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  • 1
    Electronic Resource
    Electronic Resource
    Thermo-Mechanical Analysis of Single-Disc Edge-Cooled Silicon Nitride Millimeter Wave Window for 200 kW CW Gyrotrons (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 485-504 
    Details
    ISSN: 1572-9559
    Keywords: electromagnetic-thermal-stress modelling ; silicon nitride ; millimeter wave window ; gyrotron
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper investigates the possibility of using Silicon Nitride Composite (Kyocera SN-287) as single-disc, edge-cooled window for gyrotrons operating below 200 kW CW in the frequency range 28-42 GHz. Rotationally symmetric TE0n, and TEM00 Gaussian modes of rf transmission through the window have been considered. Analysis performed using a one dimensional (1D) finite difference (FD) code reveals that thermal stresses developed due to non-uniform temperature distribution on the disc surface are well within manageable limits for a 200 kW 42 GHz gyrotron proposed for some ECRH applications. For industrial gyrotrons, for microwave material processing and operating at a maximum power level of 100 kW CW, Si3N4 windows may be a cost effective replacement for sapphire windows. It is found that a TE02 profile results in lower peak temperature at the window disc in comparison to a Gaussian beam profile and allows the use of smaller discs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006619417276
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  • 2
    Electronic Resource
    Electronic Resource
    Waveguide Cross Section and Background Magnetic Field Tapers for Broadbanding a Gyro-TWT (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 1255-1267 
    Details
    ISSN: 1572-9559
    Keywords: microwave tube ; gyrotron ; cyclotron resonance maser ; traveling-wave tube ; broadbanding ; high-power millimeter-wave amplifier
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gyro-TWT in a cylindrical waveguide of linearly-tapered cross section was analyzed for the gain-frequency response, using the Pierce-type gain equation. The taper in the waveguide cross section was adjusted for wide device bandwidths, either by changing the taper angle, while keeping the interaction length to be constant, or by changing the interaction length, while keeping the initial and final radii of the waveguide constant. Tapering led to the prediction of wide bandwidths, though at the cost of gain, as compared to a non-tapered device. The range of the DC background magnetic flux density relative to its grazing-point value was identified as a crucial parameter for large gains, with appreciable bandwidths, and minimum mode mixing in a tapered device, the latter in general facing more mode competition than a non-tapered device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026448000149
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