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Circuit velocity step taper for suppression of backward wave oscillation in electron interaction devices

阅读:183发布:2022-11-16

专利汇可以提供Circuit velocity step taper for suppression of backward wave oscillation in electron interaction devices专利检索,专利查询,专利分析的服务。并且The output section of a helix type traveling wave tube or a transparent type traveling wave tube is provided with velocity step sections dimensioned so that a backward traveling circuit wave on the slow helix section synchronous with the slow space charge beam wave becomes synchronous with the fast space charge beam wave when traveling on the fast helix section. The step taper substantially suppresses backward oscillations which plague traveling wave tube devices. The phenomena provided by the structure of the invention is understood in terms of the coupled mode theory with particular attention to the Kompfner dip condition where the boundary conditions are such that the circuit voltages of the two half waves with different velocities add and the beam voltages cancel. All the RF energy then is transferred into the beam.,下面是Circuit velocity step taper for suppression of backward wave oscillation in electron interaction devices专利的具体信息内容。

1. A traveling wave electron interaction device comprising: circuit wave guiding structure for propagating electromagnetic energy having input and output coupling means; means for generating and directing an electron beam having slow and fast space charge wave components along a path adjacent to said circuit guiding structure to interact in an energy exchanging relationship with the propagating circuit waves; and means for substantially suppressing backward traveling circuit wave components having a predetermined natural oscillation frequency initiation determining length characteristic; said suppressing means comprising a circuit guiding structure having a slow and a fast velocity circuit section; said slow velocity circuit section being disposed closer to said output coupling means and having a length greater than said natural backward wave oscillation frequency length to result in a synchronous relationship of said backward wave components with said slow space charge beam wave; said fast velocity circuit section having a length shorter than said natural backward wave oscillation frequency length to result in a synchronous relationship of said backward wave components with said fast space charge beam wave; said slow and fast circuit sections being separated by an intermediate circuit section having a gradually varying velocity characteristic.
2. The device according to claim 1 wherein said circuit wave guiding structure input coupling means is separated from said suppressing means by an attenuator section.
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