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Tuesday, August 11, 2020 | History

2 edition of Technical characteristics of a novel helical-groove traveling-wave tube structure found in the catalog.

Technical characteristics of a novel helical-groove traveling-wave tube structure

Technical characteristics of a novel helical-groove traveling-wave tube structure

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Published by National Aeronautics and Space Administration, Lewis Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], Springfield, VA .
Written in English

    Subjects:
  • Frequency ranges.,
  • Computer programs.,
  • Cylindrical bodies.,
  • Traveling wave tubes.,
  • Waveguides.

  • Edition Notes

    StatementThomas M. Wallett ... [et al.].
    Series[NASA technical memorandum] -- NASA/TM-1998-207414., NASA technical memorandum -- 207414.
    ContributionsWallett, Thomas M., Lewis Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15541844M

    We demonstrate the epitaxial growth of high quality crystalline phase-pure NbO2 films on various oxide substrates using molecular beam epitaxy. Using a combination of reflection high-energy electron diffraction and x-ray diffraction we show that the films grow with the pseudo-rutile () orientation out of plane. The band gap of the NbO2 films is determined to be at least eV Cited by:   In this book he reveals the methodology, the common ratios that link different parts of the wave structure and provides a wealth of examples to explain his findings. Through this methodology he shows how waves develop and dispels the misconceptions that have been common practice by Elliotticians over the s: 9.

    In a phase change memory the device resistance corresponding to the amorphous phase monotonically increases with time after the reset programming operation. This phenomenon, called drift, affects the stability of the high resistive state, namely the reset state. In this work we investigate the resistance-drift process through ellipsometric measurements as a function of Cited by: ELSEVIER Journal of Non-Crystalline Solids () Working hypothesis to explore novel wide band gap electrically conducting amorphous oxides and examples Hideo "osono a'b' *, Naoto Kikuchi a, Naoyuki Ueda b, Hiroshi Kawazoe Tokyo Institute of Technology, Research Laboratory of Engineering Materials, Nagatsuta, Midori-ku, Yokohama , Japan h Cited by:

    SHOCK TUBE TECHNIQUES AND INSTRUMENTATION Paperback – by Harry J. Davis (Author) See all formats and editions Hide other formats and editions. Price New from Used from Paperback "Please retry" $ $ $ Paperback $ 2 Used from $ 1 New from $ Author: Harry J. Davis. ing solution for direct-driven wind turbine generators. The novel transverse flux generator investigated in this work would allow a better utilization of the available nacelle space due to its more compact construction. The major part of the thesis deals with the finite element analysis and an-alytical calculations of transverse flux generators.


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Technical characteristics of a novel helical-groove traveling-wave tube structure Download PDF EPUB FB2

Technical Characteristics of a Novel Helical-Groove Traveling-Wave Tube Structure. Thomas M. Wallett, Karl R. Vaden, and Jon Freeman Lewis Research Center, Cleveland, Ohio A.

Haq Qureshi Cleveland State University, Cleveland, Ohio National Aeronautics and Space Administration Lewis Research Center. Technical Characteristics of a Novel Helical-Groove Traveling-Wave Tube Structure Thomas M.

Wallett, Karl R. Vaden, and Jon Freeman NASA Lewis. Get this from a library. Technical characteristics of a novel helical-groove traveling-wave tube structure. [Thomas M Wallett; Lewis Research Center.;]. The Traveling Wave Tube (twt) is a high-gain, low-noise, wide-bandwidth microwave amplifier.

It is capable of gains greater than 40 dB with bandwidths exceeding an octave. (A bandwidth of 1 octave is one in which the upper frequency is twice the lower frequency.) Traveling-wave tubesFile Size: KB. A novel slotted helix slow-wave structure (SWS) is proposed to develop high power, wide-bandwidth, high reliability millimeter-wave traveling-wave tube (TWT).

This structure, which can improve the heat dissipation capability of the helix SWS, evolves from conventional helix SWS with three parallel rows of rectangular slots made in the outside of the helix.

A novel double-ridge loaded folded waveguide (FWG) traveling-wave tube (TWT) amplifier for sheet electron beam working at GHz is proposed in this paper.

The dispersion relation and interaction impedance characteristics have been analyzed based on. The output characteristics (frequency dependences of the output power and gain factor) of high-power traveling wave tubes based on helical slow-wave structures for operation in the C and Ku wave.

A numerical simulator of the interaction processes in helical traveling-wave tubes is developed on the basis of the method of large particles in the 1D app The output characteristics (frequency dependences of the output power and gain factor) of high-power traveling wave tubes based on helical slow-wave structures for operation in the C and Ku wave bands Cited by: 3.

Abstract: Helical antennas have been a popular antenna configuration for various applications for its simple structure. This work describes the study on a novel, custom-shaped dielectric loaded helical antenna incorporated on an advanced material, which is Barium Strontium Titanate (BST).

Properties of traveling wave-beam interaction in a centered dielectric-rod loaded, arbitrarily-shaped helical groove slow-wave structure (SWS) are investigated for a thin annular electron beam.

The “hot” dispersion equation is obtained by means of the self-consistent field theory, and the small signal analysis is carried out including the effects of the dielectric-rod parameters and the groove by: 3. A dielectric-loaded, ridged helical groove slow-wave structure for the millimeter wave traveling wave tube is presented in this paper.

The effects of the groove depth, ridge dimensions and the dielectric permitivety on the wave propagating properties and the interaction impedance are investigated in by: 2. Helical groove geometry has important influence on the performance of end mills.

It is the hardest and most time-consuming grinding process in end mill manufacture. This paper reports a graphical analysis method to obtain the structure parameters and geometric shapes of helical grooves with the known wheel geometry and position.

For the PH-SEC, dispersion characteristics for several practical modifications to the basic structure have been examined. These modifications comprise a vacuum tunnel, metal shield and multilayer dielectric substrates. The helix is heated by the RF power (10 watt), which is dissipated because of surface resistivity and the beam current intercepted by the helix near output (6 watt for helix current 1 mA).

Heat load of 10 W on the helix circuit is estimated through SUNRAY-1D LSM model 5 and the loss profile shows in by: 1. Theoretical simulation of the dispersion and interaction impedance characteristics of an inhomogeneously-loaded helical slow-wave structure is validated.

The structure is supported by double-curve-shaped rods which are smoothed out into a number of dielectric tubes with their respective effective permittivity by: 1.

Thus, the development of a simple approach to the analysis of the interaction structure of vane-loaded gyro-TWT has been identified as a problem of practical relevance. Citation: G. Singh, "Analytical Study of the Interaction Structure of Vane-Loaded Gyro-Traveling Wave Tube Amplifier," Progress In Electromagnetics Research B, Vol.

4,  Atomically smooth, single crystalline (Bi1−xSbx)2Te3 films have been grown on SrTiO3() substrates by molecular beam epitaxy. A full range of Sb-Bi compositions have been studied in order to obta Cited by: Novel type of amplitude spiral wave in a two-layer system Article (PDF Available) in Chaos (Woodbury, N.Y.) 20(4) December with 54 Reads How we measure 'reads'.

Development of a Novel Pole Using Spun-Cast Concrete Inside Glass-Fiber-Reinforced Polymer Tubes. a hollow GFRP tube that failed prematurely by local buckling and a completely filled GFRP tube that was greater in strength but heavier than the hollow tube. The feasibility of fabrication as well as the equivalent steel reinforcement required Cited by: 4.

ampere-turns the torque characteristics deviate ever more from a linear rise. The reasons for this are flux leakage and saturat ion, which also affect unfavourably the torque wav eform. A variation of the rotor tooth length is presented in Fig, w h erby t o alq uis c d v complete electrical angle.

The ampere-turns is A and. Annular Ring Antenna on a Novel PBG Structure Shatabdi Chakraborty Deptt. of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi, India Manoj KumarVishwakarma Deptt. of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Ranchi, India Shweta Srivastava Deptt.

of Electronics and.For a steel plate (or tube) of a certain thickness, there are frequencies of two or more guided wave mode at each frequency point, and the number of modes of guided wave also increases rapidly as the frequency increases.

The phenomenon is called multi-modal phenomenon of guided wave. Multi-mode characteristics of guided wave cause aAuthor: Songsong Li, Xiaoming Chen, Wenqi Wu.A novel high mobility transparent conductive oxide thin film, tungsten-doped indium oxide (IWO), has been successfully grown on conventional glass substrates by reactive direct current magnetron sputtering technique from a metallic by: