Application of diamond window for infrared laser diagnostics in a tokamak device

Abstract

Chemical vapor deposited diamond disks have been successfully applied as the vacuum windows for infrared CO2 laser interferometry and polarimetry used in electron density measurement in the JT-60U tokamak. In comparison with the conventional zinc–selenide windows, the Faraday rotation component of diamond windows was negligible. This results in an improvement of the Faraday rotation measurement of tokamak plasma by polarimetry.