Y. Gorelov, J. Lohr, P. Borchard, R. Callis, D. Ponce
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Characteristics of diamond windows on the 1 MW, 110 GHz gyrotron systems on the DIII-D tokamak
Diamond disks made using the chemical vapor deposition (CVD) technique are now in common use as gyrotron output windows. The low millimeter wave losses and excellent thermal conductivity of diamond have made it possible to use such windows in gyrotrons with /spl sim/1 MW output power and pulse length up to and greater than 10 s. A ubiquitous characteristic of diamond gyrotron windows is the presence of apparent hot spots in the infrared images registered during RF pulses. Many of these spots are co-located with bright points seen in visible video images. The spots do not seem to compromise the integrity of the windows. Analysis of the infrared observations on several different gyrotrons operating at the DIII-D Tokamak are reported.
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