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  • Gyrotron  (2)
  • millimeter wave window  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Thermal Modelling of Edge-Cooled Single Disc Gyrotron Windows Using a One-Dimensional Finite Difference Computer Code (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 1451-1469 
    Details
    ISSN: 1572-9559
    Schlagwort(e): Gyrotron ; output window ; CVD diamond ; thermal analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A one - dimensional finite - difference computer code has been developed and shown to be quite effective in thermal design and analysis of various plane edge-cooled single - disc windows for gyrotrons with Gaussian rf beam output. The program has a modular structure and is flexible enough to suit specific requirements of users; it can handle nonlinearity. Results obtained for various CVD diamond window cases compare well with the experiment and with the results obtained using ABACUS, a well-established 3-D Finite Element code. Results indicate that a CVD diamond disc with 94 mm diameter and edge cooled by water at 293 K will ensure the passage of 1 MW CW at 140 GHz. A fused quartz window, with 60 mm diamter and operating at 165 GHZ on a 1.5 MW pulsed coaxial gyrotron has also been analysed for its transient characteristics and results are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1022698807815
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): electromagnetic-thermal-stress modelling ; silicon nitride ; millimeter wave window ; gyrotron
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006619417276
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  • 3
    Digitale Medien
    Digitale Medien
    Self consistent code for a 150 GHz gyrotron (1986)
    Springer
    International journal of infrared and millimeter waves 7 (1986), S. 1863-1879 
    Details
    ISSN: 1572-9559
    Schlagwort(e): Gyrotron ; nonlinear theory ; millimeter radiation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A self consistent calculation for gyrotron oscillators is described and applied to a TE03 mode gyromonotron. The RF field profile satisfies a wave equation in which the AC beam current appears as a source. The wave equation is solved simultaneously with the electron equation of motion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01011993
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