Abstract
During the past five years, the measurement of electron cyclotron emission (ECE) from tokamaks has developed from the initial efforts into a diagnostic of generally recognized importance. Fourier transform spectrometers (FTS) incorporating the fast-scanning Martin-Puplett interferometer are widely used to make these measurements. Spectral scans of the second harmonic line in the ECE spectrum that are made with this instrument lead straightforwardly to the determination of the shape of the electron temperature profile. The determination of the profile shape involves a relative spectral calibration of the instrument that is made by measuring the spectrum of a known broadband calibration source. Achieving an absolute calibration is more difficult. Usually, the necessary multiplicative factor for converting the measured relative profile into absolute values of electron temperature has been obtained by normalizing the profiles to those that are obtained with a Thomson scattering electron temperature diagnostic. However, it would be more satisfactory if the instrument could be absolutely calibrated by a means that is independent of any other plasma diagnostic. This paper reports the preliminary results that have been obtained in an effort to absolutely calibrate the FTS system that is being operated by the University of Maryland group on the PLT tokamak at Princeton Plasma Physics Laboratory.
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