic multiplying gyro-TWA
low current
low voltage
Magnetic fields
Multiplication
Oscillators
Quadratic equations
subterahertz
Traveling wave amplifiers
Traveling waves
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Summary:A harmonic multiplying gyrotron traveling-wave amplifier (gyro-TWA) allows magnetic field reduction and frequency multiplication. This study presents a low-voltage, low-current, 500-GHz second-harmonic multiplying gyro-TWA that produces a medium power of ~10 W over a broad frequency range (~5 GHz). An improved harmonic multiplying gyro-TWA featuring a distributed-loss structure achieves improved amplification performance and stability. Simulation results show that the involved spurious oscillations can be suppressed by high lossy-section resistivity, long lossy section, and short copper section. A tuned magnetic field is employed to achieve broadband frequency characteristics. The output power of the amplifier is a quadratic function of the input power. With a 12-kV, 0.3-A electron beam, the frequency range of the proposed amplifier is approximately 5 GHz for a 1-50-mW input power that can be provided by a 250-GHz commercial solid-state source.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2023.3345305