Broadband measurements of electron cyclotron emission in TFTR (Tokamak Fusion Test Reactor) using a quasi-optical light collection system and a polarizing Michelson interferometer

Technical Report · Fri Apr 01 04:00:00 EST 1988

DOI:https://doi.org/10.2172/5093583· OSTI ID:5093583

Stauffer, F J; Boyd, D A; Cutler, R C; Diesso, M; McCarthy, M P; Montague, J; Rocco, R

For the past three years, a Fourier transform spectrometer diagnostic system, employing a fast-scanning polarizing Michelson interferometer, has been operating on the TFTR tokamak at Princeton Plasma Physics Laboratory. It is used to measure the electron cyclotron emission spectrum over the range 2.5 to 18 cm/sup /minus/1/ (75-540 GHz) with a resolution of 0.123 cm/sup /minus/1/(3.7 GHz), at a rate of 72 spectra per second. The quasi-optical system for collecting the light and transporting it through the interferometer to the detector has been designed using the concepts of both Gaussian and geometrical optics in order to produce a system that is efficient over the entire spectral range. The commerical Michelson interferometer was custom-made for this project and is at the state of the art for this type of specialized instrument. Various pre-installation and post-installation tests of the optical system and the interferometer were performed and are reported here. An error propagation analysis of the absolute calibration process is given. Examples of electron cyclotron emission spectra measured in two polarization directions are given, and electron temperature profiles derived from each of them are compared. 34 refs., 17 figs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5093583
• Report Number(s): PPPL-2508; ON: DE88009344
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CALIBRATION
CYCLOTRON RESONANCE
DATA ACQUISITION SYSTEMS
DATA ANALYSIS
DATA PROCESSING
DETECTION
ELECTRON CYCLOTRON-RESONANCE
ELECTRON SPECTRA
ELECTRON TEMPERATURE
INTERFEROMETERS
MEASURING INSTRUMENTS
MICHELSON INTERFEROMETER
OPTICAL SYSTEMS
PLASMA DIAGNOSTICS
PROCESSING
RESONANCE
SIGNAL CONDITIONING
SPECTRA
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS