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Author(s):
T. Shimozuma, S. Morimoto, M. Sato, Y. Takita, S. Ito, S. Kubo, H. Idei, K. Ohkubo and T. Watari
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Title:
A Forced Gas-Cooled Single-Disk Window Using Silicon Nitride Composite for High Power CW Millimeter Waves
Date of publication:
Oct. 1997
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Key words:
gyrotron, vacuum barrier window, silicon nitride, gas-cooling, electron cyclotron heating
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Abstract:
Silicon nitride composite as a candidate of a window material for high power CW (Continuous Wave) millimeter-waves was high power tested especially with a surface cooling by impinging gas nitrogen jets on the single-disk surface. Gas-cooling dramatically suppressed the temperature of the window disk even with gas flow rate of around 100 l/min. With gas cooling of 4651/min., 130kW CW power of HE_11 mode could be transmitted through the silicon nitride window with a diameter of 88.9mm. The peak window temperature was completely saturated on 123.6 degree C. Without gas-cooling it did not saturate and reached 323 degree C during 30 seconds pulse. A possibility of 1MW CW single disk Brewster windows with a forced gas-cooling is discussed, resulting in convinced prospects of the windows with realistic size and thickness.
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