Dielectric-loaded wideband gyro-TWT
Dielectric-loaded wideband gyro-TWT
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DOI：
10.1109/27.142819
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发表时间：
1992-06
影响因子：
1.5
通讯作者：
K. Leou;D. Mcdermott;N. Luhmann
中科院分区：
文献类型：
--
作者：
K. Leou;D. Mcdermott;N. Luhmann
The bandwidth of a gyro-TWT (traveling-wave tube) can be widened by employing a dielectric-loaded waveguide to reduce the circuit's dispersion. Fast wave interaction allows the requirements on the beam's quality to be relaxed compared with slow wave interaction. A low- alpha ( identical to nu /sub perpendicular to // nu /sub z/) electron beam is chosen to avoid the absolute instability and minimize the possibility of dielectric charging. This device is investigated using a self-consistent single-mode, large-signal simulation based on a slow time scale formulation. Simulation results show that a constant drive bandwidth of 20% can be achieved for a 100 kV, 5 A electron beam with a velocity ratio of alpha =0.59 and an axial velocity spread of 2.0%. The growth rate is relatively low because of the low alpha of the electron beam. The design of a proof-of-principle experiment is described. The tube is expected to deliver a power of 80 kW from 9 to 11 GHz with 15% efficiency and a saturated gain of 30 dB. The performance of a single-anode magnetron injection gun designed to produce the required high-quality electron beam has been studied through simulation. >
