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Title: The upgrade of the Thomson scattering system for measurement on the C-2/C-2U devices

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.

Authors:
; ; ; ;  [1]
  1. Tri Alpha Energy, Inc., P.O. Box 7010, Rancho Santa Margarita, California 92688 (United States)
Publication Date:
OSTI Identifier:
22596635
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 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

Citation Formats

Zhai, K., Schindler, T., Kinley, J., Deng, B., and Thompson, M. C. The upgrade of the Thomson scattering system for measurement on the C-2/C-2U devices. United States: N. p., 2016. Web. doi:10.1063/1.4955496.
Zhai, K., Schindler, T., Kinley, J., Deng, B., & Thompson, M. C. The upgrade of the Thomson scattering system for measurement on the C-2/C-2U devices. United States. doi:10.1063/1.4955496.
Zhai, K., Schindler, T., Kinley, J., Deng, B., and Thompson, M. C. Tue . "The upgrade of the Thomson scattering system for measurement on the C-2/C-2U devices". United States. doi:10.1063/1.4955496.
@article{osti_22596635,
title = {The upgrade of the Thomson scattering system for measurement on the C-2/C-2U devices},
author = {Zhai, K. and Schindler, T. and Kinley, J. and Deng, B. and Thompson, M. C.},
abstractNote = {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.},
doi = {10.1063/1.4955496},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {11}
}