Remote Temperature Sensing for Scanning Auger Microphobe 

Authors:  A.M. Lewis, C.H. Skinner

Abstract:  Liquid lithium is being studied for potential application as a plasma-facing material in tokamaks. This research focuses on an experiment designed to study the temperature dependence of lithium wetting, a process that is important for the application of lithium on tokamak walls. This paper describes the calibration of the infrared pyrometer that will be used in a scanning Auger microprobe to measure the temperature of the lithium sample. An effective emissivity value was used to correct for factors, other than temperature, that affected the pyrometer reading. The ZnSe lens and vacuum viewport were found to significantly decrease the effective emissivity, as did colder objects in the field of view. The field of view of the pyrometer was measured to be 0.6 cm in diameter, and the effective emissivity was found to decrease slightly as the scanning Auger microprobe sample holder temperature increased.
_________________________________________________________________________________________________

Download PPPL-5268 (pdf 4.5 MB 42 pp)
_________________________________________________________________________________________________