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The gyrotron backward-wave oscillator (gyro-BWO) is a frequency tunable scheme at millimeter/terahertz regime. The continuous frequency tuning can be achieved by varying either the magnetic field or the beam voltage in a non-resonant structure. With a growing interest in terahertz-wave regime, gyro-BWO should be preferably operated with high-order mode due to the power-handling capability. Then the...
The study conducts the reliability test of the flip chip ball grid array (FCBGA) components with both the cyclic bend tests and shear tests for three types of solder materials: the eutectic solder with compositions of Sn63Pb37, and the lead free solder with compositions of both SnAg3.0Cu0.5 and SnAg4.0Cu0.5. The final results for the cycles to failure data of different solder ball materials are plotted...
Stability issues have been a major concern for the realization of broadband tunability of the gyrotron backward wave-oscillator (gyro-BWO). A time-dependent code is employed to examine the stability properties of the gyro-BWO over a wide range in magnetic field and electron beam voltage. On the basis of the results, an optimized Ka-band gyro-BWO experiment has been designed and conducted. Continuous...
Axial modes of the gyro-BWO are characterized by a discrete set of optimum transit angles separated by ~2pi. We show in theory that, during the rise and fall portions of the beam pulse, the frequency of a given axial mode varies in such a way that its transit angle remains at the characteristic value of the mode. Furthermore, in this transient period, axial mode competition is governed by the distinctive...
Summary form only given. The injection locking technique has been applied on the experiment of gyrotron backward wave oscillator (gyro-BWO) for phase control and spectral purity. The efficiency of the gyro-BWO was considerably enhanced when it was locked by an injected signal, which has never been thorough examined in the locked oscillator. Therefore, the physics underpinning is still unclear. A stationary...
Summary form only given. We report the concept and development of a Ka-band two-port mode and polarization converter that efficiently converts a TE10 rectangular waveguide mode into either a linearly or a circularly polarized TE21 cylindrical waveguide mode. The converter is formed of a power-dividing section, a mode-converting section, and a polarization-transitioning section. The conversion process...
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