0. 4 mm interferometer system using dielectric waveguide Page: 2 of 11
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A 0.4 mm INTERFEROMETER SYSTEM USING DIELECTRIC WAVEGUIDE
D. P. Hutchinson, C. H. Ma,
P. A. Staats, and K. L, Vander Sluis
Physics Division, Oak Ridge National Laboratory*
Oak Ridge, Tennessee 37830 USA
A 0.4 mm submillimeter-wave, phase-modulated polarimeter/ interferometer is
used for simultaneous time-dependent measurement of line-averaged electron density
and poloidal field-induced Faraday rotation along chords of the plasma column in
ISX-B tokamak. Heterodyne detection and hollow dielectric waveguide are utilized
to achieve the high sensitivity required for the multichord experiment.
The radial distribution of the toroidal plasma current in tokamak is of prime
importance for understanding fundamental problems (e.g., transport phenomena, MKD
instability, and plasma pressure effects). Various methods for measuring the
distribution have been tried (1-12); however, none are used as a routine method.
Theoretical analyses have shown that the distribution can be obtained indirectly
by measurement of the poloidal magnetic field which can be determined by projecting
linearly polarized farinfrared (FIR) laser beams through the plasma and measuring
the Faraday rotation of the polarization (13-15). Since the rotation angle of the
polarization vector is proportional to the line integral of electron density times
the poloidal magnetic field along the path, the electron density profile must also
be measured simultaneously in order to unfold the current distribution. During
the last decade, the FIR interferometers have been used to reliat'y measure elec-
tron density of tokamak plasmas (16-19). To our knowledge, simultaneous measure-
ment of Faraday rotation and electron line density using submillimeter wave has
*Work sponsored by the Division of Magnetic Fusion Energy, U.S. Department of
Energy, under contract W-7405-eng-26 with the Union Carbide Corporation.
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Hutchinson, D. P.; Ma, C. H.; Staats, P. A. & Vander Sluis, K. L. 0. 4 mm interferometer system using dielectric waveguide, article, January 1, 1982; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1087095/m1/2/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.