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  • 1
    Electronic Resource
    Electronic Resource
    High efficiency cavity design of a 170 GHz gyrotron for fusion applications (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 209-216 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The design of high power, continuous wave (cw), 170 GHz gyrotron cavities is considered. The anticipated degradation of efficiency with beam velocity spread places a premium on the optimization of efficiency. For parameters of interest achievement of high efficiency requires utilization of a high quality cavity. Two options are considered: a barrel cavity and a long simple tapered cavity operating at low voltage. The cavities are examined for their sensitivity to velocity spread, their mode competition, and their maximum Ohmic power dissipation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872133
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  • 2
    Electronic Resource
    Electronic Resource
    Cold tests of open coaxial resonators in the range 9–17 GHz (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 383-395 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of selective properties of coaxial open cylindrical resonators have been conducted experimentally and compared with theory. The resonator consists of an inner circular cylinder symmetrically located inside an outer weakly irregular open waveguide. Several fundamental TE modes were identified over the range 9 to 17 GHz through measurements of the resonant frequencies and the associated loaded quality factors. It has been verified that the structure and the number of resonant modes are both strongly dependent on the diameter of the coaxial insert. Such an electrodynamical system proves to be useful in guided wave applications requiring, for example, filters, frequency-tunable resonators and devices for analyzing the modal composition of a signal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02282080
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  • 3
    Electronic Resource
    Electronic Resource
    Ohmic selection in open coaxial resonators: An experimental study (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 2191-2201 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of ohmic selective properties of open coaxial cylindrical resonators has been conducted experimentally and compared with theory. The resonator consists of an inner cylinder made of silicon carbide symmetrically located inside an outer cylindrical, tube shaped waveguide. Several fundamental TE modes were identified over the range 9 to 17 GHz through measurements of the resonant frequencies and the associated quality factors. Mode discrimination is achieved both by exploring selective ohmic effects and examining the electrodynamical properties of the coaxial cylindrical waveguide. The effectiveness of a silicon carbide coaxial insert in providing ohmic mode selection is demonstrated in that the totalQ factors of TE mp modes with radial indexp≥2 become well below the quality factors for surface TE m1 modes. It has been verified that both structure and number of resonant modes are strongly dependent on the diameter and the resistivity of the coaxial insert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096381
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  • 4
    Electronic Resource
    Electronic Resource
    Coaxial resonator for a megawatt 280 GHz gyrotron (1991)
    Springer
    International journal of infrared and millimeter waves 12 (1991), S. 717-728 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To provide the required mode selectivity for a megawatt 280 GHz gyrotron, a coaxial resonator operating in a high order TE mode is considered. Mode discrimination is achieved both by exploring the differences in the transverse structures of the competing modes and investigating a suitable geometry for the coaxial insert. For modes with close eigenfrequencies the associated diffractionQ factors can be widely different in value, thereby ensuring an effective mode selection. In the resonator studied here, the frequency separation between the design mode TE26,10,1 and its nearest competing mode TE20,12,1 is about 0.6% and the ratio of the correspondingQ factors is as high as 6.5. Unlike the coaxial resonator, in the hollow cavity without the inner conductor the fundamental spectrum of eigenfrequencies is more dense, and all TE modes within the frequency interval 271–288 GHz have approximately the sameQ factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008901
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  • 5
    Electronic Resource
    Electronic Resource
    Cold tests of A 10-GHz gyrotron cavity (1992)
    Springer
    International journal of infrared and millimeter waves 13 (1992), S. 91-104 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experiments have been conducted to characterize a gyrotron cavity designed to operate in theTE 021 mode at 10 GHz. Cavity excitation was accomplished via a coupling hole introduced into the cavity wall and mode detection was carried out by means of two experimental arrangements. In the first, electromagnetic energy is coupled into a receiving waveguide through a small second hole drilled in the opposite side of the cavity. The other scheme uses a horn antenna to receive the power reradiated by the open resonator. Both schemes are discussed regarding mode detection, and measured data includes resonant frequency, loadedQ factor, axial electric field profile and farfield radiation pattern. Evaluation of the loadedQ factor is based on bandwidth measurements whereas standing-wave electric field profile is determined by using perturbation techniques. For severalTE modes, close agreeent between theory and experiment is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011210
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  • 6
    Electronic Resource
    Electronic Resource
    Design of a TE42,7 coaxial cavity for a 1 MW, 280 GHz gyrotron (1992)
    Springer
    International journal of infrared and millimeter waves 13 (1992), S. 443-455 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To provide the required mode selectivity for a 1 MW, 280 GHz gyrotron, a coaxial resonator operating in the high order TE42,7 mode is considered. Mode discrimination is achieved both by exploring selective ohmic effects and examining the electrodynamic properties of the coaxial cylindrical waveguide. Analytic results indicate the effectiveness of a coaxial insert with a low electrical conductivity in rarefying the mode density of overmoded, megawatt hollow cavities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010704
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  • 7
    Electronic Resource
    Electronic Resource
    Design of a 35 GHz gyrotron (1990)
    Springer
    International journal of infrared and millimeter waves 11 (1990), S. 251-274 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conceptual design of a 35 GHz gyrotron has been developed consistently with the complex formulation of the electric field longitudinal distribution in the resonant cavity. Some models of magnetron injection guns able to produce laminar beams have been investigated leading to the design of an electron gun capable of generating a current of 5 A with a perpendicular velocity dispersion of 0.5%. The device includes three magnetic systems producting flat axial magnetic induction profiles of 1.05 kG, 13.2 kG and 0.65 kG in the cathode, cavity and collector regions, respectively. The gyrotron has been designed for pulsed operation in the TE021 mode. Under the soft self-excitation condition, the maximum attainable efficiency is 40% with an output power of 100 kW. An analysis of the collector thermal behaviour has been carried out as well as a study of the thermophysical properties of the alumina window to be used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010519
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  • 8
    Electronic Resource
    Electronic Resource
    Resonance in open coaxial cylindrical resonators (1996)
    Springer
    International journal of infrared and millimeter waves 17 (1996), S. 921-932 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of the electrodynamical properties of open coaxial cylindrical resonators using a partially conical inner rod is made along with experimental verification. On the basis of a geometrical criterion for the occurrence of high-Q resonances, it turns out to be possible to discriminate certain classes of TE modes by keeping to a minimum value their diffrationQ factors. In particular, for an especially designed cavity only TE0.2 and TE1.3 modes appear to have strong resonance in the 6 · 14GH z range as a result of the action of the coaxial insert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101400
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  • 9
    Electronic Resource
    Electronic Resource
    Electromagnetic Field and Cutoff Frequencies of the Azimuthally Rippled Wall Waveguide (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 1019-1029 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The cylindrical waveguide with azimuthally periodic corrugations described by a sinusoidal function is analyzed. Relevant to magnetron and gyrotron interactions, TE-mode oscillations are treated by deriving a dispersion relation—linking the cut-off frequency and corrugation parameters—upon expansion of the field quantities in terms of space harmonics. From numerical examples, the present paper examines how the geometrical properties (area and perimeter) of the corrugated cross section relates with the cutoff frequencies of 2π and π modes having one radial variation. The waveguiding system studied here with continuously corrugated azimuthal profile looks attractive to relativistic, slow-wave electron devices for it is more resistant to RF breakdown in comparison with traditional magnetron cavities with vane-type side resonators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026466122245
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