RESEARCH ON NOISE IN CROSSED FIELD DEVICES.
Abstract
The program of work was to develop a C.W. TPOM in order to study noise and spurious oscillations, seeking especially to reduce the amplitude of these parasitic phenomena. The first object was to realize a linear L-band tube of an experimental type, with the following features: 20 dB gain for a current of about 100 mA; applied power up to 1 kW; delay ratio of the order of 20. Two sorts of lines were studied: an interdigital line working on the direct space harmonic m=+1, and a meander line brazed on alumina slabs. It was found that the meander line has some obvious advantages as compared to the interdigital line: the band width is wider; coupling resistance is higher, with a smaller variation over the band; matching is easier; coupling to the fast mode is much lower; but attenuation is greater. Experimental study of the noise figure was carried out on two types of guns: a short space charge gun, and a gun with a screen-grid over cathode. In the first case, the noise figure is high and increases rapidly with current. The screengridded gun has a lower noise figure, of the order of 50 dB. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1964
- Accession Number
- AD0602261
Entities
People
- F. Diamand