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A gyrotron was constructed with an inside quasi-optical system to convert the wave into gaussian beam. The experiments showed an output power of 23.9kW while the frequency was 95.1GHz, which was in accordance with the design. The threshold current and the output power under different parameters were measured, which showed some discrepancies at parts of the charts between the calculations and the experiments,...
Optimizing high-power ultrashort pulse amplifier using double-clad Yb-doped fiber, maximum output power of >3 W with a pulse width of 110 fs without pedestal component is obtained. Using this pulse, high-power high-efficiency broadband THz pulse generation is expected.
The design of a 340GHz two-beam folded waveguide (FW) traveling-wave amplifier with >4 W of power over with the input power of 20mW is presented. The amplifier is driven by two electron guns (70mA×2, 14.9kV) and 1T magnetic field. The design is performed by CST Particle Studio. Particle-in-cell (PIC) simulations were carried out to predict and optimize the performance of the folded waveguide TWT.
We present the demonstration of the first traveling wave tube circuit fabricated using ultraviolet photolithography. The complete amplifier demonstrated over 60 W output power at 214.5 GHz with 15 GHz bandwidth in the small signal regime at 14 dB gain. A high-gain 233 GHz amplifier is now under development and predicted to reach over 100 W output power. We present several microfabrication advancements...
In this paper, we present the particle-in-cell(PIC) simulation results of a novel Ka-band ring-shaped microstrip meander-line slow-wave structure(SWS). This study shows that, this miniature millimeter-wave power amplifier is capable of delivering an average output power greater than WOW within the bandwidth from 28 to 38 GHz, when the beam voltage and the beam current are 11411Vand 200mA, respectively.
A compact 140GHz 8-way power combing module is described using compositing integrated structure. For a unit of radial power combing, the width of the module subjects to severe limitations. We develop a step-by-step design procedure, including waveguide T-junction, hybrid based on waveguide directional coupler and distorted T-junction. For purpose of improving the gain of the module, a driving amplifier...
Backward wave oscillation modes in a TE01 Gyro-TWT are researched by a nonlinear theory with consideration of electrons misalign. The results show the output power of most oscillation modes decreases with the increment of misaligns distance.
For a G-band sheet beam extended interaction klystron (SBEIK), an eight-gap extended output cavity that operates in the 2π mode, is optimized by using an equivalent method, in which the external load is replaced by a lossy region in 3D particle-in-cell model. The optimized eight-gap extended output cavity has 681.9 unloaded Q, 952 external Q and 397.3 loaded Q at 220 GHz. The simulations based on...
In this paper we investigate the use of a photonic band-gap (PBG) structure in the design of a 94 GHz traveling wave amplifier. The proposed device has been designed with a large beam tunnel in order to accommodate a high current electron beam. CST Microwave Studio is used to solve the dispersion of the waveguide and simulate transmission of microwaves through a finite length section of the PBG waveguide...
Optimizing high-power ultrashort pulse amplifier using double-clad Yb-doped fiber, maximum output power of >3 W with a pulse width of 110 fs without pedestal component is obtained. Using this pulse, high-power THz pulse generation is measured by a pyroelectric detector with a low sensitivity.
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