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Laser air plasma expansion by microwaves
Applied Optics, 2023Utilizing microlasers and microwaves, our study examined the impact of microwaves on the expansion of air plasma. We applied microwaves to the air plasma generated by a microlaser, visualized its growth using a phone camera, and recorded plasma emissions using a high-resolution spectrometer.
Yuji Ikeda +3 more
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Journal of Applied Physics, 1965
Transmission characteristics of a rectangular waveguide with a perpendicularly inserted mercury-vapor discharge tube, have been measured. The waveguide was excited in the TE01 mode and the plasma column was either perpendicular or parallel to the electric vector of the waveguide mode.
B. Keržar, P. Weissglas
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Transmission characteristics of a rectangular waveguide with a perpendicularly inserted mercury-vapor discharge tube, have been measured. The waveguide was excited in the TE01 mode and the plasma column was either perpendicular or parallel to the electric vector of the waveguide mode.
B. Keržar, P. Weissglas
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IET Conference on High Power RF Technologies, 2009
A technique has been developed for melting holes in masonry as an alternative to conventional drilling. Microwaves are applied to a tungsten rod inside a section of waveguide, which is terminated by a short circuit. The rod protrudes from the waveguide, via a small hole, and is placed against the masonry to be drilled.
S.R. Wylie, A.I. Al-Shamma'a, A. Shaw
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A technique has been developed for melting holes in masonry as an alternative to conventional drilling. Microwaves are applied to a tungsten rod inside a section of waveguide, which is terminated by a short circuit. The rod protrudes from the waveguide, via a small hole, and is placed against the masonry to be drilled.
S.R. Wylie, A.I. Al-Shamma'a, A. Shaw
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1966 International Electron Devices Meeting, 1966
A low-loss, low-noise plasma varactor has been developed. This is a variable microwave reactance produced by means of a low pressure, highly efficient gas discharge. This device compares favorably with ferrite or semiconductor devices as far as rf losses and average rf power handling capability are concerned. A low-loss phase shifter has been developed
J.Y. Wada, R.C. Knechtli, B.J. Forman
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A low-loss, low-noise plasma varactor has been developed. This is a variable microwave reactance produced by means of a low pressure, highly efficient gas discharge. This device compares favorably with ferrite or semiconductor devices as far as rf losses and average rf power handling capability are concerned. A low-loss phase shifter has been developed
J.Y. Wada, R.C. Knechtli, B.J. Forman
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Microwave Diagnostics of Plasmas
IEEE Transactions on Nuclear Science, 1964The theory of wave propagation in plasma media where temperature and collision effects are important is formulated by combining the wave equation and Boltzmann's equation for average electron velocity. Usually it is assumed that the electron collision frequency is independent of velocity, but most gases are characterized by a velocity-dependent ...
R. W. Grow, C. C. Johnson, A. S. Jones
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Physics World, 1988
A plasma of easily-attained parameters could be used as a phase-conjugate reflector for subcentimetre electromagnetic (EM) waves, according to I. Nebenzahl of the Hebrew University, Jerusalem and colleagues at the University of California, Irvine (Phys.Fluids. 31 2144).
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A plasma of easily-attained parameters could be used as a phase-conjugate reflector for subcentimetre electromagnetic (EM) waves, according to I. Nebenzahl of the Hebrew University, Jerusalem and colleagues at the University of California, Irvine (Phys.Fluids. 31 2144).
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Nature, 1962
A striated r-f discharge in argon was produced by highpower, continuous- wave, 3.4-cm wavelength radiation focused into the central region of a discharge vessel. The conditions are approximates 2 kw source power and 40 to 100 mm Hg argon pressure, and the effects of varying the power and pressure are described. (D.L.C.)
J. ALLISON, A. L. CULLEN, A. ZÁVODY
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A striated r-f discharge in argon was produced by highpower, continuous- wave, 3.4-cm wavelength radiation focused into the central region of a discharge vessel. The conditions are approximates 2 kw source power and 40 to 100 mm Hg argon pressure, and the effects of varying the power and pressure are described. (D.L.C.)
J. ALLISON, A. L. CULLEN, A. ZÁVODY
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Measurements of plasma potential in high-pressure microwave plasmas
Review of Scientific Instruments, 2009Plasma potential of a high-pressure (∼1 Torr) microwave-generated argon plasma is measured using a Langmuir probe and a cold emissive probe. The operation of a hot emissive probe in a high-pressure plasma has been very difficult due to frequent burn-outs and significantly reduced lifetime of the probe filament, which, in turn, limits the possibility of
A V, Tarasova +2 more
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Microwave interactions with plasmas
IEEE Conference Record - Abstracts. 1996 IEEE International Conference on Plasma Science, 1996The physics of EM wave interactions with plasma with and without the confining magnetic field is presented. The plasma resonance enhances the incident field to large local values. The ponderomotive force of these enhanced electric fields create density perturbations.
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Plasma as a Microwave Amplifier
The Physics of Fluids, 1961A mechanism is postulated for which a streaming plasma may transmit energy to a traversing radiation field, and thereby enhance the signal. For a laboratory plasma, only resonance frequencies over a narrow band may be amplified by this method. Large amplification over a broad frequency range is postulated for an astronomical gas.
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