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Gyro-devices are fast wave devices based on the principles of the electron cyclotron maser1,2. Gyro-oscillators have been successfully developed in the form of gyrotrons3,4. Gyro-amplifiers have been studied for approximately as long as gyro-oscillators but in the early years the amplifiers exhibited stability issues. Gyro-amplifiers include broadband gyro-TWTs and the narrower band gyro-klystrons...
Gyrotrons find use in several diverse fields, ranging from plasma heating and plasma diagnostic to spectroscopy and materials processing. However, with demand for high power coherent radiation at THz frequencies, the confining magnetic fields required for gyrotrons operating at the fundamental harmonic become increasingly restrictive. However, considerable promise lies with the concept of the gyro-multiplier...
Linear and nonlinear behaviors of gyrotron backward wave oscillators (gyro-BWO) were investigated by both analytical theories and direct numerical calculations. Employing two-scale-length expansion, an analytical linear dispersion relation corresponding to absolute instabilities in a finite-length system has been derived. Detuning from the beam-wave resonance condition due to the finite amplitude...
Microwave pulse compression has applications in radar technology and plasma diagnostics. The pulse compressor requires a dispersion curve with a monotonic group velocity and low losses in a reasonable wide frequency band. It can be achieved by the helically corrugated waveguide (HCW) [1–3] with both axial and azimuthal periodicity that couples modes in the circular waveguide to generate new operating...
We are studying new concepts for remote detection of concealed radioactive materials.1–3 The research is a balanced effort consisting of theory, simulations and experiments.
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