BASIC MICROWAVE RESEARCH. Scientific Report No. 17. Quarterly Report No. 10 for July 1, 1959 to September 30, 1959
Research carried out in microwave tubes, plasma physics, and ferrite nonlinear microwave propagation at Stanford University is reported. (l) Microwave tubes. Work was done on the theory of coupled cavities by application of equivalent circuit methods to slow-wave microwave structures. The behavior of velocity-modulated electron beams in long gaps was investigated; methods for increasing bunching efficiency are described. Resonant helixes were studied in order to understand electron beam parametric amplification, and amplification using pumps is suggested. (2) Plasma physics. The purpose of this research is to understand propagation of electromagnetic waves through plasmas. Equations were derived for a finite electron beam in a finite plasma column with and indicate that attenuation of electron waves is proportional to the square rcct of the electron temperature. A new method for the elimination of standing waves on the plasma column is described. A plasma guide system 1 inch in diameter was constructed for measuring nonlinear effects in a parametric amplifier; a pole piece enables it to confine the plasma over a longer length. Attempts were made to measure electrostatic sound waves and indicate that fast electron waves, but not ion waves, are present. Sturrock's pseudo-confinement theory was tested for its low-frequency cutoff (below which no amount of r-f power can prcduce confinement) and for the potentials on the inner wall; in both tests, the results confirmed the theory. Experiments were made to produce thermal plasma (with equal electron and ion temperatures) with a traveling-wave tube, but no thermal plasma was detected. A method for producing a thermal cesium plasma to be tried is described. Methods for obtaining plasma information by two-frequency correlations in plasma noise are being studied. Harmonicfrequency generation experiments in plasma done in the past are analyzed, and it is believed that harmonic generation arises from the a-c currents nonproportionality to the a-c fields and that experiments in which r-f power is not wasted in plasma ionization are more suitable for studies of harmonic generation. (3) Ferrite nonlinear microwave propagation. The theory of frequency doubling in ferriteloaded propagating structures was studied using perturbation analysis. (D.L.C.)
- Research Organization:
- Stanford Univ., Calif. Microwave Lab.
- DOE Contract Number:
- AF19(604)-1930
- NSA Number:
- NSA-14-019551
- OSTI ID:
- 4182066
- Report Number(s):
- ML-662; AFCRC-TN-60-101; AD-23
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BACKGROUND- ELECTROMAGNETIC WAVES- FREQUENCY- MEASURED VALUES- MICROWAVES- PERFORMANCE- PLASMA
CAVITIES- CIRCUITS- COUPLING- ELECTRON TUBES- INTERACTIONS- MICROWAVES- NUMERICALS
ELECTROMAGNETIC WAVES- ELECTRON BEAMS- EQUATIONS- MAGNETIC FIELDS- MICROWAVES- NUMERICALS- PLASMA
ELECTROMAGNETIC WAVES- ELECTRONS- LOSSES- MEASURED VALUES- MICROWAVES- PLASMA- TEMPERATURE
ELECTROMAGNETIC WAVES- ELECTROSTATICS- IONS- MEASURED VALUES- MICROWAVES- PLASMA- SOUND
ELECTROMAGNETIC WAVES- MICROWAVES- PERFORMANCE- PLASMA- WAVE FORMS