Calibration of the ORNL two-dimensional Thomson scattering system
A unified presentation of the calibrations needed for accurate calculation of electron temperature and density from Thomson scattering data for the Oak Ridge National Laboratory two-dimensional Thomson scattering system (SCATPAK II) is made. Techniques are described for measuring the range of wavelengths to which each channel is responsive. A statistical method for calibrating the gain of each channel in the system is given, and methods of checking for internal consistency and accuracy are presented. The relationship between the constants describing the relative light collection efficiency of each channel and plasma light-scattering theory is developed, methods for measuring the channel efficiencies and evaluating their accuracy are described, and the effect on these constants of bending fiber optics is discussed. The use of Rayleigh or Raman scattering for absolute efficiency (density) calibration, stray light measurement, and system efficiency evaluation is discussed; the relative merits of Rayleigh vs Raman scattering are presented; and the relationship among the Rayleigh/Raman calibrations, relative channel efficiency constants, and absolute efficiencies is developed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5086887
- Report Number(s):
- ORNL/TM-9507; ON: DE86002556
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLASMA DIAGNOSTICS
THOMSON SCATTERING
ACCURACY
CALIBRATION
ELECTRON DENSITY
ELECTRON TEMPERATURE
LASER RADIATION
RAMAN EFFECT
RAYLEIGH SCATTERING
COHERENT SCATTERING
ELECTROMAGNETIC RADIATION
INELASTIC SCATTERING
RADIATIONS
SCATTERING
700102* - Fusion Energy- Plasma Research- Diagnostics