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91.
带状电子注在螺线管磁场作用下传输时,易形成Diocotron不稳定性,导致电子注崩溃。采用Wiggler磁场聚焦带状电子注能防止Diocotron不稳定性。研究了Wiggler磁场聚焦带状注的作用机理,得出带状电子注在Wiggler场作用下的包络方程。结合理论分析,使用3维粒子模拟程序对带状电子注的Diocotron不稳定性和Wiggler磁场抑制不稳定性分别进行了模拟。研究表明:合适的选择磁场大小和周期能有效抑制Diocotron不稳定性,使得设计带状电子注行波管成为可能。 相似文献
92.
Radio-Frequency Characteristics of a Printed Rectangular Helix Slow-Wave Structure 总被引:1,自引:0,他引:1 下载免费PDF全文
A new type of printed rectangular helix slow- wave structure (SWS) is investigated using the field-matching method and the electromagnetic integral equations at the boundaries. The radio-frequency characteristics including the dispersion equation and the coupling impedance for transverse antisymmetric (odd) modes of this structure are analysed. The numerical results agree well with the results obtained by the EM simulation software HFSS. It is shown that the dispersion of the rectangular helix circuit is weakened, the phase velocity is reduced after filling the dielectric materials in the rectangular helix SWS. As a planar slow-wave structure, this structure has potential applications in compact TWTs. 相似文献
93.
The periodic nonuniform folded waveguides are special structures,
the physical dimension of which is between the periodic folded
waveguide and the tapering period folded waveguide. Therefore, the
synchronization between the microwave and the electron beam can be
maintained in the whole interaction process and the periods are not
tapered. In comparison with the tapering period folded waveguide,
the theoretical analysis and the technological requirements for this
structure are more convenient. In order to study this structure, the
space harmonics are analysed, the conditions to make the m-th
space harmonic synchronizing with the electron beam in the whole
interaction process are present, and the dispersion curve and the
coupling impedance curve are obtained by the simulation software
HFSS. 相似文献
94.
A period-varying folded waveguide is formed by varying the period of
a folded waveguide. It has the advantages of the space harmonic
selectivity and the wide bandwidth. However, the regularities of the
variety of these period-varying folded waveguides are unavailable
from the published papers. In order to solve this problem, the
principle of the space harmonic selectivity of a period-varying
folded waveguide is analysed, and the conditions to select the space
harmonic for this slow wave system are obtained. In addition, the
space harmonic selectivities for a linear period-varying folded
waveguide and a hyperbolic sine-varying period folded waveguide are
also analysed as examples. 相似文献
95.
In this paper, we present a design where a bunched relativistic
electron beam traversing inside the rectangular dielectric-loaded
(DL) waveguide is used as a high power microwave generation device.
Two kinds of methods of calculating the electromagnetic (EM) field
excited by a bunched beam are introduced, and in the second method
the calculation of EM pulse length is discussed in detail. The
desired operating mode is the LSM_11 due to its strong
interaction with the electron beam. For the designed 7.8~GHz
operating frequency, with a 100~nC/bunch drive train of electron
bunches separated by 0.769~ns, we find that high gradient
(>30~MV/m) and high power (>160~MW) can be generated. An output
coupler is also designed which is able to extract the generated
power to standard waveguides with a 94% coupling efficiency. 相似文献
96.
A slow-wave structure (SWS) with two opposite gratings inside a rectangular
waveguide is presented and analysed. As an all-metal slow-wave circuit, this
structure is especially suited for use in millimetre-wave travelling wave tubes
(TWTs) due to its advantages of large size, high manufacturing precision and good
heat dissipation. The first part of this paper concerns the wave properties of this
structure in vacuum. The influence of the geometrical dimensions on dispersion
characteristics and coupling impedance is investigated. The theoretical results show
that this structure has a very strong dispersion and the coupling impedance for the
fundamental wave is several tens of ohms, but the coupling impedance for --1 space
harmonic wave is much lower than that for the fundamental wave, so the risk of
backward wave oscillation is reduced. Besides these, the CST microwave studio is
also used to simulate the dispersion property of the SWS. The simulation results
from CST and the theoretical results agree well with each other, which supports the
theory. In the second part, a small-signal analysis of a double rectangular
waveguide grating TWT is presented. The typical small-signal gain per period is
about 0.45 dB, and the 3-dB small-signal gain bandwidth is only 4\%. 相似文献