WorldCat Identities

Dazey, M. H.

Overview
Works: 7 works in 9 publications in 1 language and 33 library holdings
Roles: Author
Classifications: QC718,
Publication Timeline
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Most widely held works by M. H Dazey
The use of low impedance transmission lines in plasma heating and confinement studies by M. H Dazey( Book )

2 editions published in 1960 in English and held by 3 WorldCat member libraries worldwide

The neutron producing mechanism in transverse pinches by Vernal Josephson( Book )

2 editions published in 1960 in English and held by 3 WorldCat member libraries worldwide

A Loop Antenna for a VLF (Very Low Frequency) Satellite Transmitter( Book )

1 edition published in 1985 in English and held by 1 WorldCat member library worldwide

The Space Sciences Laboratory of The Aerospace Corporation is currently defining an experiment to test a loop antenna configuration as a very low frequency (VLF) transmitter in the ionosphere. The experiment is sponsored by the Naval Air Systems Command. The primary objectives of the experiment are to validate existing models for radiation by a loop antenna and to study the performance of the antenna in the ionospheric plasma. The antenna will be carried into orbit in the payload bay of the Space Shuttle. During the radiation tests it will be deployed above the payload bay by the remote manipulator system. A VLF receiver aboard a subsatellite will be used to map the radiation pattern of the antenna by measuring the field intensities at distances of 1 to 100 Km from the transmitter. Calculations predict that the antenna impedance will only be slightly modified by the plasma and that the link to the receiver can be closed at distances well beyond 100 km. A one-third scale model of the antenna has been constructed. Impedance measurements have been made on the model in a 5-m diameter space plasma simulation chamber at NASA Lewis Research Center. The measurements confirm that the reactance of the antenna in an ionospheric plasma is essentially identical to its free space self-inductance. The effective series resistance of the circuit increases with frequency. The losses are attributed to power transferred to plasma turbulence. Keywords include: Antenna impedance, Magnetic antenna, Plasma, and Satellite VLF transmitter
AC STABILIZED THETA PINCH( Book )

1 edition published in 1963 in English and held by 1 WorldCat member library worldwide

An attempt was made to demonstrate the dynamic AC stabilization of the magnetic confinement of a plasma column in a theta-pinch apparatus capable of producing 250kA. The stabilizing current was produced by the damped oscillating discharge of a specially fabricated 115 kV capacitor. No stabilizing effect was observed. Spectroscopic studies of the plasma, including measurements of the ratio of the intensity of the D sub beta Balmer line to the intensity of the continuum, yielded values for the electron temperature and electron (ion) density. An account is given of attempts to develop a vacuum tube oscillator capable of producing stabilizing currents of the desired magnitude. The reasons for the abandonment of the effort are given
A Controlled VLF Phase-Reversal Experiment in the Magnetosphere( Book )

1 edition published in 1976 in English and held by 1 WorldCat member library worldwide

During the 1973 operations of the transportable very-low-frequency (TVLF) transmitter near Anchorage, Alaska (L approx. 4), an experiment was performed to determine the effect of controlled phase changes of the transmitted wave on the magnetospherically propagated signal received in the conjugate region. At periodic intervals, the phase of the driving voltage was changed (essentially instantaneously) by 180 deg. The amplitude of the 6.6 kHz signal detected in the conjugate region went to zero and recovered with a characteristic time constant of 33 msec. This is ten times longer than the antenna current response time and is in fact comparable with characteristic electron interaction times with whistler-mode waves. Between the times at which the phase reversals occurred, the received signal was amplitude modulated. The period of the modulation was about 26 msec. An upper sideband was present in the spectrum while these pulsations were occurring. These characteristic times are in general agreement with theoretical predictions of bandwidths, growth rates, and particle trapping frequencies for whistler instabilities in the magnetosphere. Data obtained from the controlled transmissions and from lightning generated whistlers propagating in the same duct were combined to determine the plasma and wave parameters at the geomagnetic equator. Of particular interest is the level at which the magnetic field of the wave saturated. During the time period for which the data were analyzed, this was found to be 3.5 pT. (Author)
Kafjord, Norway Transmission Line VLF Antenna Tests, 1979-1980( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

The 100-kW Transportable Very-Low-Frequency (TVLF) system was used at Kafjord, Norway, for transmissions to the SCATHA and GEOS spacecraft. A 22-kV 14-km long transmission line was used as an antenna. Modifications were made in the line to reduce telephone interference, and components were designed and installed to reduce the resonant frequency and increase the antenna current. Final practical operating current was 40 amperes at 1280 Hz, which resulted in power dissipation of 72 kW and an estimated radiated power of 29 watts. (Author)
Impedance Measurements on a VLF Multi-Turn Loop Antenna in a Space Plasma Simulation Chamber( Book )

1 edition published in 1984 in English and held by 1 WorldCat member library worldwide

The Space Sciences Laboratory of The Aerospace Corporation is presently defining an experiment to test a loop antenna configuration for a VLF transmitter in the ionosphere. The primary objectives of the experiment are to validate existing models for radiation by a loop antenna and to study the performance of the antenna in the ionospheric plasma. A one-third scale model of the antenna has been constructed. Impedance measurements have been made on the model in a 5-m diameter space plasma simulation chamber at NASA Lewis Research Center. The measurements confirm that the reactance of the antenna in an ionospheric plasma is essentially identical to its free space self inductance. The effective series resistance of the circuit increases with frequency. The losses are attributed to power transferred to plasma turbulence. (Author)
 
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