Accession Number : AD0629904

Title :   STUDY OF TRANSVERSE WAVE INTERACTIONS.

Descriptive Note : Quarterly rept. no. 1, 1 May-31 Jul 65,

Corporate Author : UTAH UNIV SALT LAKE CITY MICROWAVE DEVICE AND PHYSICAL ELECTRONICS LAB

Personal Author(s) : Schriever,R. L. ; Ahlquist,M. T. ; Durney,C. H. ; Johnson,C. C. ; Grow,R. W.

Report Date : OCT 1965

Pagination or Media Count : 47

Abstract : Experiments with a rotating electron beam waveguide device have been performed. The device used in this investigation has been found to exhibit a strong transverse wave interaction. The interaction takes place at a frequency which is close to the cyclotron frequency of the electron beam. Frequency measurements indicate that the interaction frequency is slightly less than the cyclotron frequency and that the interaction frequency varies inversely with beam voltage. Both gain and oscillation have been observed. The interaction appears to be of a backwardwave nature. The transverse-wave interaction theory indicates that backward-wave but not forward-wave active coupling may occur. The observed values of gain are less than the calculated values but are within an order of magnitude. The interaction is found to be strong at the cutoff frequencies. This is in agreement with the transverse-wave theory. The interaction appears to be greatly influenced by the reflections in the waveguide circuit. The results of this investigation indicate that strong transverse interactions can occur in fast-wave circuits. Succeeding experimental work will require a circuit which has better transmission over a broad frequency range. This could be easily accomplished with a broadband vacuum window. An improved beam launching system is still needed if beam parameter effects are to be more carefully observed. (Author)

Descriptors :   (*ELECTRON BEAMS, WAVEGUIDES), (*WAVEGUIDES, ELECTRON BEAMS), (*ELECTROMAGNETIC FIELDS, WAVEGUIDES), MICROWAVE EQUIPMENT, ELECTRON GUNS, ELECTRONS, CYCLOTRON WAVES, COUPLING CIRCUITS

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE