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
