| Pulsed Magnetic Field Ferromagnetic Microwave Generator. |
APR 1969 |
73 pages |
| Authors:
L. D. Buchmiller; F. A. Olson; MICROWAVE ELECTRONICS PALO ALTO CA
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 | Engineering and packaging improvements to a prototype X-band nanosecond pulsed-ferrite generator are described. Project effort has included: Investigations for increasing power output through the use of multiple ferrite sphere-resonator configurations; Improved charged-line spark-gap pulsers for providing pulsed magnetic fields for mmultiple-sphere configurations; Investigation of solid-state switch capabilities for replacing the spark-gap switches now required for switching the charged-line pulsers; Construction and testing of the final, triggered, X-band generator with a ... |
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| PULSED MAGNETIC FIELD FERROMAGNETIC MICROWAVE GENERATOR. |
JUN 1968 |
36 pages |
| Authors:
L. D. Buchmiller; F. A. Olson; MICROWAVE ELECTRONICS PALO ALTO CA
|
| Methods of increasing the output power of the pulsed-ferrite X-band generator using multiple YIG ferrite spheres are described. A preliminary survey of solid-state switch capabilities is given for possible future replacement of spark-gap switches used in the charged-line pulser. Preliminary experimental work in triggering the nanosecond pulsewidth, spark-gap pulses is described. (Author) |
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| PULSED MAGNETIC FIELD FERROMAGNETIC MICROWAVE GENERATOR |
JAN 1968 |
25 pages |
| Authors:
L. D. Buchmiller; F. A. Olson; MICROWAVE ELECTRONICS PALO ALTO CA
|
| Measurements on the voltage-triggered spark gap show that excessive jitter is caused at high pulse repetition rates by the interaction of the trigger and pulser circuitry. Ultra-violet (U-V) triggered gaps will be used to minimize this interaction problem. A new method has been devised for obtaining increased power output using multiple YIG spheres in a distributed circuit configuration. A radial line transition between a 4-ohm coaxial line pulser and the ... |
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| PULSED MAGNETIC FIELD FERROMAGNETIC MICROWAVE GENERATOR. |
OCT 1967 |
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| Authors:
L. D. Buchmiller; F. A. Olson; MICROWAVE ELECTRONICS PALO ALTO CA
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 | Preliminary experiments with the modified pulsing technique were performed with only approximately one db increase in power output. However, the experiments are not considered conclusive due to equipment limitations. Various components were designed and constructed; these include: A voltage triggered spark gap installed in a coaxial line configuration; A U-V triggered spark gap using metal-ceramic construction; Trigger circuitry employing an SCR switch. (Author) |
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| PULSED MAGNETIC FIELD FERROMAGNETIC MICROWAVE GENERATOR |
AUG 1967 |
28 pages |
| Authors:
L. D. Buchmiller; F. A. Olson; MICROWAVE ELECTRONICS PALO ALTO CA
|
| Operating experience has been obtained with the Stanford Model II-B pulsed ferrite X-band generator. Preliminary pulser tests were performed with a commercially available voltage-triggered spark gap switch. A pulse rise time of one nanosecond at 10 kV was obtained at a pulse repetition frequency of 1000 Hz. |
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| STUDY OF MICROWAVE GENERATION USING DOUBLE-STREAM INSTABILITIES IN ANISOTROPIC MEDIA. |
FEB 1967 |
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| Authors:
L. D. Buchmiller; S. Kakihana; MICROWAVE ELECTRONICS PALO ALTO CA
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| Momentum relaxation times for hot electrons in individual valleys in germanium were calculated by extending the theory of Reik and Risken. The net growth rate was calculated for two-stream instability at 77 K for an applied electric field of 1000 V/cm. The damping of the plasma wave due to collisions of hot carriers in the valleys -2- through -4-, which provide shielding for the slow electrons in the first valley, ... |
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| STUDY OF MICROWAVE GENERATION UTILIZING DOUBLE-STREAM INSTABILITIES IN ANISOTROPIC MEDIA. |
OCT 1966 |
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| Authors:
L. D. Buchmiller; S. Kakihana; MICROWAVE ELECTRONICS PALO ALTO CA
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| The computer results for the two-stream instability in the (111) direction of n-type germanium for 77 K operation with an applied electric field of 1000 v/cm have been obtained. The instability frequency at the maximum growth rate is 27 GHz. However, the growth rate at 77 K is insufficient to overcome collisional damping. Experiments with bismuth using an InSb (Putley) submillimeter wave detector have resulted in observation of some low-level ... |
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| STUDY OF MICROWAVE GENERATION UTILIZING DOUBLE-STREAM INSTABILITIES IN ANISOTROPIC MEDIA. |
31 AUG 1965 |
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| Authors:
L. D. Buchmiller; S. Kakihana; MICROWAVE ELECTRONICS PALO ALTO CA
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| The possibility of two-stream instability in multivalley semiconductors such as silicon and germanium is of interest since the interaction is between light and heavy electrons rather than between electrons and holes. Dispersion relationships for longitudinal two-stream instability in the multivalley semiconductors, silicon and germanium, have been derived. It has been shown for silicon, in which the principal minima are located along the cube axes, that the optimum condition for the ... |
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| STUDY OF MICROWAVE GENERATION UTILIZING DOUBLESTREAM INSTABILITIES IN ANISOTROPIC MEDIA. |
01 MAR 1965 |
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| Authors:
L. D. Buchmiller; S. Kakihana; MICROWAVE ELECTRONICS PALO ALTO CA
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| Difficulties were encountered in obtaining a fast-response infrared detector for two-stream instabilities studies with pyrolytic graphite. A zinc-doped germanium detector appears to be the best detector available in the present state-ofthe-art and even with this detector the long wavelength cutoff is 40 microns, which falls short of the desired range of 5 to 75 microns. Experimental work was concerned principally with collective-phenomena instabilities in the solidstate plasma in n-type indium ... |
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