Broadband measurement of electron cyclotron emission in TFTR using a quasioptical light collection system and a polarizing Michelson interferometer

Journal Article · Sat Oct 01 04:00:00 EDT 1988 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1139976· OSTI ID:7030550

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

For the past four years, a Fourier transform spectrometer diagnostic system, employing a fast-scanning polarizing Michelson interferometer (FMI), has been operating on the TFTR tokamak at the Princeton Plasma Physics Laboratory. It is used to measure the electron cyclotron emission (ECE) spectrum over the range 2.5--18 cm/sup -1/ (75--540 GHz), with a resolution of 0.123 cm/sup -1/ (3.7 GHz), at a rate of 72 spectra per second. The quasioptical 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. The commercial FMI was custom made for this project and is the state of the art for this type of specialized instrument. The diagnostic system is described and an error propagation analysis of the absolute calibration process is given. Examples of ECE spectra measured in two polarization directions are given and electron temperature profiles derived from each of them are compared.

• Research Organization: Laboratory for Plasma and Fusion Energy Studies, University of Maryland, College Park, Maryland 20742
• OSTI ID: 7030550
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 59:10; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
CYCLOTRON RESONANCE
DESIGN
ELECTRON CYCLOTRON-RESONANCE
INFRARED SPECTROMETERS
INTERFEROMETERS
MEASURING INSTRUMENTS
MICHELSON INTERFEROMETER
OPERATION
OPTICAL SYSTEMS
PERFORMANCE
PLASMA DIAGNOSTICS
POLARIZATION
RESONANCE
SPECTROMETERS
TFTR TOKAMAK
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS