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In this paper, the dumbbell resonant cavity frequency tuning method and beam wave interaction system of W band sheet beam Klystron (WSBK) has been studied. Under the designed value of beam voltage 75kV, beam current 3.8A, and beam size of 10*0.5 mm2, the structures and high frequency parameters of single gap and multi-gap cavities are tested and discussed to achieve the higher output power in detail...
The sheet beam klystron (SBK) is characterized by a large rectangular drift tube, which allows the use of a high current, low voltage beam, resulting in a low beam current density, and hence high efficiency and the possibility of Periodic Permanent Magnet (PPM) focusing. Our research group has designed a 5-Cavity X-Band SBK recently. In this paper, we discusses the general design of this X-Band SBK...
In this paper, the development of W-band sheet beam klystron has been introduced with high transmission rate beam and a 2-dimensional code SBK2D calculation. The ellipse cathode and electrode structure is used to form the sheet electron beam with the beam aspect ratio about 25:1. And the uniform magnetic system is used to transport the sheet electron beam with the drift tube length about 100mm. After...
At millimeter wavelengths, there is a growing need for a small size and weight, high average power RF source. The sheet beam klystron (SBK) is ideally suited to many of these needs. The SBK is characterized by a large rectangular drift tube, which allows the use of a high current, low voltage beam, resulting in a low beam current density, and hence high efficiency and the possibility of PPM focusing.
Simulations of the electron optics system and beam wave interaction system for W-band Sheet Beam Klystron (SBK) were done and a beam stick was fabricated. Under the beam voltage of 60 kV and current of 2.6 A, the beam transmission has achieved 99%. In this paper the results of both simulation and experiment are described.
In this paper, the design of input and output cavity for X-band sheet beam klystron was presented. The fabrication and cold test of a barbell cavity were conducted, and the cavity characteristics were predicted by both CST simulation and measurement.
A coaxial output cavity with reentrant ring and short circuit pole for multiple-beam klystron (MBK) is presented, which can increase the frequency interval between operating mode TM310 and neighboring modes to more than 1.0 GHz in X-band, diminish the external Q-factor from 535.4 to 202.2, and make the field distribution of TM310 mode symmetrical enough. The simulation results are obtained by CST-MWS.
The sheet beam klystron (SBK) uses a high aspect ratio, thin rectangular beam to reduce space charge effects, increase power capability and beam-wave interaction efficiency. In this paper, a Rod model for the sheet beam was studied, and a 2.5D large signal program based on this model was developed to calculate the beam-wave interaction of SBK.
In the late year, a sheet beam electron gun was designed and tested as the first step for the planned high power X-band sheet beam klystron. The primary design parameters of electron gun are as follows: beam voltage 300 kV, beam current 330 A, then the beam perveance is about 2.0 μp. According to the electric structure from simulation, a prototype gun is built and tested. The preliminary experimental...
In this paper, by means of a 3D particle-in-cell (PIC) code, the non-linear calculation of beam-wave interaction in periodic cusped magnetic (PCM) field is presented for the X-band sheet beam klystron with five three-cell, extended interaction cavities. The simulation results show that the output peak power is more than 32.4 MW, with the interaction efficiency of more than 31.2%, and the gain of more...
A spurious-mode-suppressing method is introduced in this paper, aiming at increasing frequency interval between operating mode (TM310 mode) and spurious mode (TM020 mode). By means of CST-MWS, we find that the frequency interval can be increased 0.65 GHz in X-band by the method.
As the RF structure to accomplish mode conversion in the system of pulse compression, the helically corrugated waveguides can operate in the frequency of millimeter wave with high gain and high efficiency. In the design of a high-power, broadband millimeter wave pulse compressor, the mode convert system is an important part. A compressor based on helically rippled waveguide is also described.
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