Accession Number : AD0012828


Title :   MODE CONTROL AND OPERATING VOLTAGES OF INTERDIGITAL MAGNETRONS


Descriptive Note : Technical rept.


Corporate Author : HARVARD UNIV CAMBRIDGE MA CRUFT LAB


Personal Author(s) : Singh, Amarjit


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/012828.pdf


Report Date : 05 May 1953


Pagination or Media Count : 24


Abstract : Studies were made controlling the frequencies of all the modes up to the second order, and investigations were made to study the electronic operation of first- and second-order modes. Experiments with operating tubes show that under given conditons, the first- and second-order modes can operate at more than 1 voltage. The different voltages can be attributed to the excitation of different Fourier components of the field configuration. Variation of resonance frequency of modes of different orders with changes in resonator parameters was studied by using a demountable resonator. It was indicated that an increase of cavity radius reduces the resonance frequency and increases the separation of the different modes; the ratio by which the resonance frequency changes for a given variation of cavity radius is smaller for the higher-order modes. An increase of radial thickness of the fingers, or a decrease of the separation between fingers, reduces the resonance frequency. A mode of separation of the order of 40% is obtained by choosing the ratio of cavity radius to anode radius to be 3:1. Sensitive control over the various modes can be obtained by introducing radial vanes in the cavity. The degenerate pairs of modes can be separated out, and the modes can be accurately located at equal intervals of the radial penetration of the vanes is chosen properly.


Descriptors :   *MAGNETRONS , RATIOS , THICKNESS , PARAMETERS , CAVITIES , SENSITIVITY , VARIATIONS , RESONANT FREQUENCY , CONFIGURATIONS , RESONATORS , RADIUS(MEASURE) , FOURIER ANALYSIS , ANODES , CONTROL , ELECTRONICS


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE