Accession Number : AD0806536

Title :   RESEARCH ON CROSSED-FIELD ELECTRON DEVICES.

Descriptive Note : Final rept. 1 Sep 62-15 Sep 66,

Corporate Author : MICHIGAN UNIV ANN ARBOR ELECTRON PHYSICS LAB

Personal Author(s) : DeMassa, T. A. ; Khandelwal, D. D. ; Lele, S. G. ; Masnari, N. A. ; Morman, K. F.

Report Date : DEC 1966

Pagination or Media Count : 31

Abstract : Experimental S-band amplifier investigations have resulted in a maximum electronic gain of 31 db in a narrow frequency range for the abbreviated Kino gun system. Noise figure measurements indicated that the noise figure increased with current from 25 db at 10 ma to 45 db at 200 ma. Spurious oscillations have been detected in the drift region even under d-c conditions with no r-f circuit present. The noise investigations have indicated that space-charge smoothing occurs for several different types of guns. The point at which the plasma frequency and cyclotron frequency are equal results in a peak value for the Self-Power Density Spectra of the noise fluctuations. Experimental results indicate that the gun operating parameters and beam velocity influence the signal (noise) transport along the beam. The emitting-sole amplifier investigation indicates that moderate gain can be achieved by operating at low magnetic fields. The gain is also observed to increase as beam current and secondary emission increase, or when a linear taper in magnetic field is introduced. The experimental beam analyzer has been modified in an attempt to investigate the velocity distribution of electrons in the beam. An r-f system has also been designed to facilitate investigation of the space-charge flow in the presence of r-f fields. (Author)

Descriptors :   *ELECTRON MULTIPLIERS), (*CROSSED FIELD DEVICES, AMPLIFIERS, S BAND, ELECTRON GUNS, DIRECT CURRENT, ELECTRON BEAMS, GAIN, MAGNETIC FIELDS, SPACE CHARGE, OSCILLATION, PLASMAS(PHYSICS), CYCLOTRON WAVES, SECONDARY EMISSION, NOISE(RADIO), ELECTRIC FIELDS, MONTE CARLO METHOD, THERMIONIC EMISSION, HEAT TRANSFER, ANODES(ELECTRON TUBES), THEORY, CIRCUITS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE