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Friday, July 24, 2020 | History

2 edition of High power microwave discharges in resonant cavities found in the catalog.

High power microwave discharges in resonant cavities

James Harvey Dell

High power microwave discharges in resonant cavities

by James Harvey Dell

  • 124 Want to read
  • 13 Currently reading

Published .
Written in English

    Subjects:
  • Physics Theses

  • Edition Notes

    Thesis (M.A.), Dept. of Physics, University of Toronto

    ContributionsAnderson, J. M. (supervisor)
    The Physical Object
    Pagination76 p.
    Number of Pages76
    ID Numbers
    Open LibraryOL20844693M

    The resonant cavity, which is hollow and of the order of a few centimetres diameter, allows coupling of the microwave power into the plasma gas flowing through the capillary discharge tube. The microwave power supply operates at a frequency of GHz. Microwave plasmas can be produced at atmospheric pressure, if the design of the cavity allows. The triggering switch initiates the microwave dis-charge in the waveguide volume and its plasma forma-tion controls the phase of the wave reflected from the corresponding tee arm and consequently the resonant cavity mode of operation. The particular feature of high power RPC switches is their operation in an overvoltage when the micro-.

    microwave energy is applied in a resonant cavity appllcator and ]s absorbed by a plasma discharge in the flowing propellant. The ignited plasma acts as a lossy load, and with optimal tuning, energy absorption efficiencies over 95 percent (based on the applied microwave power) are expected. Nitrogen,File Size: 1MB. Evaluations for possible using of superconducting materials in high power microwave generators based on the method of the resonant microwave compression were made. As an example the relationship between the power amplification factor and frequency was determined for superconducting rectangular cavities. Capabilities of superconducting cavities as energy accumulators were : Sergey N. Artemenko, Valery L. Kaminsky, Gennady M. Samoylenko, Boris A. Alekseev.

    Microwave tubes are vacuum electron devices used for the generation and amplification of radio frequencies in the microwave range. An established technology area, the use of tubes remains essential in the field today for high-power applications. The culmination of the authorOCOs 50 years of industry experience, this authoritative resource offers you a thorough understanding of the operations. In this way, the resonant cavities are shown to have pulse shaping properties, with the photonic crystal cavity able to generate pulses with widths and delays ranging from tens of microseconds down to hundreds nanoseconds. A fluid plasma simulation was developed to model with high fidelity the transient dynamics of laboratory plasma discharges.


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High power microwave discharges in resonant cavities by James Harvey Dell Download PDF EPUB FB2

Figure 7 shows typical discharge waveforms of the microwave power, EUV intensity, and visible light. The microwave power was measured by an electric probe in the resonant cavity.

The signal was normalized by P net. A solid-state oscillator was used. The cavity mode was TE and the Xe gas pressure was ~2– : Saya Tashima, Masami Ohnishi, Waheed Hugrass, Keita Sugimoto, Masatugu Sakaguchi, Hodaka Osawa, Hiro. Resonant cavities; (a) Coaxial cavity, (b) Radial cavity, (c) Tunable cavity, (d) Toroidal cavity The principle, or fundamental, mode of oscillation of such cavity, and the one with the longest free-space wavelength, has electric and magnetic fields that do not depend on the azimuthal angle defining the half plane though both the axis and the Cited by: 2.

@article{osti_, title = {Resonant-frequency discharge in a multi-cell radio frequency cavity}, author = {Popovic, S and Upadhyay, J and Mammosser, J and Nikolic, M and Vuskovic, L}, abstractNote = {We are reporting experimental results on microwave discharge operating at resonant frequency in a multi-cell radio frequency (RF) accelerator cavity.

The Cavity Magnetron and Its Practical Signifi cance as a Major Innovation in T he industrial development of the cavity magnetron, and the subsequent development of high-power airborne and surface microwave radar, appear as a typical case of “major innovation,” i.e., according to the defi nition often used by.

Microwave discharges for excitation of CO/sub 2/ lasers have been investigated. A resonant microwave cavity ( GHz) has been employed to get high power TM/sub /-mode microwave excited high power CO/sub 2/ laser using a cylindrical resonant cavity - IEEE Journals & Magazine Skip to Main ContentCited by: Abstract: This paper presents the first experimental and theoretical investigation of high-power RF gas discharge as applied to RF front-end filters with critical air gaps in the 10s of μm.

Specifically, a strongly-coupled high-Q evanescent-mode resonant cavity is utilized as a vehicle in this study. This cavity tends to concentrate the resonant electric field in a small volume between its Cited by: A power supply in the radio frequency regime ( MHz) and another power supply in the microwave frequency regime ( GHz) are used to produce the plasma inside the cavity.

The effects of a time-varying complex dielectric constant upon the resonant characteristics of a cylindrical microwave cavity are presented. The cavity resonance equations are developed to consider the influence of small periodic changes in resonant frequency, bandwidth, and cavity-coupling coefficient upon the microwave power density within the cavity as a function of the probing microwave Cited by: 4.

Microwave discharges (MD) are widely used as a source of non-equilibrium low pressure plasma for different applications. This paper reviews the methods of microwave plasma generation at pressures from 10 −2 approximately to 30 kPa with centimeter–millimeter wavelength microwaves on the basis of scientific publications since up to the by: where (δf/f) is the ratio of the change in resonant frequency to the resonant frequency f o, and (Vo/Vc) the ratio of the empty cavity volume to the sample volume.

The constant C is a geometric factor, which is for rectangular cavities and for circular cavities. The Magnetron. The MAGNETRON, shown in figureview (A), is a self-contained microwave oscillator that operates differently from the linear-beam tubes, such as the twt and the klystron.

View (B)is a simplified drawing of the magnetron. CROSSED-ELECTRON and MAGNETIC fields are used in the magnetron to produce the high-power output required in radar and communications equipment.

The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field while moving past a series of open metal cavities (cavity resonators).Electrons pass by the openings to these cavities and cause microwaves to oscillate within, similar to the way a whistle produces a tone when excited by an air stream blown past its.

Following the design and development of efficient surface wave launchers [8], the systematic investigation of such discharges started at the end of the seventies. Nonetheless it is really in the eighties that SW discharges proved their remarkable potential for modelling high frequency plasmas in general [9] and also for applications [10].Cited by: It is presented in [26] that the EVA cavities are gas-discharge-free for operating at a W power level, indicating that this design is within the safe range of high-power operation.

The two-pole. Fixed and variable length re‐entrant resonant cavities designed for the measurement of dielectric constant and dissipation factor are described.

These cavities operate in the frequency decade of to cycles per second, a region avoided by many experimenters because the frequency is too high for the application of circuit techniques and not high enough for the convenient use of coaxial Cited by: microwave sources in the lower average powers, it seems unlikely they could achieve the power levels of interest for HPM sources and linear colliders.

Fig. Peak power vs. average power domains for microwave production [1]. Figure 2 illustrates the technical progress over several decades in the Pf 2 (power times frequency squared, also. A New Concept for High Power RF Coupling between Waveguides and Resonant RF Cavities Chen Xu1, *, Ilan Ben-Zvi1, 2, Haipeng Wang3, Tianmu Xin1, and Liling Xiao4 Abstract|Microwave engineering of high average-power (hundreds of kilowatts) devices often involves a transition from a waveguide to a device, typically a resonant by: 1.

This book offers a broad coverage of the theory and practice of industrial microwave heating. It introduces the physical processes behind dipolar and conductivity loss mechanisms and follows with a thorough presentation of dielectric property data of many industrial materials as a function of the moisture content, temperature and frequency, focussing on the interpretation of such data as 5/5(2).

Resonant Cavities and Waveguides 12 Resonant Cavities and Waveguides This chapter initiates our study of resonant accelerators., The category includes rf (radio-frequency) linear accelerators, cyclotrons, microtrons, and synchrotrons. Resonant accelerators have the following features in common: 1.

Applied electric fields are harmonic. Mehrdad Mehdizadeh, in Microwave/RF Applicators and Probes (Second Edition), Cavity resonators as applicators or probes. Resonant cavities are metal-enclosed resonant structures [13–15], where the dimensions are comparable with, or larger than, the operating such, practical cavities are almost exclusively operated at microwave frequencies ( MHz to 30 GHz), where.

This paper introduces a new concept in the detection and monitoring of the electric field intensity in high power microwave cavities. It is proposed that the optical emission intensity of a low-pressure gas plasma discharge can be used to describe the strength of the microwave electric field that is powering the : Ahmed Al-Shamma'a, Colin Fitzpatrick, Jim Lucas, Ionnais Pandithas, Elfed Lewis.Abstract.

This paper introduces a new concept in the detection and monitoring of the electric field intensity in high power microwave cavities. It is proposed that the optical emission intensity of a low-pressure gas plasma discharge can be used to describe the strength of the microwave electric field that is powering the : Ahmed Al-Shamma'a, Colin Fitzpatrick, Jim Lucas, Ionnais Pandithas, Elfed Lewis.With these parameters, at Ghz microwave frequency the ratio of plasma frequency to microwave angular frequency in the active portion of the discharge is greater than one, and may be as high Cited by: