Noise transport in the crossed-field diode

Pollack, M.A.; Whinnery, J. R.

doi:10.1109/t-ed.1964.15292

Cited by 21 publications

(2 citation statements)

References 18 publications

(13 reference statements)

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“…near the cathode resulted in larger output when the heater current was increased; there was no appreciable change in the cathode current (Wadhwa 1962). Later studies have revealed that this hypothesis on noise under spacecharge limitation was based upon incomplete evidence. The results of the Monte-Carlo techniques (Wadhwa and Rowe 1963, Pollack and Whinnery 1964) revealed that the behaviour of the potential minimum in a crossed-field device is similar to that in an O-type device (similar results were also found by Van Duzer and Whinnery (1961)) and that one should also expect space-charge smoothing in crossed-field guns. These predictions t Communicated by the Author.…”

Section: Introductionsupporting

confidence: 60%

Noise Transport in an Injected-beam Crossed-field Device†

Wadhwa

1967

International Journal of Electronics

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The various beam fluctuations at the gun exit of a crossed-fleld device are used to determine the excitation of the various modes. (These fluctuations at the gun exit are computed by transforming the fluctuations at the cathode surface by a method mentioned in the paper but discussed in detail elsewhere.) The excitation of the various modes is associated with the equivalent voltage of the corresponding mode. Noise-figure calculations are made, both under five-mode and three-mode excitation. For the three-mode-excitation case the two cyclotron 'modes are neglected. The computed results are compared with the experimental results. It is found tha.t the noise-figure value goes down as the beam is brought close to the delay line. For operation of the gun under different optimum conditions (keeping V acclB2 = constant) the noise-figure value does not seem to change appreciably as found from experiments.

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Section: Introductionsupporting

confidence: 60%

Noise Transport in an Injected-beam Crossed-field Device†

Wadhwa

1967

International Journal of Electronics

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“…Low-noise traveling-wave tubes now have typical noise figures of 5 dB at 8-12 GHz, 7 dB at 12-18 GHz, and 16 dB at 78 GHz, with lower values for some frequencies when liquid nitrogen cooling is employed. Very great advances have been made in the under· standing of the factors that affect noise in crossedfield amplifiers [W adhwa and Rowe, 1963;Pollack and Whinnery, 1964;Mantena and Van Duzer, 1964] and a 3.5-dB noise figure forward-wave · amplifier was demonstrated by Wadhwa and VanDuzer [1965]. An essential is the design of the gun for laminar electron flow and proper injection into the interaction region.…”

Section: Low-noise Microwave Amplifiersmentioning

confidence: 99%

U.S.A. National Committee Report, Fifteenth URSI Assembly, Munich, September 1966: Radio Electronics; Progress in Radio Electronics

Heffner¹,

Gould²,

Siegman³

et al. 1966

Radio Science

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The generation of new laser devices, techniques, ideas, and applications continued at an unslowing pace during 1963–1966. While no large‐scale or commercially important laser applications have yet emerged, lasers have found innumerable and often irreplaceable applications both in science and in technology. Increasing numbers of useful commercial applications are slowly beginning to emerge at the end of the period.

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