Thumbnail
Access Restriction
Open

Author Zhai, K. ♦ Schindler, T. ♦ Kinley, J. ♦ Deng, B. ♦ Thompson, M. C.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ♦ PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ALGORITHMS ♦ ARGON ♦ CALIBRATION ♦ COMPARATIVE EVALUATIONS ♦ DATA ANALYSIS ♦ DENSITY ♦ ELECTRON DENSITY ♦ ELECTRON TEMPERATURE ♦ ELECTRONS ♦ MAXIMUM-LIKELIHOOD FIT ♦ NOISE ♦ PHOTOMULTIPLIERS ♦ RAYLEIGH SCATTERING ♦ SIGNALS ♦ SURFACES ♦ THOMSON SCATTERING
Abstract The C-2/C-2U Thomson scattering system has been substantially upgraded during the latter phase of C-2/C-2U program. A Rayleigh channel has been added to each of the three polychromators of the C-2/C-2U Thomson scattering system. Onsite spectral calibration has been applied to avoid the issue of different channel responses at different spots on the photomultiplier tube surface. With the added Rayleigh channel, the absolute intensity response of the system is calibrated with Rayleigh scattering in argon gas from 0.1 to 4 Torr, where the Rayleigh scattering signal is comparable to the Thomson scattering signal at electron densities from 1 × 10{sup 13} to 4 × 10{sup 14} cm{sup −3}. A new signal processing algorithm, using a maximum likelihood method and including detailed analysis of different noise contributions within the system, has been developed to obtain electron temperature and density profiles. The system setup, spectral and intensity calibration procedure and its outcome, data analysis, and the results of electron temperature/density profile measurements will be presented.
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-11-15
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 87
Issue Number 11


Open content in new tab

   Open content in new tab